GL-5
Cisco Router and Security Device Manager Version 2.2 User’s Guide
OL-4015-08
Glossary
CHAP Challenge Handshake Authentication Protocol. Security feature supported on
lines using PPP encapsulation that prevents unauthorized access. CHAP does not
itself prevent unauthorized access, it merely identifies the remote end. The
router or access server then determines whether that user is allowed access. See
also PAP.
chargen Character Generation. Via TCP, a service that sends a continual stream of
characters until stopped by the client. Via UDP, the server sends a random
number of characters each time the client sends a datagram.
checksum Computational method for checking the integrity of transmitted data, computed
from a sequence of octets taken through a series of arit hmetic operations. The
recipient recomputes the value and compares it for verification.
cipher An encryption-decryption algorithm.
ciphertext Encrypted, unreadable data, prior to its decryption .
clear channel A clear channel is one through which non-encrypted traffic can flow. Clear
channels place no security restrictions on transmitted data.
cleartext Decrypted text. Also called plaintext.
CLI command-line interface. The primary interface for entering configuration and
monitoring commands to the router. Refer to the Configuration Guide for the
router you are configuring for information on what c ommands you can enter
from the CLI.
client/server
computing
Term used to describe distributed computing (processing) network systems in
which transaction responsibilities are divided into two parts: client (front end)
and server (back end). Also called distributed computing. See also RPC.
CNS Cisco Networking Services. A suite of services that support scalable network
deployment, configuration, service-assurance monitoring, and service delivery.
comp-lzs An IP compression algorithm.
Configuration,
Config, Config File
The file on the router that holds the settings, preferences, and properties you can
administer using SDM.