Appendix A
A.1 Glossary of Terms
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CCA
Clear Channel Assessment. In wireless networks, the CCA method detects if
a channel is occupied or clear, and determines if the channel is available for
data transmission.
CDP
Cisco Discovery Protocol. CDP is a proprietary Data Link Layer protocol de-
veloped by Cisco Systems. CDP runs on Cisco devices and enables net-
working applications to learn about the neighboring devices directly
connected to the network.
CDR
Call Detail Record. A CDR contains the details of a telephone or VoIP call,
such as the origin and destination addresses of the call, the start time and
end time of the call, any toll charges that were added through the network or
charges for operator services, and so on.
CEF
Common Event Format. The CEF is a standard for the interoperability of
event or log-generating devices and applications. The standard syntax for
CEF includes a prefix and a variable extension formatted as key-value pairs.
CGI
Common Gateway Interface. CGI is a standard protocol for exchanging data
between the web servers and executable programs running on a server to
dynamically process web pages.
CHAP
Challenge Handshake Authentication Protocol. CHAP is an authentication
scheme used by PPP servers to validate the identity of remote clients.
CIDR
Classless Inter-Domain Routing. CIDR is an IP standard for creating and
allocating unique identifiers for networks and devices. The CIDR IP address-
ing scheme is used as a replacement for the older IP addressing scheme
based on classes A, B, and C. With CIDR, a single IP address can be used
to designate many unique IP addresses. A CIDR IP address ends with a
slash followed by the IP network prefix, for example, 192.0.2.0/24.
ClearPass
ClearPass is an access management system for creating and enforcing poli-
cies across a network to all devices and applications. The ClearPass inte-
grated platform includes applications such as Policy Manager, Guest,
Onboard, OnGuard, Insight, Profile, QuickConnect, and so on.
ClearPass
Guest
ClearPass Guest is a configurable ClearPass application for secure visitor
network access management.
ClearPass
Policy Manag-
er
ClearPass Policy Manager is a baseline platform for policy management,
AAA, profiling, network access control, and reporting. With ClearPass Policy
Manager, the network administrators can configure and manage secure net-
work access that accommodates requirements across multiple locations and
multivendor networks, regardless of device ownership and connection meth-
od.
CLI
Command-Line Interface. A console interface with a command line shell that
allows users to execute text input as commands and convert these com-
mands to appropriate functions.
CN
Common Name. CN is the primary name used to identify a certificate.
CNA
Captive Network Assistant. CNA is a popup page shown when joining a net-
work that has a captive portal.
CoA
Change of Authorization. The RADIUS CoA is used in the AAA service
framework to allow dynamic modification of the authenticated, authorized,
and active subscriber sessions.
