Why Use Cisco ACS?
Most midsize and large companies using Cisco equipment are also going to use ACS servers so that they can centrally manage the users and control what those users are authorized to do. By configuring users locally on the ACS server, and then having the dozens or hundreds of routers and switches act as clients to the ACS server, you can use the Cisco ACS server as a central clearinghouse for the authentication of users. This way, you can create a user account one time on the ACS server, and configure the routers and switches to use the ACS server for any type of user, whether an administrator trying to access the router for configuration or an end user who just needs access through a router for some network application or service ...
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