Home » Cisco » 210-260 v.2 » Which three ways does the TACACS protocol differ from RADIUS?
In which three ways does the TACACS protocol differ from RADIUS? (Choose three.)
A. TACACS uses TCP to communicate with the NAS.
B. TACACS can encrypt the entire packet that is sent to the NAS.
C. TACACS supports per-command authorization.
D. TACACS authenticates and authorizes simultaneously, causing fewer packets to be transmitted.
E. TACACS uses UDP to communicate with the NAS.
F. TACACS encrypts only the password field in an authentication packet.
Correct Answer: ABC
Explanation/Reference:
TACACS+ uses Transmission Control Protocol (TCP) port 49 to communicate between the TACACS+ client and the TACACS+ server. An example is a Cisco switch authenticating and authorizing administrative access to the switch’s IOS
CLI. The switch is the TACACS+ client, and Cisco Secure ACS is the server.
TACACS+ communication between the client and server uses different message types depending on the function. In other words, different messages may be used for authentication than are used for authorization and accounting. Another very interesting point to know is that TACACS+ communication will encrypt the entire packet. Reference: http://www.networkworld.com/article/2838882/radius-versus-tacacs.html
