intermediate routing node
- See IRN.
Intermediate Session Routing
- See ISR.
- See IS.
Intermediate System-to-Intermediate System
- See IS-IS.
International Code Designator
- See ICD.
International Data Number
- See X.121.
International Electrotechnical Commission
- See IEC.
International Federation for Information Processing
- See IFIP.
International Organization for Standardization
- See ISO.
International Standards Organization
- Erroneous expansion of the acronym ISO. See ISO.
International Telecommunication Union Telecommunication Standardization Sector
- See ITU-T.
- Term used to refer to the largest global internetwork, connecting tens of thousands of networks worldwide and having a "culture" that focuses on research and standardization based on real-life use. Many leading-edge network technologies come from the Internet community. The Internet evolved in part from ARPANET. At one time, called the DARPA Internet. Not to be confused with the general term internet. See also ARPANET.
- Short for internetwork. Not to be confused with the Internet. See internetwork.
Internet Architecture Board
- See IAB.
- See IP address.
Internet Assigned Numbers Authority
- See IANA.
Internet Control Message Protocol
- See ICMP.
Internet Engineering Steering Group
- See IESG.
Internet Engineering Task Force
- See IETF.
Internet Group Management Protocol
- See IGMP.
Internet Network Operations Center
- See INOC.
- See IP.
- Any protocol that is part of the TCP/IP protocol stack. See TCP/IP.
Internet Research Steering Group
- See IRSG.
Internet Research Task Force
- See IRTF.
- See ISOC.
- Collection of networks interconnected by routers and other devices that functions (generally) as a single network. Sometimes called an internet, which is not to be confused with the Internet.
- General term used to refer to the industry that has arisen around the problem of connecting networks together. The term can refer to products, procedures, and technologies.
Internetwork Packet Exchange
- See IPX.
- Ability of computing equipment manufactured by different vendors to communicate with one another successfully over a network.
Inter-Switching System Interface
- See ISSI.
- Term used to describe routing within a logical area. Compare with interarea routing.
Inverse Address Resolution Protocol
- See Inverse ARP.
- Inverse Address Resolution Protocol. Method of building dynamic routes in a network. Allows an access server to discover the network address of a device associated with a virtual circuit.
- See Cisco IOS software.
- Internet Protocol. Network layer protocol in the TCP/IP stack offering a connectionless internetwork service. IP provides features for addressing, type-of-service specification, fragmentation and reassembly, and security. Documented in RFC 791.
- 32-bit address assigned to hosts using TCP/IP. An IP address belongs to one of five classes (A, B, C, D, or E) and is written as 4 octets separated with periods (dotted decimal format). Each address consists of a network number, an optional subnetwork number, and a host number. The network and subnetwork numbers together are used for routing, while the host number is used to address an individual host within the network or subnetwork. A subnet mask is used to extract network and subnetwork information from the IP address. Also called an Internet address. See also IP and subnet mask.
- Routing technique that allows IP traffic to be propagated from one source to a number of destinations or from many sources to many destinations. Rather than sending one packet to each destination, one packet is sent to a multicast group identified by a single IP destination group address.
IP Security Option
- See IPSO.
- IP Security Option. U.S. government specification that defines an optional field in the IP packet header that defines hierarchical packet security levels on a per interface basis.
- Internetwork Packet Exchange. NetWare network layer (Layer 3) protocol used for transferring data from servers to workstations. IPX is similar to IP and XNS.
- Protocol that negotiates end-to-end options for new links. When a link comes up, the first IPX packets sent across are IPXWAN packets negotiating the options for the link. When the IPXWAN options have been successfully determined, normal IPX transmission begins. Defined by RFC 1362.
- ICMP Router Discovery Protocol. Enables a host to determine the address of a router that it can use as a default gateway. Similar to ESIS, but used with IP. See also ES-IS.
- intermediate routing node. In SNA, a subarea node with intermediate routing capability.
- Internet Research Steering Group. Group that is part of the IAB and oversees the activities of the IRTF. See also IAB and IRTF.
- Internet Research Task Force. Community of network experts that consider Internet-related research topics. The IRTF is governed by the IRSG and is considered a subsidiary of the IAB. See also IAB and IRSG.
- intermediate system. Routing node in an OSI network.
- Industry-Standard Architecture. 16-bit bus used for Intel-based personal computers. See also EISA.
isarithmic flow control
- Flow control technique in which permits travel through the network. Possession of these permits grants the right to transmit. Isarithmic flow control is not commonly implemented.
- Integrated Services Digital Network. Communication protocol, offered by telephone companies, that permits telephone networks to carry data, voice, and other source traffic. See also BISDN, BRI, N-ISDN, and PRI.
- Intermediate System-to-Intermediate System. OSI link-state hierarchical routing protocol based on DECnet Phase V routing whereby ISs (routers) exchange routing information based on a single metric to determine network topology. Compare with Integrated IS-IS. See also ES-IS and OSPF.
- See IIH.
IS-IS Interdomain Routing Protocol
- See IDRP.
- International Organization for Standardization. International organization that is responsible for a wide range of standards, including those relevant to networking. ISO developed the OSI reference model, a popular networking reference model.
- HDLC procedures developed by ISO. ISO 3309:1979 specifies the HDLC frame structure for use in synchronous environments. ISO 3309:1984 specifies proposed modifications to allow the use of HDLC in asynchronous environments as well.
- Set of international quality-management standards defined by ISO. The standards, which are not specific to any country, industry, or product, allow companies to demonstrate that they have specific processes in place to maintain an efficient quality system.
- Internet Society. International nonprofit organization, founded in 1992, that coordinates the evolution and use of the Internet. In addition, ISOC delegates authority to other groups related to the Internet, such as the IAB. ISOC is headquartered in Reston, Virginia, U.S.A. See also IAB.
- Asynchronous transmission over a synchronous data link. Isochronous signals require a constant bit rate for reliable transport. Compare with asynchronous transmission, plesiochronous transmission, and synchronous transmission.
- ISO development environment. Large set of libraries and utilities used to develop upper-layer OSI protocols and applications.
ISO development environment
- See ISODE.
- Intermediate Session Routing. Initial routing algorithm used in APPN. ISR provides node-to-node connection-oriented routing. Network outages cause sessions to fail because ISR cannot provide nondisruptive rerouting around a failure. ISR has been replaced by HPR. Compare with HPR. See also APPN.
- Inter-Switching System Interface. Standard interface between SMDS switches.
- International Telecommunication Union Telecommunication Standardization Sector (ITU-T) (formerly the Committee for Internatiional Telegraph and Telephone ([CCITT]). An international organization that develops communication standards. See also CCITT.