The AAA server is not configured with a unique key to be used for communication (i.e. RADIUS, TACACS+) with any client requesting authentication services.

Using standardized authentication protocols such as RADIUS, TACACS+, and Kerberos, an authentication server provides centralized and robust authentication services for the management of network components. An authentication server is very scalable as it supports many user accounts and authentication sessions with the network components. It is critical that the AAA server’s operating system is secured and other methods are used to ensure that the server is not compromised.