Implementing Cisco Application Centric Infrastructure (DCACI) — Question 181

A bridge domain for an EPG called “Web Servers” must be created in the Cisco APIC. The configuration must meet these requirements:

• Only traffic to known MAC addresses must be allowed to reduce noise.
• The multicast traffic must be limited to the ports that are participating in multicast routing.
• The endpoints within the bridge domain must be kept in the endpoint table for 20 minutes without any updates.

Which set of steps configures the bridge domain that satisfies the requirements?

Answer options

• A. Switch L2 Unknown Unicast to Flood. Select the default Endpoint Retention Policy and set the Local Endpoint Aging to 20 minutes. Set Multicast Destination Flooding to Flood in Encapsulation.
• B. Set L2 Unknown Unicast to Hardware Proxy. Configure L3 Unknown Multicast Flooding to Optimized Flood. Create an Endpoint Retention Policy with a Local Endpoint Aging Interval of 1200 seconds.
• C. Multicast Destination Flooding should be set to Flood in BD. Set L3 Unknown Multicast Flooding to Flood. Select the default Endpoint Retention Policy with a Local Endpoint Aging Interval of 1200 seconds.
• D. Select the ARP Flooding checkbox. Create an Endpoint Retention Policy with a Remote Endpoint Aging Interval of 20 minutes. Set L3 Unknown Multicast Flooding to Optimized Flooding.

Correct answer: B

Explanation

Option B is correct because it configures the L2 Unknown Unicast to Hardware Proxy, which limits noise from unknown MAC addresses, and sets the Local Endpoint Aging to 20 minutes, maintaining endpoints in the table as required. The other options either do not meet the endpoint retention requirements or incorrectly configure multicast flooding settings.