TACACS is known as Terminal Access Controller Access Control System, is a remote protocol used to link with a server in networks.
It permits a remote access server to connect with an authentication server to determine if the user has access to the system.
The Defense Data Network developed it for MILNET in the 1980s. It defines in RFC 1492 from 1993 and uses port 49 ( UDP, or TCP ).
A later version of TACACS is XTACACS. Both versions replaced by TACACsPlus (TACACS +, 1995).
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