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Terminal access controller access control system (TACACS) is an authentication protocol used for remote communication with any server housed in a UNIX network. TACACS provides an easy method of determining user network access via remote authentication server communication. The TACACS protocol uses port 49 by default.
TACACS uses allow/deny mechanisms with authentication keys that correspond with usernames and passwords. Cisco, which designed and launched the TACACS protocol, is also its owner.
The TACACS protocol, which has a very simple working mechanism, accepts a user query from a remote server and forwards this query for necessary action to the authentication server. The authentication server may allow or deny a user query on the host’s behalf. The host is a system or platform that runs on the server. The query result is sent to the query initiator as a feedback response.
The routing node used in dialup connections during the user login process allows or denies user access based on the query’s response.