Compare TACACS + and RADIUS - Cisco "... Compare TACACS+ and RADIUS These sections compare several features of TACACS+ and RADIUS. UDP and TCP RADIUS uses UDP while TACACS+ uses TCP. ... Packet Encryption RADIUS encrypts only the password in the access-request packet, from the client to the server...TACACS+ encrypts the entire body of the packet but leaves a standard TACACS+ header. ... Authentication and Authorization RADIUS combines authentication and authorization...TACACS+ uses the AAA architecture, which separates AAA. This allows separate authentication solutions that can still use TACACS+ for authorization and accounting. ..."

Answer 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.

given answers are correct

Provided answer is correct :)

TACACS+ (the T is for TCP) lots over overhead, Thoroughly Covers Packet radiUses UDP <-- no mnemonics for this one yet. Somebody come up with one, preferably using P to represent Password.