(Explain in detail Cisco authentication (a): AAA stands for authentication, authorization, and accounting, which means authentication, authorization, and accounting. Its main purpose is to manage which users can access the server, what services users with access rights can get, and how to account for users who are using network resources. 1. Authentication: verify that the user can gain access - "who are you?" 2. Authorization: what resources can authorized users use - "what can you do?" 3. Accounting: record users' use of network resources - "what did you do?")
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