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rfc:rfc1392

Network Working Group G. Malkin Request for Comments: 1392 Xylogics, Inc. FYI: 18 T. LaQuey Parker

                                                                UTexas
                                                               Editors
                                                          January 1993
                      Internet Users' Glossary

Status of this Memo

 This memo provides information for the Internet community.  It does
 not specify an Internet standard.  Distribution of this memo is
 unlimited.

Abstract

 There are many networking glossaries in existence.  This glossary
 concentrates on terms which are specific to the Internet.  Naturally,
 there are entries for some basic terms and acronyms because other
 entries refer to them.

Acknowledgements

 This document is the work of the User Glossary Working Group of the
 User Services Area of the Internet Engineering Task Force (IETF).
 Special thanks go to Jon Postel for his definitive definition of
 "datagram".

Table of Contents

 non-letter  . .  2      I . . . . . . . 23      R . . . . . . . 40
 A . . . . . . .  2      J . . . . . . . 29      S . . . . . . . 43
 B . . . . . . .  6      K . . . . . . . 29      T . . . . . . . 45
 C . . . . . . .  9      L . . . . . . . 29      U . . . . . . . 48
 D . . . . . . . 12      M . . . . . . . 30      V . . . . . . . 49
 E . . . . . . . 16      N . . . . . . . 33      W . . . . . . . 49
 F . . . . . . . 18      O . . . . . . . 36      X . . . . . . . 50
 G . . . . . . . 20      P . . . . . . . 37      Y . . . . . . . 51
 H . . . . . . . 21      Q . . . . . . . 40      Z . . . . . . . 51
 References  . . . . . . . . . . . . . . . . . . . . . . . . . . 52
 Security Considerations . . . . . . . . . . . . . . . . . . . . 53
 Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . 53

User Glossary Working Group [Page 1] RFC 1392 Internet Glossary January 1993

Glossary

 10BaseT
    A variant of Ethernet which allows stations to be attached via
    twisted pair cable.  See also: Ethernet, twisted pair.
 802.x
    The set of IEEE standards for the definition of LAN protocols.
    See also: IEEE.
 822
    See: RFC 822
 :-)
    This odd symbol is one of the ways a person can portray "mood" in
    the very flat medium of computers--by using "smiley faces".  This
    is "metacommunication", and there are literally hundreds of such
    symbols, from the obvious to the obscure.  This particular example
    expresses "happiness".  Don't see it?  Tilt your head to the left
    90 degrees.  Smiles are also used to denote sarcasm.
    [Source: ZEN]
 abstract syntax
    A description of a data structure that is independent of machine-
    oriented structures and encodings.
    [Source: RFC1208]
 Abstract Syntax Notation One (ASN.1)
    The language used by the OSI protocols for describing abstract
    syntax.  This language is also used to encode SNMP packets.  ASN.1
    is defined in ISO documents 8824.2 and 8825.2.  See also: Basic
    Encoding Rules.
 Acceptable Use Policy (AUP)
    Many transit networks have policies which restrict the use to
    which the network may be put.  A well known example is NSFNET's
    AUP which does not allow commercial use.  Enforcement of AUPs
    varies with the network.  See also: National Science Foundation.
 Access Control List (ACL)
    Most network security systems operate by allowing selective use of
    services.  An Access Control List is the usual means by which
    access to, and denial of, services is controlled.  It is simply a
    list of the services available, each with a list of the hosts
    permitted to use the service.
 ACK
    See: Acknowledgment

User Glossary Working Group [Page 2] RFC 1392 Internet Glossary January 1993

 acknowledgment (ACK)
    A type of message sent to indicate that a block of data arrived at
    its destination without error.  See also: Negative
    Acknowledgement.
    [Source: NNSC]
 ACL
    See: Access Control List
 AD
    See: Administrative Domain
 address
    There are three types of addresses in common use within the
    Internet.  They are email address; IP, internet or Internet
    address; and hardware or MAC address.  See also: email address, IP
    address, internet address, MAC address.
 address mask
    A bit mask used to identify which bits in an IP address correspond
    to the network and subnet portions of the address.  This mask is
    often referred to as the subnet mask because the network portion
    of the address can be determined by the encoding inherent in an IP
    address.
 address resolution
    Conversion of an internet address into the corresponding physical
    address.
 Address Resolution Protocol (ARP)
    Used to dynamically discover the low level physical network
    hardware address that corresponds to the high level IP address for
    a given host.  ARP is limited to physical network systems that
    support broadcast packets that can be heard by all hosts on the
    network.  It is defined in RFC 826.  See also: proxy ARP.
 Administrative Domain (AD)
    A collection of hosts and routers, and the interconnecting
    network(s), managed by a single administrative authority.
 Advanced Research Projects Agency Network (ARPANET)
    A pioneering longhaul network funded by ARPA (now DARPA).  It
    served as the basis for early networking research, as well as a
    central backbone during the development of the Internet.  The
    ARPANET consisted of individual packet switching computers
    interconnected by leased lines.  See also: Defense Advanced
    Research Projects Agency.
    [Source: FYI4]

User Glossary Working Group [Page 3] RFC 1392 Internet Glossary January 1993

 agent
    In the client-server model, the part of the system that performs
    information preparation and exchange on behalf of a client or
    server application.
    [Source: RFC1208]
 alias
    A name, usually short and easy to remember, that is translated
    into another name, usually long and difficult to remember.
 American National Standards Institute (ANSI)
    This organization is responsible for approving U.S. standards in
    many areas, including computers and communications.  Standards
    approved by this organization are often called ANSI standards
    (e.g., ANSI C is the version of the C language approved by ANSI).
    ANSI is a member of ISO.  See also: International Organization for
    Standardization.
    [Source: NNSC]
 American Standard Code for Information Interchange (ASCII)
    A standard character-to-number encoding widely used in the
    computer industry.  See also: EBCDIC.
 anonymous FTP
    Anonymous FTP allows a user to retrieve documents, files,
    programs, and other archived data from anywhere in the Internet
    without having to establish a userid and password.  By using the
    special userid of "anonymous" the network user will bypass local
    security checks and will have access to publicly accessible files
    on the remote system.  See also: archive site, File Transfer
    Protocol.
 ANSI
    See: American National Standards Institute
 API
    See: Application Program Interface
 Appletalk
    A networking protocol developed by Apple Computer for
    communication between Apple Computer products and other computers.
    This protocol is independent of the network layer on which it is
    run.  Current implementations exist for Localtalk, a 235Kb/s local
    area network; and Ethertalk, a 10Mb/s local area network.
    [Source: NNSC]
 application
    A program that performs a function directly for a user.  FTP, mail

User Glossary Working Group [Page 4] RFC 1392 Internet Glossary January 1993

    and Telnet clients are examples of network applications.
 application layer
    The top layer of the network protocol stack.  The application
    layer is concerned with the semantics of work (e.g., formatting
    electronic mail messages).  How to represent that data and how to
    reach the foreign node are issues for lower layers of the network.
    [Source: MALAMUD]
 Application Program Interface (API)
    A set of calling conventions which define how a service is invoked
    through a software package.
    [Source: RFC1208]
 archie
    A system to automatically gather, index and serve information on
    the Internet.  The initial implementation of archie provided an
    indexed directory of filenames from all anonymous FTP archives on
    the Internet.  Later versions provide other collections of
    information.  See also: archive site, Gopher, Prospero, Wide Area
    Information Servers.
 archive site
    A machine that provides access to a collection of files across the
    Internet.  An "anonymous FTP archive site", for example, provides
    access to this material via the FTP protocol.  See also: anonymous
    FTP, archie, Gopher, Prospero, Wide Area Information Servers.
 ARP
    See: Address Resolution Protocol
 ARPA
    See: Defense Advanced Research Projects Agency
 ARPANET
    See: Advanced Research Projects Agency Network
 AS
    See: Autonomous System
 ASCII
    See: American Standard Code for Information Interchange
 ASN.1
    See: Abstract Syntax Notation One
 assigned numbers
    The RFC [STD2] which documents the currently assigned values from

User Glossary Working Group [Page 5] RFC 1392 Internet Glossary January 1993

    several series of numbers used in network protocol
    implementations.  This RFC is updated periodically and, in any
    case, current information can be obtained from the Internet
    Assigned Numbers Authority (IANA).  If you are developing a
    protocol or application that will require the use of a link,
    socket, port, protocol, etc., please contact the IANA to receive a
    number assignment.  See also: Internet Assigned Numbers Authority,
    STD.
    [Source: STD2]
 Asynchronous Transfer Mode (ATM)
    A method for the dynamic allocation of bandwidth using a fixed-
    size packet (called a cell).  ATM is also known as "fast packet".
 ATM
    See: Asynchronous Transfer Mode
 AUP
    See: Acceptable Use Policy
 authentication
    The verification of the identity of a person or process.
    [Source: MALAMUD]
 Autonomous System (AS)
    A collection of routers under a single administrative authority
    using a common Interior Gateway Protocol for routing packets.
 backbone
    The top level in a hierarchical network.  Stub and transit
    networks which connect to the same backbone are guaranteed to be
    interconnected.  See also: stub network, transit network.
 bandwidth
    Technically, the difference, in Hertz (Hz), between the highest
    and lowest frequencies of a transmission channel.  However, as
    typically used, the amount of data that can be sent through a
    given communications circuit.
 bang path
    A series of machine names used to direct electronic mail from one
    user to another, typically by specifying an explicit UUCP path
    through which the mail is to be routed.  See also: email address,
    mail path, UNIX-to-UNIX CoPy.
 baseband
    A transmission medium through which digital signals are sent
    without complicated frequency shifting.  In general, only one

User Glossary Working Group [Page 6] RFC 1392 Internet Glossary January 1993

    communication channel is available at any given time.  Ethernet is
    an example of a baseband network.  See also: broadband, Ethernet.
    [Source: NNSC]
 Basic Encoding Rules (BER)
    Standard rules for encoding data units described in ASN.1.
    Sometimes incorrectly lumped under the term ASN.1, which properly
    refers only to the abstract syntax description language, not the
    encoding technique.  See also: Abstract Syntax Notation One.
    [Source: NNSC]
 BBS
    See: Bulletin Board System
 BCNU
    Be Seein' You
 BER
    See: Basic Encoding Rules
 Berkeley Internet Name Domain (BIND)
    Implementation of a DNS server developed and distributed by the
    University of California at Berkeley.  Many Internet hosts run
    BIND, and it is the ancestor of many commercial BIND
    implementations.
 Berkeley Software Distribution (BSD)
    Implementation of the UNIX operating system and its utilities
    developed and distributed by the University of California at
    Berkeley.  "BSD" is usually preceded by the version number of the
    distribution, e.g., "4.3 BSD" is version 4.3 of the Berkeley UNIX
    distribution.  Many Internet hosts run BSD software, and it is the
    ancestor of many commercial UNIX implementations.
    [Source: NNSC]
 BGP
    See: Border Gateway Protocol
 big-endian
    A format for storage or transmission of binary data in which the
    most significant bit (or byte) comes first.  The term comes from
    "Gulliver's Travels" by Jonathan Swift.  The Lilliputians, being
    very small, had correspondingly small political problems.  The
    Big-Endian and Little-Endian parties debated over whether soft-
    boiled eggs should be opened at the big end or the little end.
    See also: little-endian.
    [Source: RFC1208]

