CCNA Cisco Certified Network Associate Study Guide - FTP Server

Glossary 665
classless routing Routing that sends subnet mask information in the
routing updates. Classless routing allows Variable-Length Subnet Mask
(VLSM) and supernetting. Routing protocols that support classless routing
are RIP version 2, EIGRP, and OSPF.
CLI Command-Line Interface: Allows you to configure Cisco routers and
switches with maximum flexibility.
CLP Cell Loss Priority: The area in the ATM cell header that determines
the likelihood of a cell being dropped during network congestion. Cells with
CLP = 0 are considered insured traffic and are not apt to be dropped. Cells
with CLP = 1 are considered best-effort traffic that may be dropped during
congested episodes, delivering more resources to handle insured traffic.
CLR Cell Loss Ratio: The ratio of discarded cells to successfully delivered
cells in ATM. CLR can be designated a QoS parameter when establishing a
connection.
CO Central Office: The local telephone company office where all loops in
a certain area connect and where circuit switching of subscriber lines occurs.
collapsed backbone A nondistributed backbone where all network segments
are connected to each other through an internetworking device. A collapsed
backbone can be a virtual network segment at work in a device such
as a router, hub, or switch.
collision The effect of two nodes sending transmissions simultaneously in
Ethernet. When they meet on the physical media, the frames from each node
collide and are damaged. See also: collision domain.
collision domain The network area in Ethernet over which frames that
have collided will spread. Collisions are propagated by hubs and repeaters,
but not by LAN switches, routers, or bridges. See also: collision.
composite metric Used with routing protocols, such as IGRP and EIGRP,
that use more than one metric to find the best path to a remote network.
IGRP and EIGRP both use bandwidth and delay of the line by default. However,
Maximum Transmission Unit (MTU), load, and reliability of a link can
be used as well.