Free Cisco 300-620 Actual Exam Questions - Question 7 Discussion

B, because disabling IP Data-plane Learning prevents conflicts with external gateway MAC learning.

It’s D for me. When the default gateway lives outside the fabric, you don’t want the ACI fabric advertising host routes that could confuse or conflict with that external routing. Disabling Advertise Host Routes keeps those internal routes from leaking out, which fits the scenario better than messing with MAC learning limits. A might help with learning external MACs, but D directly addresses the routing aspect for an external gateway, which seems more critical here.

It’s A because the fabric needs to learn the external gateway’s MAC address even though it’s outside the subnet, so disabling Limit IP Learning to Subnet allows that. B would block some learning that’s actually necessary here.

D imo, disabling Advertise Host Routes stops the fabric from advertising routes for hosts, so it won’t interfere with the external gateway routing outside the fabric. This seems key when the gateway isn’t inside the ACI.

This one tripped me up at first, but I’d pick A. Disabling Limit IP Learning to Subnet lets the fabric learn MAC addresses outside the usual subnet boundaries, which fits having a gateway outside the fabric. B seems more about stopping the fabric from learning any IP data-plane info, which could be too restrictive here. So A feels like it directly supports learning that external gateway’s MAC properly without blocking necessary traffic.

B vs A? I’d go with B here since disabling IP Data-plane Learning lets the fabric accept external MACs, which makes sense if the gateway is outside the fabric. If you keep IP learning limited, it might block the external gateway’s MAC from being learned properly. So turning off data-plane learning seems like a solid way to handle that scenario.

It’s A. You gotta disable Limit IP Learning to Subnet so the gateway outside the fabric can be reached properly. Seems pretty straightforward to me.