AAA stands for Authentication, Authorization and Accounting.
AAA network security services provide the primary framework through which you set up access control on your router or access server. Basically, who has access to the server and what services they are allowed to use once they have access.
For more information on AAA go here: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800ca7a7.html.
There are also numerous case studies on AAA implementation on Cisco.com, just do a search with the term "AAA".
Cheers,
Josef.
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