TACACS

In spite of its name, TACACS+ is an entirely new protocol. TACACS+ and RADIUS have generally replaced the earlier protocols in more recently built or updated networks. TACACS+ uses the Transmission Control Protocol (TCP) and RADIUS uses the User Datagram Protocol (UDP). Some administrators recommend using TACACS+ because TCP is seen as a more reliable protocol. Whereas RADIUS combines authentication and authorization in a user profile, TACACS+ separates the two operations.

TACACS and XTACACS are still running on many older systems.

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More resources from around the web: - Robert Kiessling offers a TACACS Frequently-Asked Questions . - In 1997, Cisco declared that TACACS and XTACACS are End-of-Maintenance (that is, problems would no longer be fixed by Cisco because newer protocols had replaced them). - TACACS is described in RFC 1492 .

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