CompTIA Security+ Question C-21

Which of the following authentication services should be replaced with a more secure alternative?

A. RADIUS
B. TACACS
C. TACACS+
D. XTACACS

Answer: B

Explanation:
Terminal Access Controller Access-Control System (TACACS) is less secure than XTACACS, which is a proprietary extension of TACACS, and less secure than TACACS+, which replaced TACACS and XTACACS.