The three versions of Terminal Access Controller Access Control System (TACACS) are: TACACS, Extended TACACS (XTACACS), and TACACS+. Each version authenticates users and prohibits access to those without a verified username/password pairing.

  • TACACS combines the authentication and authorization functions.
  • XTACACS allows the separation of the authentication, authorization, and auditing functions, giving administrators more discerning control over its deployment.
  • TACACS+ also allows the division of the authentication, authorization, and auditing but also provides two-factor authentication.

The authentication process with TACACS is similar to RADIUS and it parallels in functionality. However, RADIUS follows an Internet standard, and TACACS is a proprietary protocol. This difference has made TACACS less popular than RADIUS.

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