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4A0-105 Exam Dumps - Nokia SRC Certification Questions and Answers

Question # 4

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.

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Question # 5

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.

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Question # 6

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

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Question # 7

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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Question # 8

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.

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Question # 9

Which of the following describes the overhead added to a customer frame on an Ethernet link in a VPLS service on the Nokia 7750 SR?

Options:

A.

The overhead consists of 26 bytes. 14 DLC + 2 Ethertype + 8 for mpls labels + 2 for GRE

B.

The overhead consists of 14 bytes for DLC.

C.

The overhead consists of 18 bytes. 14 DLC +4 for mpls labels

D.

The overhead consists of 22 bytes. 14 DLC + 8 for mpls labels

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Question # 10

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

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Question # 11

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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Question # 12

The FDB has learned 2 MAC addresses. The first is from a device accessible via a locality defined SAP, the second is from a device accessible via an SDP. Both MAC addresses were learned at the exact same time. If all traffic from these hosts stops at the same time, which address will age out first from the FDB based on default settings?

Options:

A.

MAC learned via SAP

B.

MAC learned via SDP

C.

There is not enough information to determine

D.

Both will timeout at the same time

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Question # 13

Which service component in the data plane uniquely identifies a VPLS to the far end PE node?

Options:

A.

SDP id

B.

Service ID

C.

VC Label

D.

Tunnel Label

E.

Customer id

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Exam Code: 4A0-105
Exam Name: Nokia Virtual Private LAN Services
Last Update: Apr 1, 2025
Questions: 156
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