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Terminal Access Controller Access-Control System Plus
Application Layer — Authentication
Protocol Overview
Full Name
Terminal Access Controller Access-Control System Plus
Abbreviation
TACACS+
OSI Layer
Application Layer
Category
Authentication
Default Port
49
RFC
RFC 8907
About TACACS+
Cisco-developed AAA protocol that separates authentication, authorization, and accounting into independent transactions. Encrypts the entire payload, unlike RADIUS which only encrypts passwords.
Application Layer
Authentication
Port 49
Standards Reference
TACACS+ is defined in RFC 8907, published by the Internet Engineering Task Force (IETF). RFCs are the official standards documents for internet protocols and are freely available for public review.