Q9. What is the command syntax for specifying an AAA authentication for use on serial interface running PPP and using TACACS+ for user authentication? If the action returns an error, the user should be allowed access without an authentication.
A. aaa authentication enable default tacacs+ none
B. aaa authentication ppp default tacacs+
C. aaa authentication login default tacacs+ none
D. aaa authentication ppp default tacacs+ none
Correct Answer: D
Explanation:
The correct syntax for AAA authentication for use on serial interfaces running PPP (Point to Point Protocol) is:
R(config)# aaa authentication ppp {default | <list-name> <method1> [method2] [method3]..}
For example, to use tacacs+ first and then no authentication (if error is returned in first case), use the command:
R(config)# aaa authentication ppp default tacacs+ none
Alternately, we can use the list-name, say mylist as below:
R(config)# aaa authentication ppp mylist tacacs+ none
List-name is useful when you need to configure the line authentication by calling the list-name.
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