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TABLE 15-2. Policy Server for Cisco NAC Terms (Continued)
TERM DEFINITION
Authentication
,
Authorization,
and
Accounting
(AAA)
Certificate
Authority (CA)
Digital
Certificates
Remote
Authentication
Dial-In User
Service
(RADIUS)
Terminal
Access
Controller
Access
Control
System
(TACACS+)
Using Policy Server for Cisco NAC
Describes the three main services used to control end-user
client access to computer resources. Authentication refers to
identifying a client, usually by having the user enter a user
name and password. Authorization refers to the privileges the
user has to issue certain commands. Accounting refers to a
measurement, usually kept in logs, of the resources utilized
during a session. The Cisco Secure Access Control Server
(ACS) is the Cisco implementation of an AAA server.
An authority on a network that distributes digital certificates
for the purposes of performing authentication and securing
connections between computers and/or servers.
An attachment used for security. Most commonly, certificates
authenticate clients with servers, such as a web server, and
contain the following: user identity information, a public key
(used for encryption), and a digital signature of a Certificate
authority (CA) to verify that the certificate is valid.
An authentication system requiring clients to enter a user
name and password. Cisco Secure ACS servers support
RADIUS.
A security protocol enabled through AAA commands used for
authenticating end-user clients. Cisco ACS servers support
TACACS+.
15-5