JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing — Question 33

An Ethernet bridge is configured such that all interfaces are in a single broadcast domain, by default. Which two tasks does the bridge perform in response to receiving a multicast frame?
(Choose two)

Answer options

• A. It learns the source MAC address
• B. It drops the frame
• C. It floods the frame out of all interfaces except the one on which it was received
• D. It floods the frame out of particular interfaces based on its multicast MAC table

Correct answer: A, C

Explanation

The correct actions are A and C. The bridge learns the source MAC address to update its MAC address table and floods the multicast frame out of all interfaces except the one it was received on because multicast frames are intended for multiple destinations. Options B and D are incorrect; the bridge does not drop the frame and does not selectively forward based on a multicast MAC table.