rfc1983.txt

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Network Working Group                                  G. Malkin, Editor
Request for Comments: 1983                                      Xylogics
FYI: 18                                                      August 1996
Obsoletes: 1392
Category: Informational


                        Internet Users' Glossary


Status of this Memo

   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  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.  I would
   especially like to thank Ryan Moats/InterNIC for his careful review
   and many contributions to this document.


Table of Contents

   non-letter  . .  2      I . . . . . . . 26      R . . . . . . . 46
   A . . . . . . .  2      J . . . . . . . 33      S . . . . . . . 49
   B . . . . . . .  7      K . . . . . . . 33      T . . . . . . . 52
   C . . . . . . . 10      L . . . . . . . 33      U . . . . . . . 55
   D . . . . . . . 14      M . . . . . . . 35      V . . . . . . . 57
   E . . . . . . . 18      N . . . . . . . 39      W . . . . . . . 57
   F . . . . . . . 20      O . . . . . . . 42      X . . . . . . . 59
   G . . . . . . . 22      P . . . . . . . 43      Y . . . . . . . 60
   H . . . . . . . 23      Q . . . . . . . 46      Z . . . . . . . 60

   References  . . . . . . . . . . . . . . . . . . . . . . . . . . 61
   Security Considerations . . . . . . . . . . . . . . . . . . . . 62
   Editor's Address  . . . . . . . . . . . . . . . . . . . . . . . 62



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RFC 1983                        Glossary                     August 1996


Glossary

   10Base2
      A physical layer communications specification for 10Mbps, baseband
      data transmission over a coaxial cable (Thinnet) with a maximum
      cable segment length of 200 meters.

   10Base5
      A physical layer communications specification for 10Mbps, baseband
      data transmission over a coaxial cable (Thicknet) with a maximum
      cable segment length of 500 meters.

   10BaseF
      A physical layer communications specification for 10Mbps, baseband
      data transmission over a fiber-optic cable.

   10BaseT
      A physical layer communications specification for 10Mbps, baseband
      data transmission over a twisted-pair copper wire.

   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.





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RFC 1983                        Glossary                     August 1996


   Acceptable Use Policy (AUP)
      Many transit networks have policies which restrict the use to
      which the network may be put.  For example, some networks may only
      be used for non-commercial purposes.  Some AUPs limit the type of
      material which can be made available to the public (e.g.,
      pornographic material).  Enforcement of AUPs varies with the
      network.  See also: netiquette.

   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

   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 four types of addresses in common use within the
      Internet.  They are email address; IP, internet or Internet
      address; hardware or MAC address; and URL.  See also: email
      address, IP address, internet address, MAC address, Uniform
      Resource Locator.

   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 (i.e., the network mask) can be determined by the
      encoding inherent in an IP address.  See also: Classless Inter-
      domain Routing.







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RFC 1983                        Glossary                     August 1996


   address resolution
      Conversion of a network-layer address (e.g. IP address) into the
      corresponding physical address (e.g., MAC address).  See also: IP
      address, MAC 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.  See also: proxy ARP, Reverse Address Resolution
      Protocol.

   Administrative Domain (AD)
      A collection of hosts and routers, and the interconnecting
      network(s), managed by a single administrative authority.

   Advanced Research Projects Agency (ARPA)
      An agency of the U.S. Department of Defense responsible for the
      development of new technology for use by the military.  ARPA
      (formerly known as DARPA, nee 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]

   Advanced Research Projects Agency Network (ARPANET)
      A pioneering longhaul network funded by ARPA.  Now retired, 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: Advanced Research
      Projects Agency.
      [Source: FYI4]

   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



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      (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, World Wide Web.

   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
      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]




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RFC 1983                        Glossary                     August 1996


   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.  For example, an anonymous FTP archive site provides
      access to arcived material via the FTP protocol.  WWW servers can
      also serve as archive sites.  See also: anonymous FTP, archie,
      Gopher, Prospero, Wide Area Information Servers, World Wide Web.

   ARP
      See: Address Resolution Protocol

   ARPA
      See: 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
      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]







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   Asynchronous Transfer Mode (ATM)
      A standard which defines high-load, high-speed (1.544Mbps through