User Glossary Working Group [Page 7] RFC 1392 Internet Glossary January 1993

 binary
    11001001
 BIND
    See: Berkeley Internet Name Domain
 Birds Of a Feather (BOF)
    A Birds Of a Feather (flocking together) is an informal discussion
    group.  It is formed, often ad hoc, to consider a specific issue
    and, therefore, has a narrow focus.
 Bitnet
    An academic computer network that provides interactive electronic
    mail and file transfer services, using a store-and-forward
    protocol, based on IBM Network Job Entry protocols.  Bitnet-II
    encapsulates the Bitnet protocol within IP packets and depends on
    the Internet to route them.
 BOF
    See: Birds Of a Feather
 BOOTP
    The Bootstrap Protocol, described in RFCs 951 and 1084, is used
    for booting diskless nodes.  See also: Reverse Address Resolution
    Protocol.
 Border Gateway Protocol (BGP)
    The Border Gateway Protocol is an exterior gateway protocol
    defined in RFCs 1267 and 1268.  It's design is based on experience
    gained with EGP, as defined in STD 18, RFC 904, and EGP usage in
    the NSFNET Backbone, as described in RFCs 1092 and 1093.  See
    also: Exterior Gateway Protocol.
 bounce
    The return of a piece of mail because of an error in its delivery.
    [Source: ZEN]
 bridge
    A device which forwards traffic between network segments based on
    datalink layer information.  These segments would have a common
    network layer address.  See also: gateway, router.
 broadband
    A transmission medium capable of supporting a wide range of
    frequencies.  It can carry multiple signals by dividing the total
    capacity of the medium into multiple, independent bandwidth
    channels, where each channel operates only on a specific range of
    frequencies.  See also: baseband.

User Glossary Working Group [Page 8] RFC 1392 Internet Glossary January 1993

 broadcast
    A special type of multicast packet which all nodes on the network
    are always willing to receive.  See also: multicast.
 broadcast storm
    An incorrect packet broadcast onto a network that causes multiple
    hosts to respond all at once, typically with equally incorrect
    packets which causes the storm to grow exponentially in severity.
 brouter
    A device which bridges some packets (i.e., forwards based on
    datalink layer information) and routes other packets (i.e.,
    forwards based on network layer information).  The bridge/route
    decision is based on configuration information.  See also: bridge,
    router.
 BSD
    See: Berkeley Software Distribution
 BTW
    By The Way
 Bulletin Board System (BBS)
    A computer, and associated software, which typically provides
    electronic messaging services, archives of files, and any other
    services or activities of interest to the bulletin board system's
    operator.  Although BBS's have traditionally been the domain of
    hobbyists, an increasing number of BBS's are connected directly to
    the Internet, and many BBS's are currently operated by government,
    educational, and research institutions.  See also: Electronic
    Mail, Internet, Usenet.
    [Source: NWNET]
 Campus Wide Information System (CWIS)
    A CWIS makes information and services publicly available on campus
    via kiosks, and makes interactive computing available via kiosks,
    interactive computing systems and campus networks. Services
    routinely include directory information, calendars, bulletin
    boards, databases.
 CCIRN
    See: Coordinating Committee for Intercontinental Research Networks
 CCITT
    See: Comite Consultatif International de Telegraphique et
    Telephonique

User Glossary Working Group [Page 9] RFC 1392 Internet Glossary January 1993

 CERT
    See: Computer Emergency Response Team
 checksum
    A computed value which is dependent upon the contents of a packet.
    This value is sent along with the packet when it is transmitted.
    The receiving system computes a new checksum based upon the
    received data and compares this value with the one sent with the
    packet.  If the two values are the same, the receiver has a high
    degree of confidence that the data was received correctly.
    [Source: NNSC]
 circuit switching
    A communications paradigm in which a dedicated communication path
    is established between two hosts, and on which all packets travel.
    The telephone system is an example of a circuit switched network.
    See also: connection-oriented, connectionless, packet switching.
 client
    A computer system or process that requests a service of another
    computer system or process.  A workstation requesting the contents
    of a file from a file server is a client of the file server.  See
    also: client-server model, server.
    [Source: NNSC]
 client-server model
    A common way to describe the paradigm of many network protocols.
    Examples include the name-server/name-resolver relationship in DNS
    and the file-server/file-client relationship in NFS.  See also:
    client, server, Domain Name System, Network File System.
 CNI
    See: Coalition for Networked Information
 Coalition for Networked Information (CNI)
    A consortium formed by American Research Libraries, CAUSE, and
    EDUCOM to promote the creation of, and access to, information
    resources in networked environments in order to enrich scholarship
    and enhance intellectual productivity.
 Comite Consultatif International de Telegraphique et Telephonique
    (CCITT)
    This organization is part of the United National International
    Telecommunications Union (ITU) and is responsible for making
    technical recommendations about telephone and data communications
    systems.  Every four years CCITT holds plenary sessions where they
    adopt new standards; the most recent was in 1992.
    [Source: NNSC]

User Glossary Working Group [Page 10] RFC 1392 Internet Glossary January 1993

 Computer Emergency Response Team (CERT)
    The CERT was formed by DARPA in November 1988 in response to the
    needs exhibited during the Internet worm incident.  The CERT
    charter is to work with the Internet community to facilitate its
    response to computer security events involving Internet hosts, to
    take proactive steps to raise the community's awareness of
    computer security issues, and to conduct research targeted at
    improving the security of existing systems.  CERT products and
    services include 24-hour technical assistance for responding to
    computer security incidents, product vulnerability assistance,
    technical documents, and tutorials.  In addition, the team
    maintains a number of mailing lists (including one for CERT
    Advisories), and provides an anonymous FTP server, at "cert.org",
    where security-related documents and tools are archived.  The CERT
    may be reached by email at "cert@cert.org" and by telephone at
    +1-412-268-7090 (24-hour hotline).  See also: Defense Advanced
    Research Projects Agency, worm.
 congestion
    Congestion occurs when the offered load exceeds the capacity of a
    data communication path.
 connection-oriented
    The data communication method in which communication proceeds
    through three well-defined phases: connection establishment, data
    transfer, connection release.  TCP is a connection-oriented
    protocol.  See also: circuit switching, connectionless, packet
    switching, Transmission Control Protocol.
 connectionless
    The data communication method in which communication occurs
    between hosts with no previous setup.  Packets between two hosts
    may take different routes, as each is independent of the other.
    UDP is a connectionless protocol.  See also: circuit switching,
    connection-oriented, packet switching, User Datagram Protocol.
 Coordinating Committee for Intercontinental Research Networks (CCIRN)
    A committee that includes the United States FNC and its
    counterparts in North America and Europe.  Co-chaired by the
    executive directors of the FNC and the European Association of
    Research Networks (RARE), the CCIRN provides a forum for
    cooperative planning among the principal North American and
    European research networking bodies.  See also: Federal Networking
    Council, RARE.
    [Source: MALAMUD]
 core gateway
    Historically, one of a set of gateways (routers) operated by the

User Glossary Working Group [Page 11] RFC 1392 Internet Glossary January 1993

    Internet Network Operations Center at Bolt, Beranek and Newman
    (BBN).  The core gateway system formed a central part of Internet
    routing in that all groups must advertise paths to their networks
    from a core gateway.
    [Source: MALAMUD]
 Corporation for Research and Educational Networking (CREN)
    This organization was formed in October 1989, when Bitnet and
    CSNET (Computer + Science NETwork) were combined under one
    administrative authority.  CSNET is no longer operational, but
    CREN still runs Bitnet.  See also: Bitnet.
    [Source: NNSC]
 cracker
    A cracker is an individual who attempts to access computer systems
    without authorization.  These individuals are often malicious, as
    opposed to hackers, and have many means at their disposal for
    breaking into a system.  See also: hacker, Computer Emergency
    Response Team, Trojan Horse, virus, worm.
 CRC
    See: cyclic redundancy check
 CREN
    See: Corporation for Research and Educational Networking
 CWIS
    See: Campus Wide Information system
 Cyberspace
    A term coined by William Gibson in his fantasy novel Neuromancer
    to describe the "world" of computers, and the society that gathers
    around them.
    [Source: ZEN]
 Cyclic Redundancy Check (CRC)
    A number derived from a set of data that will be transmitted.  By
    recalculating the CRC at the remote end and comparing it to the
    value originally transmitted, the receiving node can detect some
    types of transmission errors.
    [Source: MALAMUD]
 DARPA
    See: Defense Advanced Research Projects Agency
 Data Encryption Key (DEK)
    Used for the encryption of message text and for the computation of
    message integrity checks (signatures).  See also: encryption.

