Alcatel-Lucent NRS I – Interior Routing Protocols and High Availability — Question 4

When IS-IS is electing a DIS, what is used as the tie breaker on an Alcatel-Lucent 7750 SR, if the priorities are the same?

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
• E. The highest interface MAC address

Correct answer: E

Explanation

The highest interface MAC address is utilized as the tie breaker when there is a priority match during DIS election in IS-IS. The other options, such as system ID and loopback address, do not serve this purpose in the context of the Alcatel-Lucent 7750 SR, making them incorrect for this specific scenario.