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Cisco Certified Network Associate (CCNA) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
B is correct.
RADIUS uses UDP while TACACS+ uses TCP. RADIUS encrypts only the password in the access-request packet, from the client to the server. The remainder of the packet is unencrypted. Other information, such as username, authorized services, and accounting, can be captured by a third party. TACACS+ encrypts the entire body of the packet but leaves a standard TACACS+ header. RADIUS combines authentication and authorization. TACACS+ uses the AAA architecture, which separates AAA.
the correct answer is option B: TACACS+ separates authentication and authorization, while RADIUS combines them. Option A is incorrect because neither RADIUS nor TACACS+ is designed to log commands entered by administrators. Option C is incorrect because both RADIUS and TACACS+ can encrypt sensitive information. Option D is incorrect because both RADIUS and TACACS+ can be used for various types of authentication, including dial-up, wireless, and VPN.