User Glossary Working Group [Page 12] RFC 1392 Internet Glossary January 1993

 Data Encryption Standard (DES)
    A popular, standard encryption scheme.  See also: encryption.
 datagram
    A self-contained, independent entity of data carrying sufficient
    information to be routed from the source to the destination
    computer without reliance on earlier exchanges between this source
    and destination computer and the transporting network.  See also:
    frame, packet.
    [Source: J. Postel]
 DCA
    See: Defense Information Systems Agency
 DCE
    Data Circuit-terminating Equipment
 DCE
    See: Distributed Computing Environment
 DDN
    See: Defense Data Network
 DDN NIC
    See: Defense Data Network Network Information Center
 DECnet
    A proprietary network protocol designed by Digital Equipment
    Corporation.  The functionality of each Phase of the
    implementation, such as Phase IV and Phase V, is different.
 default route
    A routing table entry which is used to direct packets addressed to
    networks not explicitly listed in the routing table.
    [Source: MALAMUD]
 Defense Advanced Research Projects Agency (DARPA)
    An agency of the U.S. Department of Defense responsible for the
    development of new technology for use by the military.  DARPA
    (formerly known as ARPA) was responsible for funding much of the
    development of the Internet we know today, including the Berkeley
    version of Unix and TCP/IP.
    [Source: NNSC]
 Defense Data Network (DDN)
    A global communications network serving the US Department of
    Defense composed of MILNET, other portions of the Internet, and
    classified networks which are not part of the Internet.  The DDN

User Glossary Working Group [Page 13] RFC 1392 Internet Glossary January 1993

    is used to connect military installations and is managed by the
    Defense Information Systems Agency.  See also: Defense Information
    Systems Agency.
 Defense Data Network Network Information Center (DDN NIC)
    Often called "The NIC", the DDN NIC's primary responsibility is
    the assignment of Internet network addresses and Autonomous System
    numbers, the administration of the root domain, and providing
    information and support services to the DDN.  It is also a primary
    repository for RFCs.  See also: Autonomous System, network
    address, Internet Registry, Network Information Center, Request
    For Comments.
 Defense Information Systems Agency (DISA)
    Formerly called the Defense Communications Agency (DCA), this is
    the government agency responsible for managing the DDN portion of
    the Internet, including the MILNET.  Currently, DISA administers
    the DDN, and supports the user assistance services of the DDN NIC.
    See also: Defense Data Network.
 DEK
    See: Data Encryption Key
 DES
    See: Data Encryption Standard
 dialup
    A temporary, as opposed to dedicated, connection between machines
    established over a standard phone line.
 Directory Access Protocol
    X.500 protocol used for communication between a Directory User
    Agent and a Directory System Agent.
    [Source: MALAMUD]
 Directory System Agent (DSA)
    The software that provides the X.500 Directory Service for a
    portion of the directory information base.  Generally, each DSA is
    responsible for the directory information for a single
    organization or organizational unit.
    [Source: RFC1208]
 Directory User Agent (DUA)
    The software that accesses the X.500 Directory Service on behalf
    of the directory user.  The directory user may be a person or
    another software element.
    [Source: RFC1208]

User Glossary Working Group [Page 14] RFC 1392 Internet Glossary January 1993

 DISA
    See: Defense Information Systems Agency
 Distributed Computing Environment (DCE)
    An architecture of standard programming interfaces, conventions,
    and server functionalities (e.g., naming, distributed file system,
    remote procedure call) for distributing applications transparently
    across networks of heterogeneous computers.  Promoted and
    controlled by the Open Software Foundation (OSF), a consortium led
    by Digital, IBM and Hewlett Packard.
    [Source: RFC1208]
 distributed database
    A collection of several different data repositories that looks
    like a single database to the user.  A prime example in the
    Internet is the Domain Name System.
 DIX Ethernet
    See: Ethernet
 DNS
    See: Domain Name System
 domain
    "Domain" is a heavily overused term in the Internet.  It can be
    used in the Administrative Domain context, or the Domain Name
    context.  See also: Administrative Domain, Domain Name System.
 Domain Name System (DNS)
    The DNS is a general purpose distributed, replicated, data query
    service.  The principal use is the lookup of host IP addresses
    based on host names.  The style of host names now used in the
    Internet is called "domain name", because they are the style of
    names used to look up anything in the DNS.  Some important domains
    are: .COM (commercial), .EDU (educational), .NET (network
    operations), .GOV (U.S. government), and .MIL (U.S. military).
    Most countries also have a domain.  For example, .US (United
    States), .UK (United Kingdom), .AU (Australia).  It is defined in
    STD 13, RFCs 1034 and 1035.  See also: Fully Qualified Domain
    Name.
 dot address (dotted decimal notation)
    Dot address refers to the common notation for IP addresses of the
    form A.B.C.D; where each letter represents, in decimal, one byte
    of a four byte IP address.  See also: IP address.
    [Source: FYI4]

User Glossary Working Group [Page 15] RFC 1392 Internet Glossary January 1993

 DS1
    A framing specification for T-1 synchronous lines.  See also: T1
 DS3
    A framing specification for T-3 synchronous lines.  See also: T3
 DSA
    See: Directory System Agent
 DTE
    Data Terminal Equipment
 DUA
    See: Directory User Agent
 dynamic adaptive routing
    Automatic rerouting of traffic based on a sensing and analysis of
    current actual network conditions.  NOTE: this does not include
    cases of routing decisions taken on predefined information.
    [Source: J. Postel]
 EARN
    See: European Academic and Research Network
 EBCDIC
    See: Extended Binary Coded Decimal Interchange Code
 Ebone
    A pan-European backbone service.
 EFF
    See: Electronic Frontier Foundation
 EFLA
    See: Extended Four Letter Acronym
 EGP
    See: Exterior Gateway Protocol
 Electronic Frontier Foundation (EFF)
    A foundation established to address social and legal issues
    arising from the impact on society of the increasingly pervasive
    use of computers as a means of communication and information
    distribution.
 Electronic Mail (email)
    A system whereby a computer user can exchange messages with other
    computer users (or groups of users) via a communications network.

User Glossary Working Group [Page 16] RFC 1392 Internet Glossary January 1993

    Electronic mail is one of the most popular uses of the Internet.
    [Source: NNSC]
 email
    See: Electronic mail
 email address
    The domain-based or UUCP address that is used to send electronic
    mail to a specified destination.  For example an editor's address
    is "gmalkin@xylogics.com".  See also: bang path, mail path, UNIX-
    to-UNIX CoPy.
    [Source: ZEN]
 encapsulation
    The technique used by layered protocols in which a layer adds
    header information to the protocol data unit (PDU) from the layer
    above.  As an example, in Internet terminology, a packet would
    contain a header from the physical layer, followed by a header
    from the network layer (IP), followed by a header from the
    transport layer (TCP), followed by the application protocol data.
    [Source: RFC1208]
 encryption
    Encryption is the manipulation of a packet's data in order to
    prevent any but the intended recipient from reading that data.
    There are many types of data encryption, and they are the basis of
    network security.  See also: Data Encryption Standard.
 Ethernet
    A 10-Mb/s standard for LANs, initially developed by Xerox, and
    later refined by Digital, Intel and Xerox (DIX).  All hosts are
    connected to a coaxial cable where they contend for network access
    using a Carrier Sense Multiple Access with Collision Detection
    (CSMA/CD) paradigm.  See also: 802.x, Local Area Network, token
    ring.
 Ethernet meltdown
    An event that causes saturation, or near saturation, on an
    Ethernet.  It usually results from illegal or misrouted packets
    and typically lasts only a short time.
    [Source: COMER]
 European Academic and Research Network (EARN)
    A network connecting European academic and research institutions
    with electronic mail and file transfer services using the Bitnet
    protocol.  See also: Bitnet

User Glossary Working Group [Page 17] RFC 1392 Internet Glossary January 1993

 Extended Binary Coded Decimal Interchange Code (EBCDIC)
    A standard character-to-number encoding used primarily by IBM
    computer systems.  See also: ASCII.
 Extended Four Letter Acronym (EFLA)
    A recognition of the fact that there are far too many TLAs.  See
    also: Three Letter Acronym.
    [Source: K. Morgan]
 Exterior Gateway Protocol (EGP)
    A protocol which distributes routing information to the routers
    which connect autonomous systems.  The term "gateway" is
    historical, as "router" is currently the preferred term.  There is
    also a routing protocol called EGP defined in STD 18, RFC 904.
    See also: Autonomous System, Border Gateway Protocol, Interior
    Gateway Protocol.
 eXternal Data Representation (XDR)
    A standard for machine independent data structures developed by
    Sun Microsystems and defined in RFC 1014.  It is similar to ASN.1.
    See also: Abstract Syntax Notation One.
    [Source: RFC1208]
 FARNET
    A non-profit corporation, established in 1987, whose mission is to
    advance the use of computer networks to improve research and
    education.
 FAQ
    Frequently Asked Question
 FDDI
    See: Fiber Distributed Data Interface
 Federal Information Exchange (FIX)
    One of the connection points between the American governmental
    internets and the Internet.
    [Source: SURA]
 Federal Networking Council (FNC)
    The coordinating group of representatives from those federal
    agencies involved in the development and use of federal
    networking, especially those networks using TCP/IP and the
    Internet.  Current members include representatives from DOD, DOE,
    DARPA, NSF, NASA, and HHS.  See also: Defense Advanced Research
    Projects Agency, National Science Foundation.

User Glossary Working Group [Page 18] RFC 1392 Internet Glossary January 1993

 Fiber Distributed Data Interface (FDDI)
    A high-speed (100Mb/s) LAN standard.  The underlying medium is
    fiber optics, and the topology is a dual-attached, counter-
    rotating token ring.  See also: Local Area Network, token ring.
    [Source: RFC1208]
 file transfer
    The copying of a file from one computer to another over a computer
    network.  See also: File Transfer Protocol, Kermit.
 File Transfer Protocol (FTP)
    A protocol which allows a user on one host to access, and transfer
    files to and from, another host over a network.  Also, FTP is
    usually the name of the program the user invokes to execute the
    protocol.  It is defined in STD 9, RFC 959.  See also: anonymous
    FTP.
 finger
    A program that displays information about a particular user, or
    all users, logged on the local system or on a remote system.  It
    typically shows full name, last login time, idle time, terminal
    line, and terminal location (where applicable).  It may also
    display plan and project files left by the user.
 FIX
    See: Federal Information Exchange
 flame
    A strong opinion and/or criticism of something, usually as a frank
    inflammatory statement, in an electronic mail message.  It is
    common to precede a flame with an indication of pending fire
    (i.e., FLAME ON!).  Flame Wars occur when people start flaming
    other people for flaming when they shouldn't have.  See also:
    Electronic Mail
 FNC
    See: Federal Networking Council
 For Your Information (FYI)
    A subseries of RFCs that are not technical standards or
    descriptions of protocols.  FYIs convey general information about
    topics related to TCP/IP or the Internet.  See also: Request For
    Comments, STD.
 FQDN
    See: Fully Qualified Domain Name

User Glossary Working Group [Page 19] RFC 1392 Internet Glossary January 1993

 fragment
    A piece of a packet.  When a router is forwarding an IP packet to
    a network that has a maximum packet size smaller than the packet
    size, it is forced to break up that packet into multiple
    fragments.  These fragments will be reassembled by the IP layer at
    the destination host.
 fragmentation
    The IP process in which a packet is broken into smaller pieces to
    fit the requirements of a physical network over which the packet
    must pass.  See also: reassembly.
 frame
    A frame is a datalink layer "packet" which contains the header and
    trailer information required by the physical medium.  That is,
    network layer packets are encapsulated to become frames.  See
    also: datagram, encapsulation, packet.
 freenet
    Community-based bulletin board system with email, information
    services, interactive communications, and conferencing.  Freenets
    are funded and operated by individuals and volunteers -- in one
    sense, like public television.  They are part of the National
    Public Telecomputing Network (NPTN), an organization based in
    Cleveland, Ohio, devoted to making computer telecommunication and
    networking services as freely available as public libraries.
    [Source: LAQUEY]
 FTP
    See: File Transfer Protocol
 Fully Qualified Domain Name (FQDN)
    The FQDN is the full name of a system, rather than just its
    hostname.  For example, "venera" is a hostname and
    "venera.isi.edu" is an FQDN.  See also: hostname, Domain Name
    System.
 FYI
    See: For Your Information
 gross
    A dozen dozen (144).
 gated
    Gatedaemon.  A program which supports multiple routing protocols
    and protocol families.  It may be used for routing, and makes an
    effective platform for routing protocol research.  The software is
    freely available by anonymous FTP from "gated.cornell.edu".

