This document provides an overview of authentication, authorization, and accounting (AAA) and describes how to configure AAA using local and server-based methods. It covers the purpose and components of AAA, including authentication, authorization, and accounting. It also describes how to configure local AAA authentication using the command line interface or Security Device Manager and how to troubleshoot local AAA. Finally, it introduces server-based AAA, comparing it to local AAA, and provides an overview of the TACACS+ and RADIUS protocols used for server-based AAA communication.