What is TACACS? Radius?

Answer Posted / pranab bose

Terminal Access Controller Access-Control System (TACACS) is
a remote authentication protocol that is used to communicate
with an authentication server commonly used in UNIX
networks. TACACS allows a remote access server to
communicate with an authentication server in order to
determine if the user has access to the network.

But RADIUS is also remote authentication protocol which is
used in WINDOWS, and working between RAS (Remote access
server) and IAS (Internet Authentication Server).

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