The correct answers are It separates authorization and authentication functions and It uses TCP port 49.
TACACS+ (Terminal Access Controller Access Control System Plus) is a network security protocol that provides centralized authentication, authorization, and accounting (AAA) services for network devices.
TACACS+ separates authentication and authorization functions, which means that the authentication server is responsible for verifying the user's identity, and the authorization server is responsible for determining what the user is allowed to do.
TACACS+ uses TCP port 49 for communication between the client and server.
Extended TACACS (XTACACS) extends the TACACS protocol with additional functionality. It also separates the authentication, authorization, and accounting (AAA) functions out into separate processes, allowing them to be handled by separate servers and technologies.
TACACS is defined in RFC 8907 (older RFC 1492), and uses (either TCP or UDP) port 49 by default.
https://en.wikipedia.org/wiki/TACACS
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