User Glossary Working Group [Page 20] RFC 1392 Internet Glossary January 1993

    Pronounced "gate-dee".  See also: Exterior Gateway Protocol, Open
    Shortest Path First..., Routing Information Protocol, routed.
 gateway
    The term "router" is now used in place of the original definition
    of "gateway".  Currently, a gateway is a communications
    device/program which passes data between networks having similar
    functions but dissimilar implementations.  This should not be
    confused with a protocol converter.  By this definition, a router
    is a layer 3 (network layer) gateway, and a mail gateway is a
    layer 7 (application layer) gateway.  See also: mail gateway,
    router, protocol converter.
 Gopher
    A distributed information service that makes available
    hierarchical collections of information across the Internet.
    Gopher uses a simple protocol that allows a single Gopher client
    to access information from any accessible Gopher server, providing
    the user with a single "Gopher space" of information.  Public
    domain versions of the client and server are available.  See also:
    archie, archive site, Prospero, Wide Area Information Servers.
 GOSIP
    See: Government OSI Profile
 Government OSI Profile
    A subset of OSI standards specific to U.S. Government
    procurements, designed to maximize interoperability in areas where
    plain OSI standards are ambiguous or allow excessive options.
    [Source: BIG-LAN]
 hacker
    A person who delights in having an intimate understanding of the
    internal workings of a system, computers and computer networks in
    particular.  The term is often misused in a pejorative context,
    where "cracker" would be the correct term.  See also: cracker.
 header
    The portion of a packet, preceding the actual data, containing
    source and destination addresses, and error checking and other
    fields.  A header is also the part of an electronic mail message
    that precedes the body of a message and contains, among other
    things, the message originator, date and time.  See also:
    Electronic Mail, packet.
 heterogeneous network
    A network running multiple network layer protocols.  See also:
    DECnet, IP, IPX, XNS.

User Glossary Working Group [Page 21] RFC 1392 Internet Glossary January 1993

 hierarchical routing
    The complex problem of routing on large networks can be simplified
    by reducing the size of the networks.  This is accomplished by
    breaking a network into a hierarchy of networks, where each level
    is responsible for its own routing.  The Internet has, basically,
    three levels: the backbones, the mid-levels, and the stub
    networks.  The backbones know how to route between the mid-levels,
    the mid-levels know how to route between the sites, and each site
    (being an autonomous system) knows how to route internally.  See
    also: Autonomous System, Exterior Gateway Protocol, Interior
    Gateway Protocol, stub network, transit network.
 High Performance Computing and Communications (HPCC)
    High performance computing encompasses advanced computing,
    communications, and information technologies, including scientific
    workstations, supercomputer systems, high speed networks, special
    purpose and experimental systems, the new generation of large
    scale parallel systems, and application and systems software with
    all components well integrated and linked over a high speed
    network.
    [Source: HPCC]
 High Performance Parallel Interface (HIPPI)
    An emerging ANSI standard which extends the computer bus over
    fairly short distances at speeds of 800 and 1600 Mb/s.  HIPPI is
    often used in a computer room to connect a supercomputer to
    routers, frame buffers, mass-storage peripherals, and other
    computers.  See also: American National Standards Institute
    [Source: MALAMUD]
 HIPPI
    See: High Performance Parallel Interface
 hop
    A term used in routing.  A path to a destination on a network is a
    series of hops, through routers, away from the origin.
 host
    A computer that allows users to communicate with other host
    computers on a network.  Individual users communicate by using
    application programs, such as electronic mail, Telnet and FTP.
    [Source: NNSC]
 host address
    See: internet address
 hostname
    The name given to a machine.  See also: Fully Qualified Domain

User Glossary Working Group [Page 22] RFC 1392 Internet Glossary January 1993

    Name.
    [Source: ZEN]
 host number
    See: host address
 HPCC
    See: High Performance Computing and Communications
 hub
    A device connected to several other devices.  In ARCnet, a hub is
    used to connect several computers together.  In a message handling
    service, a hub is used for the transfer of messages across the
    network.
    [Source: MALAMUD]
 I-D
    See: Internet-Draft
 IAB
    See: Internet Architecture Board
 IANA
    See: Internet Assigned Numbers Authority
 ICMP
    See: Internet Control Message Protocol
 IEEE
    Institute of Electrical and Electronics Engineers
 IEEE 802
    See: 802.x
 IEN
    See: Internet Experiment Note
 IESG
    See: Internet Engineering Steering Group
 IETF
    See: Internet Engineering Task Force
 IINREN
    See: Interagency Interim National Research and Education Network
 IGP
    See: Interior Gateway Protocol

User Glossary Working Group [Page 23] RFC 1392 Internet Glossary January 1993

 IMHO
    In My Humble Opinion
 IMR
    See: Internet Monthly Report
 Integrated Services Digital Network (ISDN)
    An emerging technology which is beginning to be offered by the
    telephone carriers of the world.  ISDN combines voice and digital
    network services in a single medium, making it possible to offer
    customers digital data services as well as voice connections
    through a single "wire".  The standards that define ISDN are
    specified by CCITT.  See also: CCITT.
    [Source: RFC1208]
 Interagency Interim National Research and Education Network (IINREN)
    An evolving operating network system.  Near term (1992-1996)
    research and development activities will provide for the smooth
    evolution of this networking infrastructure into the future
    gigabit NREN.
    [Source: HPCC]
 Interior Gateway Protocol (IGP)
    A protocol which distributes routing information to the routers
    within an autonomous system.  The term "gateway" is historical, as
    "router" is currently the preferred term.  See also: Autonomous
    System, Exterior Gateway Protocol, Open Shortest Path First...,
    Routing Information Protocol.
 Intermediate System (IS)
    An OSI system which performs network layer forwarding.  It is
    analogous to an IP router.  See also: Open Systems
    Interconnection, router.
 Intermediate System-Intermediate System (IS-IS)
    The OSI IGP.  See also: Open Systems Interconnection, Interior
    Gateway Protocol.
 International Organization for Standardization (ISO)
    A voluntary, nontreaty organization founded in 1946 which is
    responsible for creating international standards in many areas,
    including computers and communications.  Its members are the
    national standards organizations of the 89 member countries,
    including ANSI for the U.S.  See also: American National Standards
    Institute, Open Systems Interconnection.
    [Source: TAN]

User Glossary Working Group [Page 24] RFC 1392 Internet Glossary January 1993

 internet
    While an internet is a network, the term "internet" is usually
    used to refer to a collection of networks interconnected with
    routers.  See also: network.
 Internet
    (note the capital "I") The Internet is the largest internet in the
    world.  Is a three level hierarchy composed of backbone networks
    (e.g., NSFNET, MILNET), mid-level networks, and stub networks.
    The Internet is a multiprotocol internet.  See also: backbone,
    mid-level network, stub network, transit network, Internet
    Protocol, Corporation for Research and Educational Networks,
    National Science Foundation.
 internet address
    A IP address that uniquely identifies a node on an internet.  An
    Internet address (capital "I"), uniquely identifies a node on the
    Internet.  See also: internet, Internet, IP address.
 Internet Architecture Board (IAB)
    The technical body that oversees the development of the Internet
    suite of protocols.  It has two task forces: the IETF and the
    IRTF.  "IAB" previously stood for Internet Activities Board.  See
    also: Internet Engineering Task Force, Internet Research Task
    Force.
 Internet Assigned Numbers Authority (IANA)
    The central registry for various Internet protocol parameters,
    such as port, protocol and enterprise numbers, and options, codes
    and types.  The currently assigned values are listed in the
    "Assigned Numbers" document [STD2].  To request a number
    assignment, contact the IANA at "iana@isi.edu".  See also:
    assigned numbers, STD.
 Internet Control Message Protocol (ICMP)
    ICMP is an extension to the Internet Protocol.  It allows for the
    generation of error messages, test packets and informational
    messages related to IP.  It is defined in STD 5, RFC 792.
    [Source: FYI4]
 Internet-Draft (I-D)
    Internet-Drafts are working documents of the IETF, its Areas, and
    its Working Groups.   As the name implies, Internet-Drafts are
    draft documents.  They are valid for a maximum of six months and
    may be updated, replaced, or obsoleted by other documents at any
    time.  Very often, I-Ds are precursors to RFCs.  See also:
    Internet Engineering Task Force, Request For Comments.

