Alcatel-Lucent NRS I – Interior Routing Protocols and High Availability — Question 10

What acts as the tie breaker on an Alcatel-Lucent 7750 SR if the priorities are the same when IS-IS is electing a DIS?

Answer options

• A. The system ID
• B. The loopback address
• C. The sequence number of the hello packet
• D. The device that first initiated communication becomes the DIS

Correct answer: A

Explanation

The correct answer is A, as the system ID is used as the tie-breaker when multiple devices have the same priority during DIS election in IS-IS. Options B, C, and D do not serve this purpose in the context of the IS-IS protocol on an Alcatel-Lucent 7750 SR, making them incorrect.