50 CHAPTER 3: MANAGING DEVICE SECURITY
Defining TACACS+
Authentication
Terminal Access Controller Access Control System (TACACS+) provides
centralized security user access validation. The system supports up-to 4
TACACS+ servers. TACACS+ provides a centralized user management
system, while still retaining consistency with RADIUS and other
authentication processes. TACACS+ provides the following services:
■ Authentication — Provides authentication during login and via user
names and user-defined passwords.
■ Authorization — Performed at login. Once the authentication
session is completed, an authorization session starts using the
authenticated user name.
The TACACS+ protocol ensures network integrity through encrypted
protocol exchanges between the client and TACACS+ server.
The TACACS+ default parameters are user-assigned defaults. The default
settings are applied to newly defined TACACS+ servers. If default values
are not defined, the system defaults are applied to the new TACACS+
new servers.
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