TACACS
TACACS is now somewhat dated and is not used as frequently as it once was. A later version of TACACS was called XTACACS (Extended). These two versions have generally been replaced by TACACS+ and RADIUS in newer or updated networks. TACACS+ is a completely new protocol and is therefore not compatible with TACACS or XTACACS.
TACACS is detailed in RFC 1492.
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