Cisco Secure Access Control Server (ACS) is a network security software application that provides a number of security features such as logging, debugging, authorization, and authentication of users.
Cisco ACS supports both RADIUS and TACACS+. You can download a trial version of the software that is supported on a Windows-based platform at http://cisco.com/public/sw-center/. Click the link to "Cisco Secure Software."
Although the CCIE Security written exam does not heavily test this application, it is tested in the lab portion, so you are highly encouraged to study Chapter 8, which has a detailed Cisco Secure ACS example and discusses how features such as user-based access are enabled.
If you want more details on Cisco Secure ACS, go to http://www.cisco.com/univercd/cc/td/doc/ product/access/acs_soft/csacs4nt/acs33/user/o.htm.
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