JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing — Question 44

By default, which two tasks does an Ethernet bridge perform in response to receiving a multicast frame? (Choose two.)

Answer options

• A. It learns the MAC address of any responding nodes and updates its bridge table with the source MAC address and ingress port
• 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 answer is A and C because an Ethernet bridge learns MAC addresses and updates its bridge table, while it also floods multicast frames out of all interfaces except the incoming one. Option B is incorrect because the bridge does not drop multicast frames by default, and option D is not correct as the bridge typically floods multicast frames rather than selectively forwarding them.