User Glossary Working Group [Page 25] RFC 1392 Internet Glossary January 1993

 Internet Engineering Steering Group (IESG)
    The IESG is composed of the IETF Area Directors and the IETF
    Chair.  It provides the first technical review of Internet
    standards and is responsible for day-to-day "management" of the
    IETF.  See also: Internet Engineering Task Force.
 Internet Engineering Task Force (IETF)
    The IETF is a large, open community of network designers,
    operators, vendors, and researchers whose purpose is to coordinate
    the operation, management and evolution of the Internet, and to
    resolve short-range and mid-range protocol and architectural
    issues.  It is a major source of proposals for protocol standards
    which are submitted to the IAB for final approval.  The IETF meets
    three times a year and extensive minutes are included in the IETF
    Proceedings.  See also: Internet, Internet Architecture Board.
    [Source: FYI4]
 Internet Experiment Note (IEN)
    A series of reports pertinent to the Internet.  IENs were
    published in parallel to RFCs and are no longer active.  See also:
    Internet-Draft, Request For Comments.
 Internet Monthly Report (IMR)
    Published monthly, the purpose of the Internet Monthly Reports is
    to communicate to the Internet Research Group the accomplishments,
    milestones reached, or problems discovered by the participating
    organizations.
 internet number
    See: internet address
 Internet Protocol (IP)
    The Internet Protocol, defined in STD 5, RFC 791, is the network
    layer for the TCP/IP Protocol Suite.  It is a connectionless,
    best-effort packet switching protocol.  See also: packet
    switching, Request For Comments, TCP/IP Protocol Suite.
 Internet Registry (IR)
    The IANA has the discretionary authority to delegate portions of
    its responsibility and, with respect to network address and
    Autonomous System identifiers, has lodged this responsibility with
    an IR.  The IR function is performed by the DDN NIC.  See also:
    Autonomous System, network address, Defense Data Network...,
    Internet Assigned Numbers Authority.
 Internet Relay Chat (IRC)
    A world-wide "party line" protocol that allows one to converse
    with others in real time.  IRC is structured as a network of

User Glossary Working Group [Page 26] RFC 1392 Internet Glossary January 1993

    servers, each of which accepts connections from client programs,
    one per user.  See also: talk.
    [Source: HACKER]
 Internet Research Steering Group (IRSG)
    The "governing body" of the IRTF.  See also: Internet Research
    Task Force.
    [Source: MALAMUD]
 Internet Research Task Force (IRTF)
    The IRTF is chartered by the IAB to consider long-term Internet
    issues from a theoretical point of view.  It has Research Groups,
    similar to IETF Working Groups, which are each tasked to discuss
    different research topics.  Multi-cast audio/video conferencing
    and privacy enhanced mail are samples of IRTF output.  See also:
    Internet Architecture Board, Internet Engineering Task Force,
    Privacy Enhanced Mail.
 Internet Society (ISOC)
    The Internet Society is a non-profit, professional membership
    organization which facilitates and supports the technical
    evolution of the Internet, stimulates interest in and educates the
    scientific and academic communities, industry and the public about
    the technology, uses and applications of the Internet, and
    promotes the development of new applications for the system.  The
    Society provides a forum for discussion and collaboration in the
    operation and use of the global Internet infrastructure.  The
    Internet Society publishes a quarterly newsletter, the Internet
    Society News, and holds an annual conference, INET.  The
    development of Internet technical standards takes place under the
    auspices of the Internet Society with substantial support from the
    Corporation for National Research Initiatives under a cooperative
    agreement with the US Federal Government.
    [Source: V. Cerf]
 Internetwork Packet eXchange (IPX)
    Novell's protocol used by Netware.  A router with IPX routing can
    interconnect LANs so that Novell Netware clients and servers can
    communicate.  See also: Local Area Network.
 interoperability
    The ability of software and hardware on multiple machines from
    multiple vendors to communicate meaningfully.
 IP
    See: Internet Protocol

User Glossary Working Group [Page 27] RFC 1392 Internet Glossary January 1993

 IP address
    The 32-bit address defined by the Internet Protocol in STD 5, RFC
    791.  It is usually represented in dotted decimal notation.  See
    also: dot address, internet address, Internet Protocol, network
    address, subnet address, host address.
 IP datagram
    See: datagram
 IPX
    See: Internetwork Packet eXchange
 IR
    See: Internet Registry
 IRC
    See: Internet Relay Chat
 IRSG
    See: Internet Research Steering Group
 IRTF
    See: Internet Research Task Force
 IS
    See: Intermediate System
 IS-IS
    See: Intermediate System-Intermediate System
 ISDN
    See: Integrated Services Digital Network
 ISO
    See: International Organization for Standardization
 ISO Development Environment (ISODE)
    Software that allows OSI services to use a TCP/IP network.
    Pronounced eye-so-dee-eee.  See also: Open Systems
    Interconnection, TCP/IP Protocol Suite.
 ISOC
    See: Internet Society
 ISODE
    See: ISO Development Environment

User Glossary Working Group [Page 28] RFC 1392 Internet Glossary January 1993

 JKREY
    Joyce K. Reynolds
 KA9Q
    A popular implementation of TCP/IP and associated protocols for
    amateur packet radio systems.  See also: TCP/IP Protocol Suite.
    [Source: RFC1208]
 Kerberos
    Kerberos is the security system of MIT's Project Athena.  It is
    based on symmetric key cryptography.  See also: encryption.
 Kermit
    A popular file transfer protocol developed by Columbia University.
    Because Kermit runs in most operating environments, it provides an
    easy method of file transfer.  Kermit is NOT the same as FTP.  See
    also: File Transfer Protocol
    [Source: MALAMUD]
 Knowbot
    An experimental directory service.  See also: white pages, WHOIS,
    X.500.
 LAN
    See: Local Area Network
 layer
    Communication networks for computers may be organized as a set of
    more or less independent protocols, each in a different layer
    (also called level).  The lowest layer governs direct host-to-host
    communication between the hardware at different hosts; the highest
    consists of user applications.  Each layer builds on the layer
    beneath it.  For each layer, programs at different hosts use
    protocols appropriate to the layer to communicate with each other.
    TCP/IP has five layers of protocols; OSI has seven.  The
    advantages of different layers of protocols is that the methods of
    passing information from one layer to another are specified
    clearly as part of the protocol suite, and changes within a
    protocol layer are prevented from affecting the other layers.
    This greatly simplifies the task of designing and maintaining
    communication programs.  See also: Open Systems Interconnection,
    TCP/IP Protocol Suite.
 listserv
    An automated mailing list distribution system originally designed
    for the Bitnet/EARN network.  See also: Bitnet, European Academic
    Research Network, mailing list.

User Glossary Working Group [Page 29] RFC 1392 Internet Glossary January 1993

 little-endian
    A format for storage or transmission of binary data in which the
    least significant byte (bit) comes first.  See also: big-endian.
    [Source: RFC1208]
 LLC
    See: Logical Link Control
 Local Area Network (LAN)
    A data network intended to serve an area of only a few square
    kilometers or less.  Because the network is known to cover only a
    small area, optimizations can be made in the network signal
    protocols that permit data rates up to 100Mb/s.  See also:
    Ethernet, Fiber Distributed Data Interface, token ring, Wide Area
    Network.
    [Source: NNSC]
 Logical Link Control (LLC)
    The upper portion of the datalink layer, as defined in IEEE 802.2.
    The LLC sublayer presents a uniform interface to the user of the
    datalink service, usually the network layer.  Beneath the LLC
    sublayer is the MAC sublayer.  See also: 802.x, layer, Media
    Access Control.
 Lurking
    No active participation on the part of a subscriber to an mailing
    list or USENET newsgroup.  A person who is lurking is just
    listening to the discussion.  Lurking is encouraged for beginners
    who need to get up to speed on the history of the group.  See
    also: Electronic Mail, mailing list, Usenet.
    [Source: LAQUEY]
 MAC
    See: Media Access Control
 MAC address
    The hardware address of a device connected to a shared media.  See
    also: Media Access Control, Ethernet, token ring.
    [Source: MALAMUD]
 mail bridge
    A mail gateway that forwards electronic mail between two or more
    networks while ensuring that the messages it forwards meet certain
    administrative criteria.  A mail bridge is simply a specialized
    form of mail gateway that enforces an administrative policy with
    regard to what mail it forwards.  See also: Electronic Mail, mail
    gateway.
    [Source: NNSC]

User Glossary Working Group [Page 30] RFC 1392 Internet Glossary January 1993

 Mail Exchange Record (MX Record)
    A DNS resource record type indicating which host can handle mail
    for a particular domain.  See also: Domain Name System, Electronic
    Mail.
    [Source: MALAMUD]
 mail exploder
    Part of an electronic mail delivery system which allows a message
    to be delivered to a list of addresses.  Mail exploders are used
    to implement mailing lists.  Users send messages to a single
    address and the mail exploder takes care of delivery to the
    individual mailboxes in the list.  See also: Electronic Mail,
    email address, mailing list.
    [Source: RFC1208]
 mail gateway
    A machine that connects two or more electronic mail systems
    (including dissimilar mail systems) and transfers messages between
    them.  Sometimes the mapping and translation can be quite complex,
    and it generally requires a store-and-forward scheme whereby the
    message is received from one system completely before it is
    transmitted to the next system, after suitable translations.  See
    also: Electronic Mail.
    [Source: RFC1208]
 mail path
    A series of machine names used to direct electronic mail from one
    user to another.  This system of email addressing has been used
    primarily in UUCP networks which are trying to eliminate its use
    altogether.  See also: bang path, email address, UNIX-to-UNIX
    CoPy.
 mail server
    A software program that distributes files or information in
    response to requests sent via email.  Internet examples include
    Almanac and netlib.  Mail servers have also been used in Bitnet to
    provide FTP-like services.  See also: Bitnet, Electronic Mail,
    FTP.
    [Source: NWNET]
 mailing list
    A list of email addresses, used by a mail exploder, to forward
    messages to groups of people.  Generally, a mailing list is used
    to discuss certain set of topics, and different mailing lists
    discuss different topics.  A mailing list may be moderated.  This
    means that messages sent to the list are actually sent to a
    moderator who determines whether or not to send the messages on to
    everyone else.  Requests to subscribe to, or leave, a mailing list

User Glossary Working Group [Page 31] RFC 1392 Internet Glossary January 1993

    should ALWAYS be sent to the list's "-request" address (e.g.,
    ietf-request@cnri.reston.va.us for the IETF mailing list).  See
    also: Electronic Mail, mail exploder.
 MAN
    See: Metropolitan Area Network
 Management Information Base (MIB)
    The set of parameters an SNMP management station can query or set
    in the SNMP agent of a network device (e.g., router).  Standard,
    minimal MIBs have been defined, and vendors often have Private
    enterprise MIBs.  In theory, any SNMP manager can talk to any SNMP
    agent with a properly defined MIB.  See also: client-server model,
    Simple Network Management Protocol.
    [Source: BIG-LAN]
 Martian
    A humorous term applied to packets that turn up unexpectedly on
    the wrong network because of bogus routing entries.  Also used as
    a name for a packet which has an altogether bogus (non-registered
    or ill-formed) internet address.
    [Source: RFC1208]
 Maximum Transmission Unit (MTU)
    The largest frame length which may be sent on a physical medium.
    See also: fragmentation, frame.
 Media Access Control (MAC)
    The lower portion of the datalink layer.  The MAC differs for
    various physical media.  See also: MAC Address, Ethernet, Logical
    Link Control, token ring.
 message switching
    See: packet switching
 Metropolitan Area Network (MAN)
    A data network intended to serve an area approximating that of a
    large city.  Such networks are being implemented by innovative
    techniques, such as running fiber cables through subway tunnels.
    A popular example of a MAN is SMDS.  See also: Local Area Network,
    Switched Multimegabit Data Service, Wide Area Network.
    [Source: NNSC]
 MIB
    See: Management Information Base
 mid-level network
    Mid-level networks (a.k.a. regionals) make up the second level of

