Implementing Cisco Application Centric Infrastructure (DCACI) — Question 21

An engineer is extending EPG connectivity to an external network. The external network houses the Layer 3 gateway and other end hosts. Which ACI bridge domain configuration should be used?

Answer options

• A. Forwarding: Custom L2 Unknown Unicast: Hardware Proxy L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Enabled
• B. Forwarding: Custom L2 Unknown Unicast: Flood L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Enabled
• C. Forwarding: Custom L2 Unknown Unicast: Hardware Proxy L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Disabled
• D. Forwarding: Custom L2 Unknown Unicast: Flood L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Disabled

Correct answer: B

Explanation

The correct answer is B, as it allows for the necessary flooding of Layer 3 unknown multicast traffic, which is crucial for communication with external networks. Options A and C incorrectly configure the L3 unknown multicast flooding as either hardware proxy or disabled, which would hinder connectivity. Option D also disables ARP flooding, which is essential for the resolution of IP addresses within the bridge domain.