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Glossary

473

inter-area routing

Routing between two or more logical areas. Contrast

with: intra-area routing. See also: area.

interface processor

Any of several processor modules used with Cisco 7000

series routers. See also: AIP, CIP, EIP, FEIP, HIP, MIP, and TRIP.

Interior Gateway Routing Protocol (IGRP)

Cisco proprietary distance-

vector protocol.

internal route processors

Route Switch Modules (RSM) and Route

Switch Feature Cards (RSFC) are called internal route processors because the
processing of Layer 3 packets is internal to a switch.

Internet

The global "network of networks," whose popularity has

exploded in the last few years. Originally a tool for collaborative academic
research, it has become a medium for exchanging and distributing informa-
tion of all kinds. The Internet's need to link disparate computer platforms
and technologies has led to the development of uniform protocols and stan-
dards that have also found widespread use within corporate LANs. See also:
TCP/IP and MBONE.

internet

Before the rise in the use of the Internet, this lowercase form was

shorthand for "internetwork" in the generic sense. Now rarely used. See
also: internetwork.

Internet Protocol

Any protocol belonging to the TCP/IP protocol stack.

See also: TCP/IP.

internetwork

Any group of private networks interconnected by routers

and other mechanisms, typically operating as a single entity.

internetworking

Broadly, anything associated with the general task of

linking networks to each other. The term encompasses technologies, proce-
dures, and products. When you connect networks to a router, you are cre-
ating an internetwork.

inter-VLAN routing

Cisco has created the proprietary protocol Inter-

Switch Link (ISL) to allow routing between VLANs with only one Ethernet
interface. To run ISL, you need to have two VLAN-capable Fast Ethernet or
Gigabit Ethernet devices like a Cisco 5000 switch and a 7000 series router.

www.sybex.com