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4A0-105 Nokia Virtual Private LAN Services Free Practice Exam Questions (2025 Updated)

Prepare effectively for your Nokia 4A0-105 Nokia Virtual Private LAN Services certification with our extensive collection of free, high-quality practice questions. Each question is designed to mirror the actual exam format and objectives, complete with comprehensive answers and detailed explanations. Our materials are regularly updated for 2025, ensuring you have the most current resources to build confidence and succeed on your first attempt.

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Total 156 questions

When a PE node receives a PBB encapsulated frame on a B-VPLS, how does the PE determine which l-VPLS it belongs to?

A.

The l-TAG in the l-SID is inspected to determine where the frame should be delivered.

B.

When the B-MAC header is stripped the customer MAC address is then looked up in the FDB

C.

The l-SID in the l-TAG is inspected to determine where the frame should be delivered.

D.

The PE inspects the service label in the MPLS header before stripping the B-MAC header.

MC-LAG is only supported on network ports.

A.

TRUE

B.

FALSE

What is the name of the feature supported on the Nokia 7750 SR that prevents MAC explosion in large VPLS deployments?

A.

H-VPLS

B.

M-VPLS

C.

PBB

D.

MC-EP

Click on the exhibit below.

Study the diagram shown. What consideration should be given to the transport tunnel of SDP 300?

A.

The SDP must be configured to use GRE encapsulation.

B.

The SDP must follow the same path as the user's SDP.

C.

The SDP should be configured to use an RSVP signaled transport with fast reroute.

D.

The SDP must be the same as the user's SDP.

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.

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.

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

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

Which OAM tool can be used to dynamically learn the MAC address of a CE device connected to a SAP within a VPLS service?

A.

oam mac-populate

B.

oam mac-ping

C.

oam mac-trace

D.

oam svc-ping

E.

oam cpe-ping

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.

Click on the exhibit below.

Assume the port on CE-A is sending two tags, a top tag of 100 and a bottom tag of 500. PE-A is configured with a SAP id of 1/1/1:100.*. How should PE-B be configured if CE-B is expecting a top tag of 200 and a bottom tag of 500?

A.

PE-B will require a SAP id of "sap 1/1/1:500*".

B.

PE-B will require a SAP id of "sap 1/1/1:100*".

C.

PE-B will require a SAP id of "sap 1/1/1:500.200".

D.

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

How do user VPLSs become associated with a management VPLS for redundant spoke-sdp connections?

A.

The association must be defined in the user VPLS service.

B.

The association is done when the user VPLS is associated with the same sdp-id in the management VPLS

C.

The association is based on service IDs.

D.

The association is based on customer IDs.

How is the Primary Bridge chosen in a VPLS?

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.

Consider a large metro-to-metro VPLS network interconnected with a mesh of mesh-SDPs. Which of the following statements does NOT apply to this situation?

A.

Bandwidth and replication inefficiency can occur on inter-metro links if there is a lot of multicast traffic

B.

The number of control sessions grows exponentially in a fully meshed network.

C.

Spanning-tree is required to prevent loops when using mesh SDPs on the inter-metro links.

D.

Network touches increase with each node added to the mesh.

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?

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

In the IEEE 802.1 ag, how are merged services detected?

A.

The MEP sees the CFM frame from a different MEG.

B.

The MEP sees a different service-id in the frame sent by a MEP.

C.

The MIP transmits the service-id for each service. The MIP should only see it's own service-id.

D.

This is a function of 802,3ah EFM,

Redundant spoke-SDPs are used between 2 Metro networks for redundancy. How can load balancing be achieved across the redundant spoke-SDPs?

A.

A single management VPLS using RSTP can be used to block different SDPs for different VPLS services.

B.

A single management VPLS using 802.1D-2004 can be used to block different SDPs for different VPLS services

C.

There is no way to have load balancing across redundant spoke-SDPs.

D.

Two management VPLS using RSTP can be used to block different SDPs for different VPLS services.

Click on the exhibit below.

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

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.

Click on the exhibit below.

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?

A.

sap 1/1/1:200.100

B.

sap 1/1/1:200*

C.

sap 1/1/1:*

D.

sap 1/1/1:0*

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

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

Which of the following is a true statement?

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.

Which physical topology is NOT commonly deployed in today's VPLS networks?

A.

Ring topologies.

B.

Metro-to-metro topologies

C.

H-VPLS topologies.

D.

Partial-mesh topologies.

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