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

Questions 4

Which of the following is a true statement?

Options:

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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Questions 5

The service-mtu of a VPLS using MPLS encapsulation is set to 9100. What is the minimum MTU value that can be set for the network port if fast re-route facility mode is used on the SDP LSP?

Options:

A.

9100

B.

9104

C.

9108

D.

9122

E.

9126

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Questions 6

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.

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Questions 7

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.

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Questions 8

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

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Questions 9

An l-VPLS is configured with a service id of 511. What will the value of the l-SID be assuming a default configuration?

Options:

A.

The 1-SID must be explicitly configured.

B.

The 1-SID only supports a range from 1 to 255.

C.

The 1-SID will default to 511 .the value of the service-id.

D.

Thel " SIDwilldefaultto131582, the value of the service-id + 131071.

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Questions 10

Click on the exhibit below.

4A0-105 Question 10

Based on the following configuration which VLANs will be managed by the management VPLS?

Options:

A.

VLANs 1-4094

B.

VLAN 0

C.

There is not enough information provided

D.

None, this is an invalid configuration

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Questions 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?

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.

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Questions 12

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.

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Questions 13

Click on the exhibit below.

4A0-105 Question 13

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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Questions 14

Which of the following must be true in order to add a port to a LAG? (Choose 2)

Options:

A.

ports must be on the same MDA

B.

ports must have the same speed and duplex settings

C.

auto negotiation must be on

D.

auto negotiation must be off or limited

E.

port must be in access mode only

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Questions 15

Click on the exhibit below.

4A0-105 Question 15

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.

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Questions 16

Click on the exhibit below.

4A0-105 Question 16

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

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Questions 17

Click on the exhibit below.

4A0-105 Question 17

A new router named PE-D is to be directly connected to PE-C and is required to be added to the existing VPLS 300. The design requires the least amount of signaling, the least amount of configuration changes for existing sites and the new site has to have access to all existing sites. How should the new site be added to VPLS 300?

Options:

A.

Configure a mesh-sdp between all existing PE routers and the new PE router

B.

Configure a mesh-sdp between PE-C and PE-D

C.

Configure a spoke-sdp between PE-C and PE-D.

D.

It is not possible to meet the design requirements.

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Questions 18

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

Options:

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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Questions 19

When spanning tree is enabled within a VPLS service and the STP mode is 802.1 D 2004 what happens if a PVST BPDU is received on a SAP?

Options:

A.

Spanning tree will be disabled on the SAP that the PVST BPDU was received on.

B.

The SAP that the PVST BPDU was received on will be disabled to prevent loops.

C.

The spanning tree encapsulation will be dynamically changed to PVST on the SAP the PVST BPDU was received on.

D.

The PVST BPDU will be ignored and 802.1D 2004 BPDUs will continue to be transmitted on the SAP.

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Questions 20

If a management VPLS is administratively disabled what will be the status of the associated user VPLS SAPs?

Options:

A.

Regular semantics will apply. It will be as if the SAP doesn ' t belong to a management VPLS.

B.

All user VPLS SAPs will be disabled/pruned.

C.

It is not possible to administratively disable a management VPLS.

D.

Spanning tree will be automatically enabled on the user VPLS SAPs.

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Questions 21

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

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Questions 22

MC-LAG provides link and node protection from an MDU to 3 or more PE devices.

Options:

A.

TRUE

B.

FALSE

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Questions 23

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

Options:

A.

TRUE

B.

FALSE

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Questions 24

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.

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Questions 25

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.

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Questions 26

How can one ensure that a specific switch will be select as root in an STP network?

Options:

A.

Set the bridge priority to 131071.

B.

Set the bridge priority to 0.

C.

Set the bridge priority to 32768.

D.

Leave the bridge priority as the default.

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Questions 27

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

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Questions 28

Which protocol is used to signal the status of the active links between the PE and the CE in MC-LAG?

Options:

A.

MSTP

B.

MCLAG

C.

LACP

D.

DHCP

E.

A proprietary protocol

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Questions 29

What scaling factors should a network engineer be aware of when designing VPLS networks? (Choose 3)

Options:

A.

Control plane scaling.

B.

Data plane scaling.

C.

Network touches.

