MAC explosion is best described as a large amount of MAC addresses being withdrawn and relearned?

Answer(s): A

What is the name of the feature supported on the Alcatel-Lucent 7750 SR that prevents MAC explosion in large VPLS deployments?

Answer(s): C

Why is MAC explosion a factor to be considered when designing a large VPLS network? (Choose 2)

The time to relearn thousands of MAC addresses may result in excessive flooding or loss of packets.
If the FDB reaches the limit, the router will discard frames.
Discarding frames when the FDB limit is reached could deny SLA guarantees.
It could take several seconds to relearn thousands of MAC addresses denying QoS/SLA guarantees.

Answer(s): A,D

When a PE node receives a PBB encapsulated frame on a B-VPLS, how does the PE determine which l-VPLS it belongs to?

The l-TAG in the l-SID is inspected to determine where the frame should be delivered.
When the B-MAC header is stripped the customer MAC address is then looked up in the FDB
The l-SID in the l-TAG is inspected to determine where the frame should be delivered.
The PE inspects the service label in the MPLS header before stripping the B-MAC header.

Answer(s): C

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