User Glossary Working Group [Page 32] RFC 1392 Internet Glossary January 1993

    the Internet hierarchy.  They are the transit networks which
    connect the stub networks to the backbone networks.  See also:
    backbone, Internet, stub network, transit network.
 MIME
    See: Multipurpose Internet Mail Extensions
 moderator
    A person, or small group of people, who manage moderated mailing
    lists and newsgroups.  Moderators are responsible for determining
    which email submissions are passed on to list.  See also:
    Electronic Mail, mailing list, Usenet.
 MTU
    See: Maximum Transmission Unit
 MUD
    See: Multi-User Dungeon
 multicast
    A packet with a special destination address which multiple nodes
    on the network may be willing to receive.  See also: broadcast.
 multihomed host
    A host which has more than one connection to a network.  The host
    may send and receive data over any of the links but will not route
    traffic for other nodes.  See also: host, router.
    [Source: MALAMUD]
 Multipurpose Internet Mail Extensions (MIME)
    An extension to Internet email which provides the ability to
    transfer non-textual data, such as graphics, audio and fax.  It is
    defined in RFC 1341.  See also: Electronic Mail
 Multi-User Dungeon (MUD)
    Adventure, role playing games, or simulations played on the
    Internet.  Devotees call them "text-based virtual reality
    adventures".  The games can feature fantasy combat, booby traps
    and magic.  Players interact in real time and can change the
    "world" in the game as they play it.  Most MUDs are based on the
    Telnet protocol.  See also: Telnet.
    [Source: LAQUEY]
 MX Record
    See: Mail Exchange Record
 NAK
    See: Negative Acknowledgment

User Glossary Working Group [Page 33] RFC 1392 Internet Glossary January 1993

 name resolution
    The process of mapping a name into its corresponding address.  See
    also: Domain Name System.
    [Source: RFC1208]
 namespace
    A commonly distributed set of names in which all names are unique.
    [Source: MALAMUD]
 National Institute of Standards and Technology (NIST)
    United States governmental body that provides assistance in
    developing standards.  Formerly the National Bureau of Standards.
    [Source: MALAMUD]
 National Research and Education Network (NREN)
    The NREN is the realization of an interconnected gigabit computer
    network devoted to Hign Performance Computing and Communications.
    See also: HPPC, IINREN.
    [Source: HPCC]
 National Science Foundation (NSF)
    A U.S. government agency whose purpose is to promote the
    advancement of science.  NSF funds science researchers, scientific
    projects, and infrastructure to improve the quality of scientific
    research.  The NSFNET, funded by NSF, is an essential part of
    academic and research communications.  It is a highspeed "network
    of networks" which is hierarchical in nature.  At the highest
    level, it is a backbone network currently comprising 16 nodes
    connected to a 45Mb/s facility which spans the continental United
    States.  Attached to that are mid-level networks and attached to
    the mid-levels are campus and local networks.  NSFNET also has
    connections out of the U.S. to Canada, Mexico, Europe, and the
    Pacific Rim.  The NSFNET is part of the Internet.
 Negative Acknowledgment (NAK)
    Response to receipt of a corrupted packet of information.  See
    also: Acknowledgement.
 netiquette
    A pun on "etiquette" referring to proper behavior on a network.
 Netnews
    See: Usenet
 network
    A computer network is a data communications system which
    interconnects computer systems at various different sites.  A
    network may be composed of any combination of LANs, MANs or WANs.

User Glossary Working Group [Page 34] RFC 1392 Internet Glossary January 1993

    See also: Local Area Network, Metropolitan Area Network, Wide Area
    Network, internet.
 network address
    The network portion of an IP address.  For a class A network, the
    network address is the first byte of the IP address.  For a class
    B network, the network address is the first two bytes of the IP
    address.  For a class C network, the network address is the first
    three bytes of the IP address.  In each case, the remainder is the
    host address.  In the Internet, assigned network addresses are
    globally unique.  See also: Internet, IP address, subnet address,
    host address, Internet Registry.
 Network File System (NFS)
    A protocol developed by Sun Microsystems, and defined in RFC 1094,
    which allows a computer system to access files over a network as
    if they were on its local disks.  This protocol has been
    incorporated in products by more than two hundred companies, and
    is now a de facto Internet standard.
    [Source: NNSC]
 Network Information Center (NIC)
    A NIC provides information, assistance and services to network
    users.  See also: Network Operations Center.
 Network Information Services (NIS)
    A set of services, generally provided by a NIC, to assist users in
    using the network.  See also: Network Information Center.
 Network News Transfer Protocol (NNTP)
    A protocol, defined in RFC 977, for the distribution, inquiry,
    retrieval, and posting of news articles.  See also: Usenet.
 network number
    See: network address
 Network Operations Center (NOC)
    A location from which the operation of a network or internet is
    monitored.  Additionally, this center usually serves as a
    clearinghouse for connectivity problems and efforts to resolve
    those problems.  See also: Network Information Center.
    [Source: NNSC]
 Network Time Protocol (NTP)
    A protocol that assures accurate local timekeeping with reference
    to radio and atomic clocks located on the Internet.  This protocol
    is capable of synchronizing distributed clocks within milliseconds
    over long time periods.  It is defined in STD 12, RFC 1119.  See

User Glossary Working Group [Page 35] RFC 1392 Internet Glossary January 1993

    also: Internet.
    [Source: NNSC]
 NFS
    See: Network File System
 NIC
    See: Network Information Center
 NIC.DDN.MIL
    This is the domain name of the DDN NIC.  See also: Defense Data
    Network..., Domain Name System, Network Information Center.
 NIS
    See: Network Information Services
 NIST
    See: National Institute of Standards and Technology
 NNTP
    See: Network News Transfer Protocol
 NOC
    See: Network Operations Center
 Nodal Switching System (NSS)
    Main routing nodes in the NSFnet backbone.  See also: backbone,
    National Science Foundation.
    [Source: MALAMUD]
 node
    An addressable device attached to a computer network.  See also:
    host, router.
 NREN
    See: National Research and Education Network
 NSF
    See: National Science Foundation
 NSS
    See: Nodal Switching System
 NTP
    See: Network Time Protocol
 OCLC
    See: Online Computer Library Catalog

User Glossary Working Group [Page 36] RFC 1392 Internet Glossary January 1993

 octet
    An octet is 8 bits.  This term is used in networking, rather than
    byte, because some systems have bytes that are not 8 bits long.
 Online Computer Library Catalog
    OCLC is a nonprofit membership organization offering computer-
    based services to libraries, educational organizations, and their
    users.  The OCLC library information network connects more than
    10,000 libraries worldwide.  Libraries use the OCLC System for
    cataloging, interlibrary loan, collection development,
    bibliographic verification, and reference searching.
    [Source: OCLC]
 Open Shortest-Path First Interior Gateway Protocol (OSPF)
    A link state, as opposed to distance vector, routing protocol.  It
    is an Internet standard IGP defined in RFC 1247.  See also:
    Interior Gateway Protocol, Routing Information Protocol.
 Open Systems Interconnection (OSI)
    A suite of protocols, designed by ISO committees, to be the
    international standard computer network architecture.  See also:
    International Organization for Standardization.
 OSI
    See: Open Systems Interconnection
 OSI Reference Model
    A seven-layer structure designed to describe computer network
    architectures and the way that data passes through them.  This
    model was developed by the ISO in 1978 to clearly define the
    interfaces in multivendor networks, and to provide users of those
    networks with conceptual guidelines in the construction of such
    networks.  See also: International Organization for
    Standardization.
    [Source: NNSC]
 OSPF
    See: Open Shortest-Path First Interior Gateway Protocol
 packet
    The unit of data sent across a network.  "Packet" a generic term
    used to describe unit of data at all levels of the protocol stack,
    but it is most correctly used to describe application data units.
    See also: datagram, frame.
 Packet InterNet Groper (PING)
    A program used to test reachability of destinations by sending
    them an ICMP echo request and waiting for a reply.  The term is

User Glossary Working Group [Page 37] RFC 1392 Internet Glossary January 1993

    used as a verb: "Ping host X to see if it is up!"  See also:
    Internet Control Message Protocol.
    [Source: RFC1208]
 Packet Switch Node (PSN)
    A dedicated computer whose purpose is to accept, route and forward
    packets in a packet switched network.  See also: packet switching,
    router.
    [Source: NNSC]
 packet switching
    A communications paradigm in which packets (messages) are
    individually routed between hosts, with no previously established
    communication path.  See also: circuit switching, connection-
    oriented, connectionless.
 PD
    Public Domain
 PDU
    See: Protocol Data Unit
 PEM
    See: Privacy Enhanced Mail
 PING
    See: Packet INternet Groper
 Point Of Presence (POP)
    A site where there exists a collection of telecommunications
    equipment, usually digital leased lines and multi-protocol
    routers.
 Point-to-Point Protocol (PPP)
    The Point-to-Point Protocol, defined in RFC 1171, provides a
    method for transmitting packets over serial point-to-point links.
    See also: Serial Line IP.
    [Source: FYI4]
 POP
    See: Post Office Protocol and Point Of Presence
 port
    A port is a transport layer demultiplexing value.  Each
    application has a unique port number associated with it.  See
    also: Transmission Control Protocol, User Datagram Protocol.

User Glossary Working Group [Page 38] RFC 1392 Internet Glossary January 1993

 Post Office Protocol (POP)
    A protocol designed to allow single user hosts to read mail from a
    server.  There are three versions: POP, POP2, and POP3.  Latter
    versions are NOT compatible with earlier versions.  See also:
    Electronic Mail.
 Postal Telegraph and Telephone (PTT)
    Outside the USA, PTT refers to a telephone service provider, which
    is usually a monopoly, in a particular country.
 postmaster
    The person responsible for taking care of electronic mail
    problems, answering queries about users, and other related work at
    a site.  See also: Electronic Mail.
    [Source: ZEN]
 PPP
    See: Point-to-Point Protocol
 Privacy Enhanced Mail (PEM)
    Internet email which provides confidentiality, authentication and
    message integrity using various encryption methods.  See also:
    Electronic Mail, encryption.
 Prospero
    A distributed filesystem which provides the user with the ability
    to create multiple views of a single collection of files
    distributed across the Internet.  Prospero provides a file naming
    system, and file access is provided by existing access methods
    (e.g., anonymous FTP and NFS).  The Prospero protocol is also used
    for communication between clients and servers in the archie
    system.  See also: anonymous FTP, archie, archive site, Gopher,
    Network File System, Wide Area Information Servers.
 protocol
    A formal description of message formats and the rules two
    computers must follow to exchange those messages.  Protocols can
    describe low-level details of machine-to-machine interfaces (e.g.,
    the order in which bits and bytes are sent across a wire) or
    high-level exchanges between allocation programs (e.g., the way in
    which two programs transfer a file across the Internet).
    [Source: MALAMUD]
 protocol converter
    A device/program which translates between different protocols
    which serve similar functions (e.g., TCP and TP4).

