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What is the PRIMARY advantage of using a separate authentication server (e.g., Remote Access Dial-In User System, Terminal Access Controller Access Control System) to authenticate dial-in users?
Call-back is very difficult to defeat.
Single user logons are easier to manage and audit.
Each session has a unique (one-time) password assigned to it.
Audit and access information are not kept on the access server.
TACACS integrates the authentication and authorization processes. XTACACS keeps the authentication, authorization and accounting processes separate. TACACS+ improves XTACACS by adding two-factor authentication.
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