4A0-110 Exam Dumps | L1 ISIS adjacency is up between two routers (Node-1 and Node-2) with MD5 authentication configured. During

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Question 2/15

L1 ISIS adjacency is up between two routers (Node-1 and Node-2) with MD5 authentication configured.
During a maintenance window, an operator was planning to change one of the ISIS hello authentication
key from admin to admin123. After removing the hello authentication key from Node-1 (no change on
Node-2 side), the ISIS adjacency stayed up. The operator decided to fall back to the original configuration
and called Alcatel for support. Which of the following statement best describe the cause of the problem?
Select one answer only.

A. The ISIS hello authentication key was not configured properly in the first place, that's why removing the
authentication key does not impact the adjacency

B. The system interface is missing from the ISIS configuration, therefore ISIS is not working properly even
before the change

C. ISIS hello authentication key is not used to bring up ISIS adjacency when traffic-engineering is enabled
on the routers

D. ISIS hello authentication key is only used for hello packet exchange. It does not affect ISIS adjacency

E. The ISIS authentication key is the same as the hello authentication key, therefore removing hello
authentication key does not impact the adjacency

Question 2/15

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