Chapter 4. AAA Configurations
You should familiarize yourself with a few different configurations that involve user authentication of traffic through the security appliance but also administrative access to the security appliance. These configurations are accomplished using authentication, authorization, and accounting (AAA).
The basics of AAA are simple. The first step in AAA is authentication. When you authenticate users, you are just verifying that they are who they say they are. After a user has been authenticated, you then can optionally authorize what that user does. As this is happening, you might also want to track these happenings. This is the accounting process. The following sections detail each.