Protocols Used Between the ACS and the Router
The next couple of sections discuss how to configure the router to forward authentication questions to the ACS server and examine how to tell the ACS server to work with the router. But right now, you need to understand the “language of love” used to communicate between the ACS server and the router (with a router acting as a client to the ACS server).
Two main protocols may be used between the ACS server and its client (such as a router that is using the ACS server to verify authentication requests): TACACS+ (pronounced TACK-AXE, you do not need to say the +) and RADIUS (pronounced RAY-D-US).
TACACS+ stands for Terminal Access Control Access Control Server, and that is why we just use the acronym. ...
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