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Glossary: CCNA & General Networking Terms 


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Remote Authentication Dial In User Service is a protocol which allows an Authentication Server to authenticate, authorise and carry configuration information for one or more Network Access servers. These have links, typically for dialup access clients, that need authentication. This allows username and password information to be held in one place for many access lines. The current definition of RADIUS is in RFC 2865 and RFC 2866 for accounting (originally in RFC 2058 and RFC 2059 respectively) with several others for extensions, such as IP Version 6 at RFC 3162.
a package for the PC allowing file transfer and terminal access between Ethernet based PCs and Ethernet or X25 based hosts, via Coloured Book protocols, running over Pink Book protocol. Written by Edinburgh University. Of historical interest.
See: Reseaux Associes pour la Recherche Europeenne
See: Reverse Address Resolution Protocol
Real-time Blackhole List, a MAPS service for blocking electronic mail from rogue mail relays.
Regional Bell Operating Company [Source: RFC1392]
See: Remote copy program
Regional Distribution Network, a sort of organisation for a Metropolitan Area Network. See also RPAN.
Read the Fine Manual (RTFM)
This acronym is often used when someone asks a simple or common question. Replace "Fine" with a more vulgar word if desired.
Read the Source Code (RTSC)
This acronym is often used when a software developer asks a question about undocumented code. [Source: RFC1983]
The IP process in which a previously fragmented packet is reassembled before being passed to the transport layer. See also: fragmentation. [Source: RFC1392]
The facility of a programming language to be able to call functions from within themselves.
See: recursive [Source: RFC1392]
Red Book
Red Book Job Transfer and Manipulation Protocol; a JTMP used in the UK academic and research community. See also JTMP.
See: mid-level network. [Source: RFC1392]
remote login
Operating on a remote computer, using a protocol over a computer network, as though locally attached. See also: Telnet. [Source: RFC1392]
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]
A device which propagates electrical signals from one cable to another. See also: bridge, gateway, router. [Source: RFC1392]
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: BCP, For Your Information, STD. [Source: RFC1392]
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. [Source: RFC1392]
Translate an Internet name into its equivalent IP address or other DNS information.
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. [Source: RFC1392]
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]
RFD (Request For Discussion)
Usually a two- to three-week period in which the particulars of newsgroup creation are battled out.
See: Routing Information Protocol
Regulation of Investigatory Powers Act.
See: Reseaux IP Europeenne
Remote Job Entry.
A service offered by Berkeley UNIX which allows users of one machine to log into other UNIX systems (for which they are authorized) and interact as if their terminals were connected directly. Similar to Telnet. [Source: RFC1208]
Remote Operations Service Element. A lightweight RPC protocol, used in OSI Message Handling, Directory, and Network Management application protocols. [Source: RFC1208]
Round-Trip Time (RTT)
A measure of the current delay on a network. [Source: MALAMUD]
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. [Source: RFC1392]
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. [Source: RFC1392]
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. [Source: RFC1392]
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. [Source: RFC1392]
routing domain
A set of routers exchanging routing information within an administrative domain. See also: Administrative Domain, router. [Source: RFC1392]
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.... [Source: RFC1392]
Regional Partner Academic Network - a sort of organisation for a Metropolitan Area Network. See also RDN.
See: Remote Procedure Call
A public-key cryptographic system which may be used for encryption and authentication. It was invented in 1977 and named for its inventors: Ron Rivest, Adi Shamir, and Leonard Adleman. See also: encryption, Data Encryption Standard, Pretty Good Privacy. [Source: RFC1983]
Regional Support Centre, a JISC-sponsored service to further (and higher) education institutions.
Relay Spam Stopper, a method of rejecting electronic mail from rogue mail relays.
See: Read the Fine Manual
See: Read the Source Code
Reliable Transfer Service Element. A lightweight OSI application service used above X.25 networks to handshake application PDUs across the Session Service and TP0. Not needed with TP4, and not recommended for use in the U.S. except when talking to X.400 ADMDs. [Source: RFC1208]
See: Round-Trip Time


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