User Glossary Working Group [Page 39] RFC 1392 Internet Glossary January 1993

 Protocol Data Unit (PDU)
    "PDU" is internationalstandardscomitteespeak for packet.  See
    also: packet.
 protocol stack
    A layered set of protocols which work together to provide a set of
    network functions.  See also: layer, protocol.
 proxy ARP
    The technique in which one machine, usually a router, answers ARP
    requests intended for another machine.  By "faking" its identity,
    the router accepts responsibility for routing packets to the
    "real" destination.  Proxy ARP allows a site to use a single IP
    address with two physical networks.  Subnetting would normally be
    a better solution.  See also: Address Resolution Protocol
    [Source: RFC1208]
 PSN
    See: Packet Switch Node.
 PTT
    See: Postal, Telegraph and Telephone
 queue
    A backup of packets awaiting processing.
 RARE
    See: Reseaux Associes pour la Recherche Europeenne
 RARP
    See: Reverse Address Resolution Protocol
 RBOC
    Regional Bell Operating Company
 RCP
    See: Remote copy program
 Read the F*cking Manual (RTFM)
    This acronym is often used when someone asks a simple or common
    question.
 reassembly
    The IP process in which a previously fragmented packet is
    reassembled before being passed to the transport layer.  See also:
    fragmentation.

User Glossary Working Group [Page 40] RFC 1392 Internet Glossary January 1993

 recursive
    See: recursive
 regional
    See: mid-level network
 remote login
    Operating on a remote computer, using a protocol over a computer
    network, as though locally attached.  See also: Telnet.
 Remote Procedure Call (RPC)
    An easy and popular paradigm for implementing the client-server
    model of distributed computing.  In general, a request is sent to
    a remote system to execute a designated procedure, using arguments
    supplied, and the result returned to the caller.  There are many
    variations and subtleties in various implementations, resulting in
    a variety of different (incompatible) RPC protocols.
    [Source: RFC1208]
 repeater
    A device which propagates electrical signals from one cable to
    another.  See also: bridge, gateway, router.
 Request For Comments (RFC)
    The document series, begun in 1969, which describes the Internet
    suite of protocols and related experiments.  Not all (in fact very
    few) RFCs describe Internet standards, but all Internet standards
    are written up as RFCs.  The RFC series of documents is unusual in
    that the proposed protocols are forwarded by the Internet research
    and development community, acting on their own behalf, as opposed
    to the formally reviewed and standardized protocols that are
    promoted by organizations such as CCITT and ANSI.  See also: For
    Your Information, STD.
 Reseaux Associes pour la Recherche Europeenne (RARE)
    European association of research networks.
    [Source: RFC1208]
 Reseaux IP Europeenne (RIPE)
    A collaboration between European networks which use the TCP/IP
    protocol suite.
 Reverse Address Resolution Protocol (RARP)
    A protocol, defined in RFC 903, which provides the reverse
    function of ARP.  RARP maps a hardware (MAC) address to an
    internet address.  It is used primarily by diskless nodes when
    they first initialize to find their internet address.  See also:
    Address Resolution Protocol, BOOTP, internet address, MAC address.

User Glossary Working Group [Page 41] RFC 1392 Internet Glossary January 1993

 RFC
    See: Request For Comments
 RFC 822
    The Internet standard format for electronic mail message headers.
    Mail experts often refer to "822 messages".  The name comes from
    "RFC 822", which contains the specification (STD 11, RFC 822).
    822 format was previously known as 733 format.  See also:
    Electronic Mail.
    [Source: COMER]
 RIP
    See: Routing Information Protocol
 RIPE
    See: Reseaux IP Europeenne
 Round-Trip Time (RTT)
    A measure of the current delay on a network.
    [Source: MALAMUD]
 route
    The path that network traffic takes from its source to its
    destination.  Also, a possible path from a given host to another
    host or destination.
 routed
    Route Daemon.  A program which runs under 4.2BSD/4.3BSD UNIX
    systems (and derived operating systems) to propagate routes among
    machines on a local area network, using the RIP protocol.
    Pronounced "route-dee".  See also: Routing Information Protocol,
    gated.
 router
    A device which forwards traffic between networks.  The forwarding
    decision is based on network layer information and routing tables,
    often constructed by routing protocols.  See also: bridge,
    gateway, Exterior Gateway Protocol, Interior Gateway Protocol.
 routing
    The process of selecting the correct interface and next hop for a
    packet being forwarded.  See also: hop, router, Exterior Gateway
    Protocol, Interior Gateway Protocol.
 routing domain
    A set of routers exchanging routing information within an
    administrative domain.  See also: Administrative Domain, router.

User Glossary Working Group [Page 42] RFC 1392 Internet Glossary January 1993

 Routing Information Protocol (RIP)
    A distance vector, as opposed to link state, routing protocol.  It
    is an Internet standard IGP defined in STD 34, RFC 1058 (updated
    by RFC 1388).  See also: Interior Gateway Protocol, Open Shortest
    Path First....
 RPC
    See: Remote Procedure Call
 RTFM
    See: Read the F*cking Manual
 RTT
    See: Round-Trip Time
 Serial Line IP (SLIP)
    A protocol used to run IP over serial lines, such as telephone
    circuits or RS-232 cables, interconnecting two systems.  SLIP is
    defined in RFC 1055.  See also: Point-to-Point Protocol.
 server
    A provider of resources (e.g., file servers and name servers).
    See also: client, Domain Name System, Network File System.
 SIG
    Special Interest Group
 signature
    The three or four line message at the bottom of a piece of email
    or a Usenet article which identifies the sender.  Large signatures
    (over five lines) are generally frowned upon.  See also:
    Electronic Mail, Usenet.
 Simple Mail Transfer Protocol (SMTP)
    A protocol, defined in STD 10, RFC 821, used to transfer
    electronic mail between computers.  It is a server to server
    protocol, so other protocols are used to access the messages.  See
    also: Electronic Mail, Post Office Protocol, RFC 822.
 Simple Network Management Protocol (SNMP)
    The Internet standard protocol, defined in STD 15, RFC 1157,
    developed to manage nodes on an IP network.  It is currently
    possible to manage wiring hubs, toasters, jukeboxes, etc.  See
    also: Management Information Base.
 SLIP
    See: Serial Line IP

User Glossary Working Group [Page 43] RFC 1392 Internet Glossary January 1993

 SMDS
    See: Switched Multimegabit Data Service
 SMI
    See: Structure of Management Information
 SMTP
    See: Simple Mail Transfer Protocol
 SNA
    See: Systems Network Architecture
 snail mail
    A pejorative term referring to the U.S. postal service.
 SNMP
    See: Simple Network Management Protocol
 STD
    A subseries of RFCs that specify Internet standards.  The official
    list of Internet standards is in STD 1.  See also: For Your
    Information, Request For Comments.
 stream-oriented
    A type of transport service that allows its client to send data in
    a continuous stream.  The transport service will guarantee that
    all data will be delivered to the other end in the same order as
    sent and without duplicates.  See also: Transmission Control
    Protocol.
    [Source: MALAMUD]
 Structure of Management Information (SMI)
    The rules used to define the objects that can be accessed via a
    network management protocol.  This protocol is defined in STD 16,
    RFC 1155.  See also: Management Information Base.
    [Source: RFC1208]
 stub network
    A stub network only carries packets to and from local hosts.  Even
    if it has paths to more than one other network, it does not carry
    traffic for other networks.  See also: backbone, transit network.
 subnet
    A portion of a network, which may be a physically independent
    network segment, which shares a network address with other
    portions of the network and is distinguished by a subnet number.
    A subnet is to a network what a network is to an internet.  See
    also: internet, network.

User Glossary Working Group [Page 44] RFC 1392 Internet Glossary January 1993

    [Source: FYI4]
 subnet address
    The subnet portion of an IP address.  In a subnetted network, the
    host portion of an IP address is split into a subnet portion and a
    host portion using an address (subnet) mask.  See also: address
    mask, IP address, network address, host address.
 subnet mask
    See: address mask
 subnet number
    See: subnet address
 Switched Multimegabit Data Service (SMDS)
    An emerging high-speed datagram-based public data network service
    developed by Bellcore and expected to be widely used by telephone
    companies as the basis for their data networks.  See also:
    Metropolitan Area Network.
    [Source: RFC1208]
 Systems Network Architecture (SNA)
    A proprietary networking architecture used by IBM and IBM-
    compatible mainframe computers.
    [Source: NNSC]
 T1
    An AT&T term for a digital carrier facility used to transmit a
    DS-1 formatted digital signal at 1.544 megabits per second.
 T3
    A term for a digital carrier facility used to transmit a DS-3
    formatted digital signal at 44.746 megabits per second.
    [Source: FYI4]
 TAC
    See: Terminal Access Controller (TAC)
 talk
    A protocol which allows two people on remote computers to
    communicate in a real-time fashion.  See also: Internet Relay
    Chat.
 TCP
    See: Transmission Control Protocol
 TCP/IP Protocol Suite
    Transmission Control Protocol over Internet Protocol.  This is a

User Glossary Working Group [Page 45] RFC 1392 Internet Glossary January 1993

    common shorthand which refers to the suite of transport and
    application protocols which runs over IP.  See also: IP, ICMP,
    TCP, UDP, FTP, Telnet, SMTP, SNMP.
 TELENET
    A public packet switched network using the CCITT X.25 protocols.
    It should not be confused with Telnet.
 Telnet
    Telnet is the Internet standard protocol for remote terminal
    connection service.  It is defined in STD 8, RFC 854 and extended
    with options by many other RFCs.
 Terminal Access Controller (TAC)
    A device which connects terminals to the Internet, usually using
    dialup modem connections and the TACACS protocol.
 terminal emulator
    A program that allows a computer to emulate a terminal.  The
    workstation thus appears as a terminal to the remote host.
    [Source: MALAMUD]
 terminal server
    A device which connects many terminals to a LAN through one
    network connection.  A terminal server can also connect many
    network users to its asynchronous ports for dial-out capabilities
    and printer access.  See also: Local Area Network.
 Three Letter Acronym (TLA)
    A tribute to the use of acronyms in the computer field.  See also:
    Extended Four Letter Acronym.
 Time to Live (TTL)
    A field in the IP header which indicates how long this packet
    should be allowed to survive before being discarded.  It is
    primarily used as a hop count.  See also: Internet Protocol.
    [Source: MALAMUD]
 TLA
    See: Three Letter Acronym
 TN3270
    A variant of the Telnet program that allows one to attach to IBM
    mainframes and use the mainframe as if you had a 3270 or similar
    terminal.
    [Source: BIG-LAN]

