Which of the following protocol was used by the INITIAL version of the Terminal Access Controller Access Control System TACACS for communication between clients and servers?
Correct Answer: C
Explanation/Reference:
Explanation:
TACACS has been through three generations: TACACS, Extended TACACS (XTACACS), and TACACS+.
TACACS combines its authentication and authorization processes; XTACACS separates authentication, authorization, and auditing processes; and TACACS+ is XTACACS with extended two-factor user authentication. TACACS uses fixed passwords for authentication, while TACACS+ allows users to employ dynamic (one-time) passwords, which provides more protection.
The original TACACS was developed during the days of ARPANET which is the basis for the Internet.
TACACS uses UDP as its communication protocol. TACACS+ uses TCP as its communication protocol.
Incorrect Answers:
A: TACACS uses UDP as its communication protocol, not TCP.
B: TACACS uses UDP as its communication protocol, not SSL.
D: TACACS uses UDP as its communication protocol, not SSH.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 234 Jacobs, Josh, et al., SSCP Systems Security Certified Practitioner Study Guide and DVD Training System, Syngress, Rockland, 2003, p. 450
http://en.wikipedia.org/wiki/TACACS