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Nokia Virtual Private LAN Services Question and Answers

Nokia Virtual Private LAN Services

Last Update May 10, 2024
Total Questions : 156

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Questions 1

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

Discussion 0
Questions 2

Click on the exhibit below.

Based on the service-mtu of this B-VPLS, what is the maximum service-mtu of any connecting I-VPLS attached to this B-VPLS?

Options:

A.  

9100 bytes

B.  

9104 bytes

C.  

9108 bytes

D.  

9118 bytes

Discussion 0
Questions 3

Which of the following are true when ports are configured with the IEEE 802.3ah Loopback Control feature? (Choose 3)

Options:

A.  

The loopback control PDU instructs the remote port to enter loopback mode.

B.  

Putting a port in loopback does not affect customer data flow

C.  

Both ports must rediscover the OAM capabilities of each other once the port is put back into service.

D.  

Both ports must still send Information PDUs to avoid going back to discovery mode.

E.  

When a port is in loopback mode, service mirroring will still work if it is a mirror-source or mirror-destination.

F.  

All packets, except for information PDUs, are looped back.

Discussion 0
Questions 4

In RSTP, how is the root bridge selected?

Options:

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.

Discussion 0
Questions 5

In IEEE 802.1ag, how are loops detected?

Options:

A.  

Spanning-tree BPDUs are returned to the sender.

B.  

The MEP sees its own CFM frames returned to itself.

C.  

This is not a function of IEEE 802.lag but of 802.1D

D.  

The record field of the CFM frame keeps track of chassis-mac addresses.

Discussion 0
Questions 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.

Discussion 0
Questions 7

The operation of a VPLS can be best described by which of the following statements?

Options:

A.  

A frame should be sent to the PE that connects to the target site whenever possible.

B.  

A frame should be flooded as little as possible.

C.  

Customer frames should be switched based on the destination MAC address.

D.  

All of the above.

E.  

Only (a) and (b) are true.

Discussion 0
Questions 8

Click on the exhibit below.

CE-A is on VLAN 200 and CE-B is on VLAN 300. Which of the following SAP ids can be configured on PE-A and PE-B to allow direct communication between CE-A and CE-B?

Options:

A.  

PE-A will require a SAP id of "sap 1/1/1:200" and PE-B will require a SAP id of "sap 1/1/1:300.

B.  

PE-A will require a SAP id of "sap 1/1/1" and PE-B will require a SAP id of "sap 1/1/1".

C.  

PE-A will require a SAP id of "sap 1/1/1:0" and PE-B will require a SAP id of "sap 1/1/1:0".

D.  

PE-A will require a SAP id of "sap 1/1/1:*" and PE-B will require a SAP id of "sap 1/1/1:*".

Discussion 0
Questions 9

Click on the exhibit below.

How many LSPs are required in total between Metro A and Metro B if 100 hierarchical VPLS services are deployed across the two metro networks?

Options:

A.  

100

B.  

200

C.  

1

D.  

2

Discussion 0
Questions 10

Click on the exhibit below.

The following IP filter has been configured and applied to a SAP in a non-VPLS service. Which of the following statements is true?

Options:

A.  

An error will be generated and the configuration will not be allowed.

B.  

The filter entry will be ignored and traffic matching the criteria will be forwarded

C.  

All traffic matching entry 20 will be dropped.

D.  

Traffic matching entry 20 will be forwarded to sdp 100:1.

Discussion 0
Questions 11

Click on the exhibit below.

Assume there are two VPLS services configured on the MDU. How could load-balancing be achieved when using Active/Standby pseudowires?

Options:

A.  

This cannot be done.

B.  

Each VPLS will use the same pair of SDP's with the same endpoint configured with the option "load-balancing 2".

C.  

Each VPLS will need their own pair of spoke-SDP's configured. The spoke-sdp's that are to be active should be configured with the option "precedence primary".

D.  

Under the end-point configuration, enable load-balancing 2 and the MDU will load balance automatically.

Discussion 0
Questions 12

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

Options:

A.  

1500

B.  

1514

C.  

1518

D.  

It depends on the access port MTU.

E.  

It depends on the network port MTU.

Discussion 0
Questions 13

How is the Primary Bridge chosen in a VPLS?

Options:

A.  

The PE devices participating in the VPLS mesh run a separate Spanning Tree instance in the Core. The Primary Bridge is the Root Bridge for the VPLS mesh.

B.  

The PE devices participating in the VPLS mesh determine which bridge is closest to Root Bridge. This bridge becomes the Primary Bridge.

C.  

The PE devices participating in the VPLS mesh determine which bridge has the lowest bridge-id. This bridge becomes the Primary Bridge.

D.  

The PE devices participating in the VPLS mesh determine which bridge is the Root Bridge. This becomes the Primary Bridge.

Discussion 0
Questions 14

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?

Options:

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.

Discussion 0
Questions 15

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

Discussion 0
Questions 16

Click on the exhibit below.

Which bridge will become the root bridge?

Options:

A.  

Bridge B

B.  

Bridge C

C.  

Bridge D

D.  

Bridge E

Discussion 0
Questions 17

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

Options:

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.

Discussion 0
Questions 18

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

Options:

A.  

5-one for each service.

B.  

2-one in each direction.

C.  

10-five in each direction.

D.  

None of the above.

Discussion 0
Questions 19

What of the following is a key benefit of Active/Standby pseudowires?

Options:

A.  

The MDU does not need to support MPLS.

B.  

Can be used in ring networks of 4 or more nodes

C.  

Does not require the use of a layer 2 loop prevention protocol such as RSTP

D.  

The MDU does not have to be aware of the active/standby configuration

Discussion 0
Questions 20

Multiple VPLS services can be offered over the same set of LSP tunnels?

Options:

A.  

TRUE

B.  

FALSE

Discussion 0
Questions 21

Which of the following OAM tools can be used as a VPLS topology discovery mechanism (Choose 2)?

Options:

A.  

oam mac-ping

B.  

oam mac-populate

C.  

oamsvc-ping

D.  

oam mac-trace

Discussion 0
Questions 22

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.

Discussion 0
Questions 23

The command "send flush-on-failure" has been enabled within a VPLS instance. What does the PE do upon detection of a SAP failure within the VPLS?

Options:

A.  

The PE sends an LDP control message that flushes all FDB entries in the VPLS instance.

B.  

The PE sends an LDP control message that flushes all FDB entries in the VPLS instance that are associated with the PE that detected the failure.

C.  

The PE flushes it's local FDB only.

D.  

The PE sends an oam service message that flushes all FDB entries in the VPLS instance.

Discussion 0
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