Alcatel-Lucent NRS I – Interior Routing Protocols and High Availability — Question 9

Which of the following best describes how IS-IS routers exchange updates on an Ethernet interface?

Answer options

• A. IS-IS routers exchange updates by sending UDP packets to a multicast address.
• B. IS-IS routers exchange updates using IP multicast packets.
• C. IS-IS routers exchange updates using Ethernet multicast packets.
• D. IS-IS routers exchange updates by sending packets to the subnet broadcast address.

Correct answer: C

Explanation

The correct answer is C because IS-IS routers utilize Ethernet multicast packets to efficiently distribute updates on Ethernet interfaces. The other options are incorrect since IS-IS does not rely on UDP packets, IP multicast packets, or the subnet broadcast address for exchanging updates.