2V0-41.24 Question 82
Single answerAn administrator is troubleshooting a VMware NSX-T Data Center environment and notices excessive network traffic caused by Broadcast, Unknown unicast, and Multicast (BUM) traffic within a Logical Switch. How does NSX-T handle BUM traffic in an overlay environment to ensure network efficiency?
- A
It uses unicast replication to send BUM traffic to all Transport Nodes in the segment.
- B
It uses multicast groups at the physical network layer to distribute BUM traffic efficiently.
- C
It leverages Head-End Replication (HER) to replicate BUM traffic at the source Transport Node and send it to other nodes.
- D
It suppresses all BUM traffic at the source to prevent it from propagating across the network.
Show answer and explanation
Correct answer: C
Explanation
BUM traffic (Broadcast, Unknown unicast, and Multicast) is a key consideration in overlay networking. NSX-T manages BUM traffic using Head-End Replication (HER) in environments where multicast is not enabled on the physical network. In HER, the source Transport Node replicates BUM traffic and sends it to other Transport Nodes in the logical segment. This approach ensures that BUM traffic is delivered correctly without relying on physical network multicast, making it an efficient and scalable solution.
- A. Incorrect.
This is incorrect. NSX-T does not use unicast replication for BUM traffic because it is not efficient for large-scale environments.
- B. Incorrect.
This is incorrect. NSX-T does not rely on multicast at the physical network layer for BUM traffic in overlay environments. NSX-T is designed to operate independently of physical network multicast.
- C. Correct.
This is correct. NSX-T uses Head-End Replication (HER) where the originating Transport Node replicates BUM traffic and sends it to other nodes in the segment. This ensures efficient delivery of BUM traffic in the overlay.
- D. Incorrect.
This is incorrect. NSX-T does not suppress BUM traffic entirely, as it is necessary for some Layer 2 operations. Instead, it manages BUM traffic efficiently using methods like HER.