Authentication, Authorization, and Accounting (AAA)

Authentication, authorization, and accounting, (pronounced triple A) provides security to Cisco IOS routers and network devices beyond the simple user authentication available on IOS devices.

AAA provides a method to identify which users are logged into a router and each user's authority level. AAA also provides the capability to monitor user activity and provide accounting information.

In today's IP networks, access to network data is available in a variety of methods, including the following:

  • PSTN Dialup modems

  • ISDN dialup

  • Access through the Internet through virtual private networks (VPNs)

The AAA model is defined as follows:

  • Authentication— Who are you?

  • Authorization— What resources are you ...

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