Implementing Cisco Application Centric Infrastructure (DCACI) — Question 76

A bridge domain for a new endpoint group in the Cisco ACI fabric must meet these requirements:
• The bridge domain must function as the default gateway for the subnet so that routing remains within the Cisco ACI fabric.
• ARP requests must be managed via Layer 3 unicast packets or be dropped to reduce excessive broadcast traffic.
• The impact of misconfigured virtual machines must be kept to a minimum by preventing IP addresses outside of the configured subnet from being routed.

Which set of actions must be taken?

Answer options

• A. Disable ARP Flooding. Enable Limit IP Learning to Subnet. Enable Unicast Routing on the bridge domain and configure a subnet.
• B. Enable Limit IP Learning to Subnet. Enable Unicast Routing on the bridge domain and configure a subnet. Set Multi-Destination Flooding to Flood in BD.
• C. Set Endpoint Retention Policy to default. Enable ARP Flooding. Enable Unicast Routing on the bridge domain and configure a subnet.
• D. Enable Unicast Routing on the bridge domain and configure a subnet. Set L2 Unknown Unicast to Flood. Disable Endpoint Retention Policy.

Correct answer: A

Explanation

The correct answer, A, includes disabling ARP Flooding to manage ARP requests efficiently, enabling Limit IP Learning to Subnet to restrict IP learning to the specified subnet, and enabling Unicast Routing to ensure proper routing within the fabric. Options B and C fail to prevent excessive broadcasts and do not sufficiently manage ARP requests, while D introduces unnecessary flooding and removes endpoint retention, which could lead to misconfigurations being propagated.