AAA (Authentication, Authorisation and Accounting)

Hie.

Can someone please point me to resources where i can understand what AAA is. Is it a protocol? If so....what is tacacs and radius? How does protocols such as PPP fit into the picture? Kerberos etc. Im lost and dont understand what AAA is.
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yolunga2000Asked:
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rcflyrCommented:
AAA sort of a set of guidelines rather than a specific protocol.  You can read the RFCs listed here for specific information (good bed time reading)
http://en.wikipedia.org/wiki/AAA_protocol

RADIUS and TACACS use the concepts in the AAA RFCs to accomplish the task.
http://en.wikipedia.org/wiki/RADIUS
http://en.wikipedia.org/wiki/TACACS

You might also want to read (RADIUS Replacement):
http://en.wikipedia.org/wiki/Diameter_(protocol)
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