Nokia Nokia Certifications 4A0-105 Questions & Answers

• Question 101:

  Which PDU type is sent periodically over a link in the IEEE 802.3ah EFM as a method of keepalive?

  A. Event notification.

  B. Loopback control.

  C. Information.

  D. Variable request.

  E. Variable response.

  Correct Answer: C

• Question 102:

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

  A. Monitor and troubleshoot a point-to-point full-duplex link.

  B. Monitor and troubleshoot end-to-end services.

  C. Can be used at the core to trigger MPLS protection mechanisms when a physical failure detection is not possible.

  D. 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.

  E. Valuable in the last-mile connection to the Service Provider demarcation device.

  Correct Answer: ACE

• Question 103:

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

  A. The same timer is used in all VPLS types.

  B. Higher than the default timer of an I-VPLS.

  C. Lower than the default timer of an l-VPLS.

  D. The same timer as an l-VPLS.

  Correct Answer: C

• Question 104:

  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?

  A. There is no effect. The MAC addresses for the l-VPLS age out independently of the aging of B-VPLS addresses.

  B. The MAC addresses for the l-VPLS will age out immediately following the remote-age out of the backbone-macs of the B-VPLS.

  C. 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.

  D. The same timer is used for B-VPLS and l-VPLS addresses on the node.

  Correct Answer: B

• Question 105:

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

  A. The l-TAG in the l-SID is inspected to determine where the frame should be delivered.

  B. When the B-MAC header is stripped the customer MAC address is then looked up in the FDB

  C. The l-SID in the l-TAG is inspected to determine where the frame should be delivered.

  D. The PE inspects the service label in the MPLS header before stripping the B-MAC header.

  Correct Answer: C

• Question 106:

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

  A. The time to relearn thousands of MAC addresses may result in excessive flooding or loss of packets.

  B. If the FDB reaches the limit, the router will discard frames.

  C. Discarding frames when the FDB limit is reached could deny SLA guarantees.

  D. It could take several seconds to relearn thousands of MAC addresses denying QoS/SLA guarantees.

  Correct Answer: AD

• Question 107:

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

  A. H-VPLS

  B. M-VPLS

  C. PBB

  D. MC-EP

  Correct Answer: C

• Question 108:

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

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 109:

  Click on the exhibit below.

  

  Study the diagram shown. What consideration should be given to the transport tunnel of SDP 300?

  A. The SDP must be configured to use GRE encapsulation.

  B. The SDP must follow the same path as the user's SDP.

  C. The SDP should be configured to use an RSVP signaled transport with fast reroute.

  D. The SDP must be the same as the user's SDP.

  Correct Answer: C

• Question 110:

  What are the benefits of a hierarchical VPLS architecture? (Choose 3)

  A. Increases scalability

  B. Reduces the FDB size within a VPLS instance

  C. Reduces replication and bandwidth utilization from the MDU device to the core network

  D. Easier to manage

  E. Reduces the routing table size

  Correct Answer: ACD