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Nokia 4A0-105 Nokia Virtual Private LAN Services Exam Practice Test

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Total 156 questions
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Nokia Virtual Private LAN Services Questions and Answers

Question 1

Which of the following needs to be considered when designing Ethernet networks with redundancy?

Options:

A.

Processing the TTL takes extra time.

B.

MAC learning rate is doubled.

C.

FDB size is doubled.

D.

Requires a protocol to remove loops.

Question 2

Click on the exhibit below.

Question # 2

CE-A sends frames with 2 tags. If the SAP on PE-A is "sap 1/1/1:1 .*" and the SAP on PE-B is "sap 1/1/1:100.200" how many tags will there be on the frame when it egresses from the SAP on PE-B?

Options:

A.

0

B.

1

C.

2

D.

3

Question 3

Click on the exhibit below.

Question # 3

Which port will become the alternate port?

Options:

A.

Bridge B 1/1/3

B.

Bridge B 1/1/2

C.

Bridge C 1/1/2

D.

Bridge C 2/1/1

E.

Bridge D 1/1/1

F.

Bridge D 1/1/3

G.

Bridge E 1/1/1

Question 4

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

Options:

A.

TRUE

B.

FALSE

Question 5

What function in IEEE 802.1 ah helps to limit the amount of MAC addresses learned in the core?

Options:

A.

I-VPLS is configured in the core of the network with an l-MAC address. This l-MAC address is the only MAC learned in the core

B.

The B-VPLS and l-VPLS are configured in the edge. The B-VPLS is configured with a Backbone MAC and is the only MAC learned in the core

C.

Each SDP is configured with a Backbone MAC to hide customer MAC addresses in the core

D.

Each SAP is associated with a common l-MAC to hide customer MAC addresses in the core

Question 6

What action will be taken when an MPLS router receives a frame with a label that does not exist in the LFIB?

Options:

A.

The frame will be flooded.

B.

The frame will be discarded.

C.

The frame will be fragmented.

Question 7

A router has just learned the 10th MAC address while the FDB size is also set to 10. What is the likely outcome?

Options:

A.

The frame is dropped.

B.

The frame is always flooded

C.

The frame is forwarded and MAC learning is automatically disabled.

D.

The frame is discarded if the destination is unknown.

E.

More information is required to determine the fate of this new frame.

Question 8

How does PBB forward broadcast, unknown-unicast and multicast traffic from a B-VPLS to an l-VPLS?

Options:

A.

The receiving PE checks the l-TAG in the l-SID to determine if there is a local l-VPLS on the node.

B.

The receiving PE checks the l-SID in the l-TAG to determine if there is a local l-VPLS on the node.

C.

The receiving PE checks the service label in the mpls header to determine if there is a local l-VPLS on the node.

D.

The receiving PE checks the multicast B-DA to see if an l-SID has been mapped to the B-DA that matches a local l-VPLS on the node.

Question 9

Click on the exhibit below.

Question # 9

The following VPLS services and SAPs have been configured. Which of the following statements is true?

Options:

A.

All untagged frames will be dropped.

B.

The source MAC address of a frame with a top tag of 200 and bottom tag of 300 will be populated in VPLS 3.

C.

All frames with more than one tag will be dropped.

D.

The source MAC address of a frame with a single tag of 500 will be populated in VPLS 1.

E.

The source MAC address of a frame with a top tag of 100 will be populated in VPLS 2.

Question 10

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

Options:

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

Question 11

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

Options:

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.

Question 12

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

Options:

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.

Question 13

Assuming TLDP and RSVP are both being used in an MPLS network core which of the following statements is true?

Options:

A.

TLDP is used to create the inner label, RSVP is used to create the outer label.

B.

TLDP is used to create the outer label, RSVP is used to create the inner label.

C.

TLDP and RSVP cannot be used in the same network since they both provide the same label.

D.

When RSVP is used, TLDP must be disabled and static vc labels should be used.

E.

TLDP and RSVP can be used to create either labels based on how they are configured.

Question 14

Click on the exhibit below.

Question # 14

Based on the output below which of the following statements is true? (Choose 2)

Options:

A.

VPLS1500 is a user VPLS.

B.

VPLS 1500 is management VPLS.

C.

Spanning tree BPDUs for the management VPLS are tagged.

D.

Spanning tree BPDUs for the management VPLS are untagged.

Question 15

In Rapid Spanning Tree Protocol, a Backup Port is on the same switch as a Designated Port?

Options:

A.

TRUE

B.

FALSE

Question 16

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?

Options:

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.

Question 17

Click on the exhibit below.

Question # 17

Which ports will become root ports? (Choose 3)

Options:

A.

Bridge B 1/1/3

B.

Bridge B 1/1/2

C.

Bridge C 1/1/2

D.

Bridge C 2/1/1

E.

Bridge D 1/1/1

F.

Bridge D 1/1/3

G.

Bridge E 1/1/1

Question 18

The "discard-unknown" command has been enabled at the VPLS level. Which of the following statements is true? (Choose 2)

Options:

A.

Broadcast traffic will be flooded.

B.

If the unicastSA has not been learned in the FDB, the frame will be dropped.

C.

If the unicast DA has not been learned in the FDB, the frame will be dropped.

D.

All traffic will be dropped, including multicast and broadcast.

E.

Broadcast traffic will be dropped.

Question 19

Click on the exhibit below.

Question # 19

Given the following output what is the most likely reason the SDP binding is operationally down? (Choose 2)

Options:

A.

The sdp id is different on the far-end.

B.

LDP is disabled on the far-end.

C.

The vc-id is different on the far-end.

D.

The mesh-sdp is missing on the far-end.

E.

The mesh-sdp is administratively shutdown on PEL

F.

There is an MTU mismatch.

Question 20

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

Options:

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.

Question 21

Click on the exhibit below.

Question # 21

You have been requested to add load balancing across the redundant spoke-SDPs in the network shown. What further configuration is required? (Choose 2)

Options:

A.

An additional management VPLS.

B.

Another set of LSPs between PE1 and PE3 and between PE2 and PE4.

C.

Another set of SDPs between PE1 and PE3 and between PE2 and PE4.

D.

Load balancing has to be enabled within the management VPLS.

Question 22

What option is available when using PBB to reduce the amount of required VPLS services?

Options:

A.

The Nokia 7750 SR supports 1:1 mapping of I-VPLS services to B-VPLS services.

B.

The Nokia 7750 SR supports 1:1 andM:1 mapping of l-VPLS services to B- VPLS services.

C.

The Nokia 7750 SR supports the mapping of multiple, standard VPLS services to B-VPLS services.

D.

The Nokia 7750 SR supports the mapping of multiple, standard VPLS services to l-VPLS services.

Question 23

Which of the following statements about Spanning Tree Protocol is true?

Options:

A.

The switch with the lowest priority becomes the root.

B.

The switch with the highest priority becomes the root.

C.

The switch with the lowest MAC address always becomes the root.

D.

The switch with the highest MAC address always becomes the root.

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