4A0-105 Exam Training Practice Tests (Alcatel-Lucent Virtual Private LAN Services)]

Question 1

How is MAC learning achieved in traditional Ethernet switches?

A. As frames leave the switch, the DA is populated into the FDB. B. As frames leave the switch, the SA is populated into the FDB. C. As frames enter the switch, the DA is populated into the FD D. As frames enter the switch, the SA is populated into the FDB.

Correct Answer: D

Question 2

What is the default service-mtu for a VPLS service?

A. 1500 B. 1514 C. It depends on the network port MTU. D. 1518 E. It depends on the access port MTU.

Correct Answer: B

Question 3

Consider a large metro-to-metro VPLS network interconnected with a mesh of mesh-SDPs. Which of the following statements does NOT apply to this situation?

A. Bandwidth and replication inefficiency can occur on inter-metro links if there is a lot of multicast traffic B. Spanning-tree is required to prevent loops when using mesh SDPs on the inter-metro links. C. Network touches increase with each node added to the mesh. D. The number of control sessions grows exponentially in a fully meshed network.

Correct Answer: B

Question 4

What needs to be configured in a VPLS in order to forward customer STP BPDUs transparently?

A. Spanning tree must be enabled within the VPLS. B. Spanning tree BPDUs must be untagged. C. Spanning tree BPDUs must be tagged. D. Spanning tree must be disabled within the VPLS.

Correct Answer: D

Question 5

Click on the exhibit below.

Study the network diagram. Which of the following configurations is correct for user VPLS 100 on PE4?

A. Option E B. Option B C. Option B D. Option A E. Option C

Correct Answer: B

Question 6

Which of the following statements about the VC-ID is false?

A. There is a vc-id to vc-label mapping. B. The vc-id has point to point significance. C. The vc-id is part of the data plane encapsulation. D. The vc-id is signaled in the control plane.

Correct Answer: C

Question 7

How many designated ports are there in a spanning tree topology?

A. The same as the number of root ports B. The same as the number ofalternate ports in the topology C. 1 per switch D. 1 per segment

Correct Answer: D

Question 8

Click on the exhibit below.

Assume PE-1 has a mesh-sdp configured to every PE node in both Metro networks. What could be done to prevent the bandwidth replication between Metro 1 and Metro 2?

A. PE-1 must be configured with mesh-SDPs to every node receiving the multicast traffic. There is no way to reduce the replication or bandwidth. B. PE-1 can be configured with spoke-SDPs to every PE node in both Metro networks. This will reduce the bandwidth and replication within the network. C. PE nodes in Metro 1 could be configured with mesh-SDPs. PE nodes in Metro 2 would be configured with mesh-SDPs. However, the connection between Metro networks (PE-2 to PE-6) can be configured with a spoke-sdp. This would reduce the replication and bandwidth used on the link between Metro networks. This also reduces the replication required by PE-1. D. PE nodes in Metro 1 could be configured with spoke-SDPs. PE nodes in Metro 2 would be configured with spoke-SDPs. However, the connection between Metro networks (PE-2 to PE-6) can be configured with a mesh-sdp. This would reduce the replication and bandwidth used on the link between Metro networks. This also reduces the replication required by PE-1.

Correct Answer: C

Question 9

Click on the exhibit below.

Based on the following output what will the vc-id be of any mesh-sdp bound to this service?

A. 1514 B. 1000 C. 9000 D. 100

Correct Answer: B

Question 10

Click on the exhibit below.

Based on the output below which of the following statements is true?

A. This Bridge is the Root Bridge. B. This Bridge is furthest from the Root Bridge within the VPLS mesh. C. This Bridge is closest to the Root Bridge within the VPLS mesh. D. SAP 1/1/1 is an Edge Port.

Correct Answer: C

Question 11

What action will be taken when an Ethernet switch receives a frame with a known DA and an outer Ethertype value of 0x0800 on a dot1q encapsulated port?

A. The frame will be forwarded outthe port associated with the D B. The frame will be flooded to all ports. C. The frame will be fragmented and forwarded outthe port associated with the DA. D. The frame will be discarded.

Correct Answer: D

Question 12

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

A. Variable request. B. Variable response. C. Loopback control. D. Information. E. Event notification.

Correct Answer: D

Question 13

Click on the exhibit below.

In the diagram below, SAP 1 is put into the blocking state as a result of the spanning tree protocol. What will occur in the VPLS instance if SAP 2 goes down and SAP 1 transitions to the forwarding state? Select the most accurate statement.

A. Stale information will be used within the VPLS instance to forward traffic until the FDB ages out. B. An LDP control message will be sent to all devices in the mesh participating in the VPLS instance. The entire FDB in the VPLS instance will be flushed. C. An LDP control message will be sent to all devices in the mesh participating in the VPLS instance. Only MAC addresses associated with the PE that the failure occurred on will be flushed. D. A Spanning Tree BPDU will be sent across the mesh flushing the FDB table in all devices participating in the VPLS instance.

Correct Answer: B

Question 14

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

A. M-VPLS B. MC-EP C. H-VPLS D. PBB

Correct Answer: D

Alcatel-Lucent Virtual Private LAN Services - 4A0-105 Exam Practice Test