Implementing Cisco Application Centric Infrastructure (DCACI) — Question 5

An engineer configured a bridge domain with the hardware-proxy option for Layer 2 unknown unicast traffic. Which statement is true about this configuration?

Answer options

• A. The leaf switch drops the Layer 2 unknown unicast packet if it is unable to find the MAC address in the local forwarding tables.
• B. The Layer 2 unknown hardware proxy lacks support of the topology change notification.
• C. The leaf switch forwards the Layers 2 unknown unicast packets to all other leaf switches if it is unable to find the MAC address in its local forwarding tables.
• D. The spine switch drops the Layer 2 unknown unicast packet if it is unable to find the MAC address in the proxy database.

Correct answer: D

Explanation

The correct answer is D because the spine switch is responsible for managing the proxy database and will drop packets if it cannot find the relevant MAC address. Option A is incorrect as the leaf switch does not drop packets under these conditions; instead, it relies on the spine switch. Option B is incorrect because the hardware proxy does support topology change notifications, and Option C is wrong as the leaf switch does not forward unknown unicast packets to other leaf switches in this scenario.