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Glossary

RARP

Reverse Address Resolution Protocol: The protocol within the TCP/

IP stack that maps MAC addresses to IP addresses. See also: ARP.

RARP server

A Reverse Address Resolution Protocol server is used to pro-

vide an IP address from a known MAC address.

rate queue

A value, assigned to one or more virtual circuits, that specifies

the speed at which an individual virtual circuit will transmit data to the
remote end. Every rate queue identifies a segment of the total bandwidth
available on an ATM link. The sum of all rate queues should not exceed the
total available bandwidth.

RCP

Remote Copy Protocol: A protocol for copying files to or from a file

system that resides on a remote server on a network, using TCP to guarantee
reliable data delivery.

redistribution

Command used in Cisco routers to inject the paths found

from one type of routing protocol into another type of routing protocol. For
example, networks found by RIP can be inserted into an IGRP network.

redundancy

In internetworking, the duplication of connections, devices,

or services that can be used as a backup in the event that the primary con-
nections, devices, or services fail.

reference model

Used by application developers to create applications

that work on any type of network. The most popular reference model is the
Open Systems Interconnection (OSI) model.

reload

An event or command that causes Cisco routers to reboot.

RIF

Routing Information Field: In source-route bridging, a header field that

defines the path direction of the frame or token. If the Route Information Indi-
cator (RII) bit is not set, the RIF is read from source to destination (left to
right). If the RII bit is set, the RIF is read from the destination back to the
source, so the RIF is read right to left. It is defined as part of the Token Ring
frame header for source-routed frames, which contains path information.

ring

Two or more stations connected in a logical circular topology. In this

topology, which is the basis for Token Ring, FDDI, and CDDI, information
is transferred from station to station in sequence.

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