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R reference point
Used with ISDN networks to identify the connection
between an NT1 and an S/T device. The S/T device converts the four-wire
network to the two-wire ISDN standard network.
Remote Access Dial-in User Service: A protocol that is used to
communicate between the remote access device and an authentication
server. Sometimes an authentication server running RADIUS will be called a
RADIUS server.
random access memory: Used by all computers to store information.
Cisco routers use RAM to store packet buffers and routing tables, along with
the hardware addresses cache.
Reverse Address Resolution Protocol: The protocol within the TCP/
IP stack that maps MAC addresses to IP addresses. See also: ARP.
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.
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.
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.
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 point
Used to define an area in an ISDN network. Providers
used these reference points to find problems in the ISDN network.
relay system
Another term for a router.
The measure of the quality of a connection. It is one of the met-
rics that can be used to make routing decisions.
Copyright ©2001 SYBEX , Inc., Alameda, CA