Terms you'll need to understand
CiscoSecure Access Control Server (ACS)
Authentication, authorization, and accounting (AAA)
Terminal Access Controller Access Control System (TACACS)
Remote Authentication Dial-In User Service (RADIUS)
Packet mode
Character mode
Techniques you'll need to master:
Starting the AAA process on a router
Configuring AAA addresses and passwords
Enabling authentication
Enabling authorization
Enabling accounting
Understanding the AAA commands