Implementing Cisco Application Centric Infrastructure (DCACI) — Question 211

A Cisco ACI fabric must send a packet between two pods in a Cisco ACI Multi-Pod topology where ARP flooding is disabled within the bridge domain. How does a Cisco ACI spine switch forward ARP messages from a leaf switch in POD1 to POD2?

Answer options

• A. ARP optimization is applied and sends ARP to remote anycast.
• B. The ARP message is dropped and connectivity is lost between the endpoints.
• C. A proxy ARP message is sent to destination group 225.224.0.0.
• D. An ARP Glean message is sent to multicast address 239.255.255.240.

Correct answer: D

Explanation

The correct answer is D because in a Cisco ACI environment with ARP flooding disabled, ARP Glean messages are used to communicate ARP requests across pods. Other options are incorrect as A suggests ARP optimization, which is not the method used, B implies connectivity loss which is not the case with ARP Glean, and C describes proxy ARP, which is not the method applied in this scenario.