Glossary Terms - I

ISDN (Integrated Services Digital Network)
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. [Source: RFC 1208]
IGP (Interior Gateway Protocol)
The protocol used to exchange routing information between collaborating routers in the Internet. RIP and OSPF are examples of IGPs. [Source: RFC 1208]
intermediate system (intermediate system)
An OSI system which is not an end system, but which serves instead to relay communications between end systems. See repeater, bridge, and router. [Source: RFC 1208]
IS-IS (Intermediate system to Intermediate system protocol)
The OSI protocol by which intermediate systems exchange routing information. [Source: RFC 1208]
IONL (Internal Organization of the Network Layer)
The OSI standard for the detailed architecture of the Network Layer. Basically, it partitions the Network layer into subnetworks interconnected by convergence protocols (equivalent to internetworking protocols), creating what Internet calls a catenet or internet. [Source: RFC 1208]
CCITT (International Consultative Committee for Telegraphy and Telephony)
A unit of the International Telecommunications Union (ITU) of the United Nations. An organization with representatives from the PTTs of the world. CCITT produces technical standards, known as "Recommendations," for all internationally controlled aspects of analog and digital communications. See X Recommendations. [Source: RFC 1208]
ISO (International Organization for Standardization)
You knew that, right? Best known for the 7-layer OSI Reference Model. See OSI. [Source: RFC 1208]
Internet (Internet)
(note the capital "I") The largest internet in the world consisting of large national backbone nets (such as MILNET, NSFNET, and CREN) and a myriad of regional and local campus networks all over the world. The Internet uses the Internet protocol suite. To be on the Internet you must have IP connectivity, i.e., be able to Telnet to--or ping--other systems. Networks with only e-mail connectivity are not actually classified as being on the Internet. [Source: RFC 1208]
internet (internet)
A collection of networks interconnected by a set of routers which allow them to function as a single, large virtual network. [Source: RFC 1208]
IAB (Internet Activities Board)
The technical body that oversees the development of the Internet suite of protocols (commonly referred to as "TCP/IP"). It has two task forces (the IRTF and the IETF) each charged with investigating a particular area. [Source: RFC 1208]
Internet address (Internet address)
A 32-bit address assigned to hosts using TCP/IP. See dotted decimal notation. [Source: RFC 1208]
ICMP (Internet Control Message Protocol)
The protocol used to handle errors and control messages at the IP layer. ICMP is actually part of the IP protocol. [Source: RFC 1208]
IESG (Internet Engineering Steering Group)
The executive committee of the IETF. [Source: RFC 1208]
IETF (Internet Engineering Task Force)
One of the task forces of the IAB. The IETF is responsible for solving short-term engineering needs of the Internet. It has over 40 Working Groups. [Source: RFC 1208]
IGRP (Internet Gateway Routing Protocol)
A proprietary IGP used by cisco System's routers. [Source: RFC 1208]
IP (Internet Protocol)
The network layer protocol for the Internet protocol suite. [Source: RFC 1208]
IRTF (Internet Research Task Force)
One of the task forces of the IAB. The group responsible for research and development of the Internet protocol suite. [Source: RFC 1208]
INTAP (Interoperability Technology Association for Information Processing)
The technical organization which has the official charter to develop Japanese OSI profiles and conformance tests. [Source: RFC 1208]
IP datagram (IP datagram)
The fundamental unit of information passed across the Internet. Contains source and destination addresses along with data and a number of fields which define such things as the length of the datagram, the header checksum, and flags to say whether the datagram can be (or has been) fragmented. [Source: RFC 1208]
ISODE (ISO Development Environment)
A popular implementation of the upper layers of OSI. Pronounced eye-so-dee-eee. [Source: RFC 1208]

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