Free Cisco 300-620 Actual Exam Questions - Question 8 Discussion
Layer 3 gateway and other end hosts. Which ACI bridge domain configuration should be used?
It’s B because flooding unknown unicast and keeping ARP flooding enabled ensures all external hosts and the gateway get proper reachability without relying on hardware proxy support. This is safer for external networks.
Maybe C, since disabling ARP flooding could reduce unnecessary broadcast traffic.
A helps with efficient ARP handling for external Layer 3 gateways, better than B.
C/D? I’m thinking the ARP flooding might need to be enabled since it’s connecting to an external Layer 3 gateway, but sometimes disabling ARP flooding helps reduce unnecessary traffic. The hardware proxy for L2 unknown unicast makes sense to optimize forwarding. Just not sure if ARP flooding should be on or off here for the external network scenario. Anyone else remember if it’s better to keep ARP flooding enabled when you have an external L3 gateway involved?