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

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Nokia Virtual Private LAN Services Questions and Answers

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Question 1

Why is it best practice to set the bridge priority in an STP network? (Choose 2)

Options:

A.

This is not a best practice. Any switch can be used as the root bridge.

B.

So that you know which links will be active in your network.

C.

To prevent a new switch from becoming root when added to the network.

D.

To allow all ports on the root switch to become alternate ports.

Question 2

What is the default Spanning Tree protocol used in a VPLS on the Nokia 7750 SR?

Options:

A.

802.1D2004

B.

802.1D 1998

C.

comp-dot1w

D.

PVST

Question 3

Click on the exhibit below.

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 4

Click on the exhibit below.

Management VPLS 100 has been created for redundant spoke-SDP connections. User VPLSs 10 and 20 are using the same spoke-SDPs that are being managed by VPLS 100. Unexpected behavior has been reported. Based on the following output, what is the most likely reason for the unexpected behavior?

Options:

A.

VPLS 100 was not actually configured as a management VPLS.

B.

VPLS 10 and VPLS 20 are not actually configured as a user VPLS.

C.

VPLS 10 and VPLS 20 are not using the same spoke-sdps that the management VPLS is using.

D.

Based on the output there is now way of telling if there is a problem with the configuration.

Question 5

Which of the following functions must a PE router support when participating in a VPLS service? (Choose 3)

Options:

A.

MAC learning

B.

Frame replication

C.

Frame fragmentation

D.

Frame forwarding

E.

Must discard frames with an unknown destination MAC

F.

MSTP

Question 6

Which of the following describes the setting of the l-SID on the Nokia 7750 SR?

Options:

A.

The I-SID is set to 0 by default and is only used for interop purposes. The receiving PE uses the service label to determine the I-VPLS.

B.

There is no default value. The I-SID must always be explicitly configured

C.

The I-SID is set to the service-id, unless the service-id is larger than a 24 bit value. In this case the I-SID must be explicitly configured.

D.

The I-SID is always set to the service-id by default.

Question 7

Click on the exhibit below.

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 8

Which of the following is NOT a feature of the IEEE 802.3ah EFM standard?

Options:

A.

Discovery and auto-negotiation of OAM capabilities.

B.

Link monitoring via event notifications.

C.

Remote failure indication (RFI).

D.

Remote Loopback

E.

Latency and jitter across a service.

Question 9

Which of the following statements relating to VPLS is false?

Options:

A.

A VPLS is a multipoint Layer 2 service.

B.

A VPLS allows multiple customer sites to be connected in a single bridged domain.

C.

A VPLS on a single node requires a SDP.

D.

With an IP/MPLS infrastructure, service providers can provide multiple VPLS services over a common IP/MPLS infrastructure.

E.

The VPLS switches traffic based on MAC address associated to the appropriate SAP.

Question 10

Fill in the blank for this next sentence. Flooded traffic received on any ____________ in the service is replicated to other spoke SDPs and SAPs and not transmitted on any mesh SDPs.

Options:

A.

Spoke SDP

B.

Mesh SDP

C.

Either (a) or (b) will make this sentence true.

D.

Neither (a) nor (b) will make this sentence true.

Question 11

Which of the following technologies allows for two explicit VLAN tags to be received from a customer device?

Options:

A.

RSVP-TE

B.

SP-VLAN

C.

QinQ

D.

Dot1Q

Question 12

Click on the exhibit below.

The MDU attached to this PE has been configured with active/standby SDP's configuration option has been configured for the PE to recognize that this SDP is in standby mode?

Options:

A.

On the PE the endpoint has been configured with "supress-standby-signalling"

B.

On the PE the endpoint has been configured with "no supress-standby-signalling"

C.

On the MDU the endpoint has been configured with "supress-standby-signalling"

D.

On the MDU the endpoint has been configured with "no supress-standby-signalling1

Question 13

Click on the exhibit below.

The VPLS service MTU on R2 is 1514 bytes. What must the service MTU be on all other routers participating in the VPLS?

Options:

A.

The service MTU must be equal to or smaller than 1514 bytes.

B.

The service MTU must be 1514 bytes.

C.

The service MTU must be equal to or greater than 1514 bytes.

D.

The service MTU can be any value.

Question 14

During the process of troubleshooting a VPLS problem the "oam mac-purge" command with "register" option was used to purge a MAC address from the FDB. Which of the following statements is true?

Options:

A.

Relearning of the MAC address that was purged can only be done once customer traffic resumes.

B.

Relearning of the MAC address that was purged can only be done with the "oam mac-populate" command.

C.

Customer traffic destined to the MAC address that was purged will be dropped until the MAC address is relearned with the "oam mac-populate" command.

D.

Relearning of the MAC address that was purged can only be done with the "oam mac-register" command.

Question 15

What is the SA in the Ethernet frame used for by a layer 2 switch?

Options:

A.

MAC learning

B.

SA filtering

C.

Routing table population

D.

Frame forwarding

Question 16

In Active/Standby pseudowires a failed pseudowire has recovered. Under what circumstances will the active pseudowire revert to the previously failed link?

Options:

A.

It will always revert to the previously failed link.

B.

It will never revert to the previously failed link.

C.

It will revert if the precedence of the previously failed link is set to 0 or "primary".

D.

It will revert if the precedence of the previously failed link is lower than the currently active link

Question 17

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 18

The service mtu of a VPLS is set to 9100. What is the recommended MTU value that can be set for the access port assuming dot1q encapsulation?

Options:

A.

9100

B.

9104

C.

9108

D.

9122

E.

9126

Question 19

After the "disable-learning" command has been executed at the VPLS level, a new client device originates a frame. What is the result?

Options:

A.

If the MAC address of this new client device does not reach the upper limit of the configured total number of MAC addresses allowed in the VPLS forwarding database, then the new MAC address will be stored.

B.

The new source MAC addresses will not be entered in the VPLS service forwarding database.

C.

New local source MAC addresses will not be entered in the VPLS service forwarding database, but new remote MAC addresses would continue to be entered.

D.

New remote source MAC addresses will not be entered in the VPLS services forwarding database, but new local MAC addresses would continue to be entered.

Question 20

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?

Options:

A.

The frame will be forwarded out the port associated with the DA.

B.

The frame will be discarded.

C.

The frame will be flooded to all ports.

D.

The frame will be fragmented and forwarded out the port associated with the DA.

Question 21

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.

Options:

A.

A Spanning Tree BPDU will be sent across the mesh flushing the FDB table in all devices participating in the VPLS instance.

B.

Stale information will be used within the VPLS instance to forward traffic until the FDB ages out.

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.

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.

Question 22

In IEEE 802.1ag, which two key functions are configured on bridge ports (SAPs and SDPs) to support CFM messages? (Choose 2)

Options:

A.

MEP

B.

MAP

C.

MIP

D.

MUP

Question 23

Click on the exhibit below.

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

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