Glossary
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RAM
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.
RARP
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.
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 point
Used to define an area in an ISDN network. Providers
used these reference points to find problems in the ISDN network.
reliability
The measure of the quality of a connection. It is one of the met-
rics that can be used to make routing decisions.
reload
An event or command that causes Cisco routers to reboot.
remote access
A generic term that defines connectivity to distant
resources using one of many technologies, as appropriate.
remote services
Remote services are defined as network services close to
users but not on the same network or subnet as the users. The users would
have to cross a layer 3 device to communicate with the network services, but
they might not have to cross the backbone.
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