User Glossary Working Group [Page 46] RFC 1392 Internet Glossary January 1993

 token ring
    A token ring is a type of LAN with nodes wired into a ring.  Each
    node constantly passes a control message (token) on to the next;
    whichever node has the token can send a message.  Often, "Token
    Ring" is used to refer to the IEEE 802.5 token ring standard,
    which is the most common type of token ring.  See also: 802.x,
    Local Area Network.
 topology
    A network topology shows the computers and the links between them.
    A network layer must stay abreast of the current network topology
    to be able to route packets to their final destination.
    [Source: MALAMUD]
 transceiver
    Transmitter-receiver.  The physical device that connects a host
    interface to a local area network, such as Ethernet.  Ethernet
    transceivers contain electronics that apply signals to the cable
    and sense collisions.
    [Source: RFC1208]
 transit network
    A transit network passes traffic between networks in addition to
    carrying traffic for its own hosts.  It must have paths to at
    least two other networks.  See also: backbone, stub network.
 Transmission Control Protocol (TCP)
    An Internet Standard transport layer protocol defined in STD 7,
    RFC 793.  It is connection-oriented and stream-oriented, as
    opposed to UDP.  See also: connection-oriented, stream-oriented,
    User Datagram Protocol.
 Trojan Horse
    A computer program which carries within itself a means to allow
    the creator of the program access to the system using it.  See
    also: virus, worm.  See RFC 1135.
 TTFN
    Ta-Ta For Now
 TTL
    See: Time to Live
 tunnelling
    Tunnelling refers to encapsulation of protocol A within protocol
    B, such that A treats B as though it were a datalink layer.
    Tunnelling is used to get data between administrative domains
    which use a protocol that is not supported by the internet

User Glossary Working Group [Page 47] RFC 1392 Internet Glossary January 1993

    connecting those domains.  See also: Administrative Domain.
 twisted pair
    A type of cable in which pairs of conductors are twisted together
    to produce certain electrical properties.
 UDP
    See: User Datagram Protocol
 Universal Time Coordinated (UTC)
    This is Greenwich Mean Time.
    [Source: MALAMUD]
 UNIX-to-UNIX CoPy (UUCP)
    This was initially a program run under the UNIX operating system
    that allowed one UNIX system to send files to another UNIX system
    via dial-up phone lines.  Today, the term is more commonly used to
    describe the large international network which uses the UUCP
    protocol to pass news and electronic mail.  See also: Electronic
    Mail, Usenet.
 urban legend
    A story, which may have started with a grain of truth, that has
    been embroidered and retold until it has passed into the realm of
    myth.  It is an interesting phenonmenon that these stories get
    spread so far, so fast and so often.  Urban legends never die,
    they just end up on the Internet!  Some legends that periodically
    make their rounds include "The Infamous Modem Tax," "Craig
    Shergold/Brain Tumor/Get Well Cards," and "The $250 Cookie
    Recipe".
    [Source: LAQUEY]
 Usenet
    A collection of thousands of topically named newsgroups, the
    computers which run the protocols, and the people who read and
    submit Usenet news.  Not all Internet hosts subscribe to Usenet
    and not all Usenet hosts are on the Internet.  See also: Network
    News Transfer Protocol, UNIX-to-UNIX CoPy.
    [Source: NWNET]
 User Datagram Protocol (UDP)
    An Internet Standard transport layer protocol defined in STD 6,
    RFC 768.  It is a connectionless protocol which adds a level of
    reliability and multiplexing to IP.  See also: connectionless,
    Transmission Control Protocol.
 UTC
    See: Universal Time Coordinated

User Glossary Working Group [Page 48] RFC 1392 Internet Glossary January 1993

 UUCP
    See: UNIX-to-UNIX CoPy
 virtual circuit
    A network service which provides connection-oriented service
    regardless of the underlying network structure.  See also:
    connection-oriented.
 virus
    A program which replicates itself on computer systems by
    incorporating itself into other programs which are shared among
    computer systems.  See also: Trojan Horse, worm.
 W3
    See: World Wide Web
 WAIS
    See: Wide Area Information Servers
 WAN
    See: Wide area network
 WG
    Working Group
 white pages
    The Internet supports several databases that contain basic
    information about users, such as email addresses, telephone
    numbers, and postal addresses.  These databases can be searched to
    get information about particular individuals.  Because they serve
    a function akin to the telephone book, these databases are often
    referred to as "white pages.  See also: Knowbot, WHOIS, X.500.
 WHOIS
    An Internet program which allows users to query a database of
    people and other Internet entities, such as domains, networks, and
    hosts, kept at the DDN NIC.  The information for people shows a
    person's company name, address, phone number and email address.
    See also: Defense Data Network Network ..., white pages, Knowbot,
    X.500.
    [Source: FYI4]
 Wide Area Information Servers (WAIS)
    A distributed information service which offers simple natural
    language input, indexed searching for fast retrieval, and a
    "relevance feedback" mechanism which allows the results of initial
    searches to influence future searches.  Public domain
    implementations are available.  See also: archie, Gopher,

User Glossary Working Group [Page 49] RFC 1392 Internet Glossary January 1993

    Prospero.
 Wide Area Network (WAN)
    A network, usually constructed with serial lines, which covers a
    large geographic area.  See also: Local Area Network, Metropolitan
    Area Network.
 World Wide Web (WWW or W3)
    A hypertext-based, distributed information system created by
    researchers at CERN in Switzerland.  Users may create, edit or
    browse hypertext documents.  The clients and servers are freely
    available.
 worm
    A computer program which replicates itself and is self-
    propagating.  Worms, as opposed to viruses, are meant to spawn in
    network environments.  Network worms were first defined by Shoch &
    Hupp of Xerox in ACM Communications (March 1982).  The Internet
    worm of November 1988 is perhaps the most famous; it successfully
    propagated itself on over 6,000 systems across the Internet.  See
    also: Trojan Horse, virus.
 WRT
    With Respect To
 WWW
    See: World Wide Web
 WYSIWYG
    What You See is What You Get
 X
    X is the name for TCP/IP based network-oriented window systems.
    Network window systems allow a program to use a display on a
    different computer.   The most widely-implemented window system is
    X11 - a component of MIT's Project Athena.
 X.25
    A data communications interface specification developed to
    describe how data passes into and out of public data
    communications networks.  The CCITT and ISO approved protocol
    suite defines protocol layers 1 through 3.
 X.400
    The CCITT and ISO standard for electronic mail.  It is widely used
    in Europe and Canada.

User Glossary Working Group [Page 50] RFC 1392 Internet Glossary January 1993

 X.500
    The CCITT and ISO standard for electronic directory services.  See
    also: white pages, Knowbot, WHOIS.
 XDR
    See: eXternal Data Representation
 Xerox Network System (XNS)
    A network developed by Xerox corporation.  Implementations exist
    for both 4.3BSD derived systems, as well as the Xerox Star
    computers.
 XNS
    See: Xerox Network System
 Yellow Pages (YP)
    A service used by UNIX administrators to manage databases
    distributed across a network.
 YP
    See: Yellow Pages
 zone
    A logical group of network devices (AppleTalk).

User Glossary Working Group [Page 51] RFC 1392 Internet Glossary January 1993

References

 BIG-LAN "BIG-LAN Frequently Asked Questions Memo", BIG-LAN DIGEST
         V4:I8, February 14, 1992.
 COMER   Comer, D., "Internetworking with TCP/IP: Principles,
         Protocols and Architecture", Prentice Hall, Englewood Cliffs,
         NJ, 1991.
 FYI4    Malkin, G., and A. Marine, "FYI on Questions and Answers:
         Answers to Commonly asked "New Internet User" Questions", FYI
         4, RFC 1325, Xylogics, SRI, May 1992.
 HACKER  "THIS IS THE JARGON FILE", Version 2.9.8, January 1992.
 HPCC    "Grand Challenges 1993: High Performance Computing and
         Communications", Committee on Physical, Mathmatical and
         Engineering Sciences of the Federal Coordinating Council for
         Science, Engineering and Technology.
 MALAMUD Malamud, C., "Analyzing Sun Networks", Van Nostrand Reinhold,
         New York, NY, 1992.
 NNSC    "NNSC's Hypercard Tour of the Internet".
 LAQUEY  LaQuey, T. (with J. Ryer), "The Internet Companion: A
         Beginner's Guide to Global Networking", Addison-Wesley,
         Reading, MA, 1992.
 NWNET   Kochmer, J., and NorthWestNet, "The Internet Passport:
         NorthWestNets Guide to Our World Online", NorthWestNet,
         Bellevue, WA, 1992.
 RFC1208 Jacobsen, O., and D. Lynch, "A Glossary of Networking Terms",
         RFC 1208, Interop, Inc., March 1991.
 STD1    Postel, J., "IAB Official Protocol Standards", STD 1, RFC
         1360, Internet Architecture Board, September 1992.
 STD2    Reynolds, J., and J. Postel, "Assigned Numbers", STD 2, RFC
         1340, USC/Information Sciences Institute, July 1992.
 TAN     Tanenbaum, A., "Computer Networks; 2nd ed.", Prentice Hall,
         Englewood Cliffs, NJ, 1989.
 ZEN     Kehoe, B., "Zen and the Art of the Internet", February 1992.

User Glossary Working Group [Page 52] RFC 1392 Internet Glossary January 1993

Security Considerations

 While security is not explicitly discussed in this document, some of
 the glossary's entries are security related.  See the entries for
 Access Control List (ACL), authentication, Computer Emergency
 Response Team (CERT), cracker, Data Encryption Key (DEK), Data
 Encryption Standard (DES), encryption, Kerberos, Privacy Enhanced
 Mail (PEM), Trojan Horse, virus, and worm.

Authors' Addresses

 Gary Scott Malkin
 Xylogics, Inc.
 53 Third Avenue
 Burlington, MA 01803
 Phone:  (617) 272-8140
 EMail:  gmalkin@Xylogics.COM
 Tracy LaQuey Parker
 University of Texas at Austin
 Computation Center
 Austin, TX 78712
 Phone: (512) 471-2444
 EMail: tracy@utexas.edu

User Glossary Working Group [Page 53]

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