Terminal Access Controller Access Control System Plus (TACACS+)

Terminal Access Controller Access Control System Plus (TACACS+)

Terminal Access Controller Access Control System Plus (TACACS+) a Cisco security protocol that is commonly used in UNIX networks.

TACACS+ provides separate authentication, authorization, and accounting services, which RADIUS does not support. TACACS, the predecessor, was originally developed in 1984 by BBN, who did the job on contract for the U.S.

Department of Defense’s MILNET. Authentication, authorization, and accounting (AAA) is represented to the user in a multi-stage process using Transmission Control Protocol (TCP).