D.

Route table reduction.

E.

OAM tools.

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Questions 30

Click on the exhibit below.

4A0-105 Question 30

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

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Questions 31

Click on the exhibit below.

4A0-105 Question 31

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

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Questions 32

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.

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Questions 33

Why is MAC explosion a factor to be considered when designing a large VPLS network? (Choose 2)

Options:

A.

The time to relearn thousands of MAC addresses may result in excessive flooding or loss of packets.

B.

If the FDB reaches the limit, the router will discard frames.

C.

Discarding frames when the FDB limit is reached could deny SLA guarantees.

D.

It could take several seconds to relearn thousands of MAC addresses denying QoS/SLA guarantees.

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Questions 34

What must be enabled in order to prevent a loop within a LAG?

Options:

A.

RSTP

B.

Dynamic-cost

C.

LACP active

D.

Nothing, There are no loops in LAGs

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Questions 35

What is the DA address used for in the Ethernet Header?

Options:

A.

MAC learning

B.

SA filtering

C.

Routing table population

D.

Frame forwarding

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Questions 36

Which of the following is a function of the data plane that must be considered when provisioning a VPLS service?

Options:

A.

Number of LSPs.

B.

Number of TLDP sessions.

C.

Number of SDPs.

D.

MAC address consumption in the FDB.

E.

Bandwidth and replication requirements.

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Questions 37

Click on the exhibit below.

4A0-105 Question 37

Given the following configuration, which service type will VPLS 1 and VPLS 100 be displayed as with the " show service service-using " command?

Options:

A.

VPLS 1 will be displayed as mVPLS and VPLS 100 will be displayed as VPLS.

B.

VPLS 1 will be displayed as mVPLS and VPLS 100 will be displayed as uVPLS

C.

VPLS 1 will be displayed as VPLS and VPLS 100 will be displayed as VPLS.

D.

VPLS 1 will displayed VPLS and VPLS 100 will be displayed as uVPLS.

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Questions 38

Click on the exhibit below.

4A0-105 Question 38

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.

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Questions 39

Why should you configure send-flush-on failure on your PE routers when using active/standby pseudowires?

Options:

A.

It flushes the local FDB speeding recovery

B.

It discards all packets in the queue and sends icmp-discad messages to the sender. The packets are re-transmitted resulting in no loss of data.

C.

On failure, the PE sends an LDP flush-all-from-me message to all PE devices in the VPLS. This speeds convergence to the new topology.

D.

It is not important to use send-flush-on-failure as Active/Standby signalling automatically converges the FDB in all VPLS instances

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Questions 40

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.

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Questions 41

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.

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Questions 42

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

Options:

A.

The same as the number of alternate ports in the topology

B.

1 per segment

C.

The same as the number of root ports

D.

1 per switch

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Questions 43

Which of the following is a true statement?

Options:

A.

In a dynamic environment where MAC addresses are changing rapidly, the lower the age-time, the larger the fdb-table-size should be.

B.

In a dynamic environment where MAC addresses are changing rapidly, the higher the age-time, the larger the fdb-table-size should be.

C.

In a dynamic environment where MAC addresses are changing rapidly, the higher the age-time, the smaller the fdb-table-size should be.

D.

There is no relationship between the age-time and the fdb-table-size.

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Questions 44

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.

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Questions 45

Click on the exhibit below.

4A0-105 Question 45

The SAP on PE-A has been configured with dot1q encapsulation. The SAP on PE-B has been configured with qinq encapsulation. CE-A sends frames with a single tag of 100. The VLAN tag from CE-A must be passed transparently. CE-B is expecting a frame with a top tag of 200 and bottom tag of 100. Which of the following is the correct SAP id for PE-B?

Options:

A.

sap 1/1/1:200.100

B.

sap 1/1/1:200*

C.

sap 1/1/1:*

D.

sap 1/1/1:0*

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Questions 46

What type of SDP cannot be configured in an l-VPLS?

Options:

A.

Mesh-sdp

B.

Spoke-sdp

C.

MPLS

D.

GRE

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Exam Code: 4A0-105
Exam Name: Nokia Virtual Private LAN Services
Last Update: Apr 30, 2026
Questions: 156

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