Free 4A0-105 Exam braindumps download (4A0-105 exam dumps Free)

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

If the max remote-age timer of a B-VPLS is reached, what happens to the remotely learned MAC addresses in the l-VPLS service?

There is no effect. The MAC addresses for the l-VPLS age out independently of the aging of B-VPLS addresses.
The MAC addresses for the l-VPLS will age out immediately following the remote-age out of the backbone-macs of the B-VPLS.
By default, the remote-age timer of the B-VPLS is configured to 0 and addresses do not age out. The l-VPLS uses its own timer.
The same timer is used for B-VPLS and l-VPLS addresses on the node.

Answer(s): B

What is the default remote-age timer of a B-VPLS?

Answer(s): C

Which of the following describes the scope of the IEEE 802.3ah EFM standard? (Choose 3)

Monitor and troubleshoot a point-to-point full-duplex link.
Monitor and troubleshoot end-to-end services.
Can be used at the core to trigger MPLS protection mechanisms when a physical failure detection is not possible.
Should not be used at the core to trigger MPLS protection. BFD is the only method that can be used when physical failure detection is not possible.
Valuable in the last-mile connection to the Service Provider demarcation device.

Answer(s): A,C,E

Free 4A0-105 Exam Braindumps 4A0-105 Virtual Private LAN Services Questions 51–55 (page: 12)