AAA

AAA is short for Authentication Authorization and Accounting. AAA is a framework that is used to contro0l and track access within a network. Cisco IOS devices use AAA extensively for this purpose.

Common network protocols that deliver such functionality include TACACS+ and RADIUS.

Links:

https://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli_rel_4_1/Cisco_Nexus_5000_Series_Switch_CLI_Software_Configuration_Guide_chapter17.html