AAA stands for Authentication, Authorization and Accounting.+ Authentication: Specify who you are (usually via login username & password)+ Authorization: Specify what actions you can do, what resource you can access+ Accounting: Monitor what you do, how long you do it (can be used for billing and auditing)An example of AAA is shown below:+ Authentication: “I am a normal user. My username/password is user_tom/learnforever”+ Authorization: “user_tom can access LearnCCNA server via HTTP and FTP”+ Accounting: “user_tom accessed LearnCCNA server for 2 hours”. This user only uses “show” commands.
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