What is AAA server where it be used

         AAA server basically used for NOC, central NOC and internet exchange..

     An AAA server is a server program that handles user requests for access to computer resources and, for an enterprise, provides authentication, authorization, and accounting (AAA)services. The AAA server typically interacts with network access andgateway servers and with databases and directories containing user information. The current standard by which devices or applications communicate with an AAA server is theRemote Authentication Dial-In User Service (RADIUS).