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4A0-105 Nokia Virtual Private LAN Services Question and Answers

Question # 4

MAC explosion is best described as a large amount of MAC addresses being withdrawn and relearned?

A.

TRUE

B.

FALSE

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Question # 5

What is the default fdb size for a VPLS service?

A.

100

B.

1

C.

25

D.

250

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Question # 6

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

A.

The vc-id is signaled in the control plane.

B.

The vc-id is part of the data plane encapsulation.

C.

There is a vc-id to vc-label mapping.

D.

The vc-id has point to point significance.

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Question # 7

Why are provisioning requirements a factor that influence VPLS design? (Choose 2)

A.

Adding or removing a node may require several network touches.

B.

Adding or removing a SAP may require several network touches.

C.

Adding or removing a service may require several network touches.

D.

Adding or removing an Epipe may require several network touches.

E.

Provisioning is a factor for all Ethernet services.

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Question # 8

IEEE 802.3ah is similar to SONET/SDH in that it can count and report bit errors and frame errors.

A.

TRUE

B.

FALSE

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Question # 9

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.

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Question # 10

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 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.

C.

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.

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.

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Question # 11

How is it possible for multiple services to be carried over the same MPLS LSPs?

A.

Multiple SDPs must be configured and bound to the LSPs for this to be possible.

B.

It is not possible to carry multiple services over the same MPLS LSPs.

C.

A vc-label is signaled per service.

D.

The vc-id is part of the data plane and maps the traffic to the appropriate service.

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Question # 12

In RSTP, which state do all ports initialize in?

A.

Designated

B.

Discarding

C.

Listening

D.

Root

E.

Forwarding

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Question # 13

What is the MTU impact on the SDP path-mtu if fast reroute facilities-mode is implemented on the LSP?

A.

There will be no impact on the path-mtu.

B.

The path-mtu will decrease by4 bytes.

C.

The path-mtu will increase by 4 bytes.

D.

The path-mtu will decrease by 8 bytes.

E.

The path-mtu will increase by 8 bytes.

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Question # 14

Click on the exhibit below.

Assuming there is a full mesh of mesh-SDPs between the PEs within each metro network and a spoke-SDP between PE-C of Metro A and PE-B of Metro B. how is traffic forwarded from PE-A in Metro A to PE-D of Metro B? Select the most accurate statement.

A.

An LSP must be configured between PE-A and PE-D for this traffic to be forwarded.

B.

A VPLS FDB lookup is done at PE-A of Metro A only

C.

An SDP must be configured between PE-A of Metro A and PE-D of Metro D for this traffic to be forwarded

D.

A VPLS FDB lookup is done at PE-A and PE-C of Metro A and PE-B of Metro B

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Question # 15

Five VPLS services have been configured between two PE routers. What is the minimum amount of SDPs that must be configured?

A.

5-one for each service.

B.

2-one in each direction.

C.

10-five in each direction.

D.

None of the above.

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Question # 16

RSTP blocks a spoke-sdp using a management VPLS. Is traffic affected on an ES using the same transport SDP?

A.

Yes

B.

No

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Question # 17

Which of the following SAP encapsulations supports only one service on a port?

A.

Dot1Q

B.

Null

C.

Q-in-Q

D.

Ipcp

E.

BCP

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Question # 18

Which of the following best describes the difference between VPWS and VPLS?

A.

Unlike VPLS. VPWS appears as a multi-hop network to the customers.

B.

Unlike VPLS, VPWS allows CEs that are member of the same service instance to communicate with each other as if they are connected via a bridged LAN.

C.

Unlike VPWS, VPLS allows customers to view the network as a routed network.

D.

Unlike VPWS, VPLS is a service where customer MAC addresses are learned.

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Question # 19

An l-VPLS can be associated with many B-VPLS services.

A.

TRUE

B.

FALSE

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Question # 20

Click on the exhibit below.

Assume PE-B expects avian tag as part of the RFC 4762 (Martini) encapsulation. How must PE-A be configured?

A.

The port that the SAP belongs to must have the correct ether type configured.

B.

The SAP must be configured with the right VLAN tag.

C.

The SDP VC type must be configured as type VLAN and the correct vlan-vc-tag must be specified.

D.

All of the above.

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Question # 21

Which of the following statements about a management VPLS are true? (Choose 2)

A.

A management VPLS carries customer traffic over the non-blocking spoke-SDP

B.

A VPLS service must be defined as a management VPLS upon creation to take on the role of a management VPLS

C.

The state of a spoke-SDP within a user VPLS will take on the state of the spoke-sdp within the management VPLS.

D.

The management VPLS must be created before the user VPLS.

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Question # 22

Which of the following is a true statement?

A.

The lower the age-time, the greater the amount of flooding

B.

The higher the age-time, the greater the amount of flooding.

C.

The lower the age-time, the lower the amount of flooding.

D.

There is no relationship between the age-time and the amount of flooding.

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Question # 23

In RSTP, how is the root bridge selected?

A.

The switch with the highest bridge-id is selected as root.

B.

The switch with the lowest bridge-id is selected as root.

C.

The switch with the highest MAC address is selected as root

D.

The switch with the lowest MAC address is selected as root.

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