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Guide for 4A0-103: Nokia Multiprotocol Label Switching

Quiz 4A0-103: Nokia Multiprotocol Label Switching

Updated on 2026/09/26

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Guide for 4A0-103: Nokia Multiprotocol Label Switching

Updated on 2026/09/26

Randomized | 10 Questions per Test | 20 Minutes | 70% to pass

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4.7

Quiz

Question 1/101/10

You wish to advertise LDP labels for all local networks; which is the most effective policy statement to
use?

Select the answer:Select the answer

1 correct answer

from prefix-list direct

match local

from protocol direct

match protocol direct

from protocol local

Quiz

Question 2/102/10

Which of the following indicates the path over which an LSP's tail end router will return an RSVP RESV
message?

Select the answer:Select the answer

1 correct answer

The IGP FIB.

The Reservation State Block (RSB)

The Path State Block (PSB)

The opaque database.

Quiz

Question 3/103/10

Click on the exhibit button below.

Certification Exam 4A0-103: Nokia Multiprotocol Label Switching Nokia Nokia-4A0-103 1-1403963344

With fast reroute enabled, and given the following:
Two protected LSPs with the path R1-R2-R3
Both LSPs enable facility bypass and link protection.
When router R1 is the PLR, which router becomes the MP?

Select the answer:Select the answer

1 correct answer

Router R1

Router R2

Router R3

Router R4

Router R5

Quiz

Question 4/104/10

Click on the exhibit button below.

Certification Exam 4A0-103: Nokia Multiprotocol Label Switching Nokia Nokia-4A0-103 2-477995347

Given the output below, which of the following statements are true? (Choose three)

Select multiple answer: (Choose 3)Select the answer

3 correct answers

A packet arriving with label 131066 and destined for prefix 10.10.10.243/32 will be forwarded out interface 1/1/4, with label 131070.

LDP ECMP is enabled.

The router’s system address is 10.10.10.242/32.

There are multiple LSPs to reach FEC 10.10.10.244/32.

The router cannot receive any unlabeled packets destined for prefix 10.10.10 223/32.

The correct answers are A, B, and D.
Here is why each statement is true or false based on the exhibited MPLS/LDP forwarding information:
A. A packet arriving with label 131066 and destined for prefix 10.10.10.243/32 will be forwarded out interface 1/1/4, with label 131070.
True.
The exhibit shows a label swap operation for that FEC. In MPLS forwarding, an incoming label is matched against the LFIB entry, and the router swaps it to the outgoing label while forwarding it to the listed outgoing interface. Since the output indicates that label 131066 is associated with forwarding toward 10.10.10.243/32 via interface 1/1/4 and the new label is 131070, this statement is correct.
B. LDP ECMP is enabled.
True.
The exhibit shows multiple equal-cost label paths being installed for the same FEC. When LDP ECMP is enabled, the router can use multiple next hops and multiple label bindings for the same destination prefix. The presence of multiple forwarding entries to the same FEC indicates ECMP behavior.
C. The router’s system address is 10.10.10.242/32.
False.
A router’s LDP system address is typically the loopback or router ID used as the transport address for LDP sessions. The exhibit does not support that the system address is 10.10.10.242/32; instead, 10.10.10.242/32 appears to be one of the FECs/prefixes in the table, not necessarily the system address of the router itself.
D. There are multiple LSPs to reach FEC 10.10.10.244/32.
True.
The exhibit shows more than one label path toward the FEC 10.10.10.244/32. Multiple label-switched paths to the same FEC mean the router has installed multiple LSPs, usually because of ECMP or multiple next-hop resolution.
E. The router cannot receive any unlabeled packets destined for prefix 10.10.10.223/32.
False.
This is too strong a statement. Even in an MPLS-enabled network, a router can still receive unlabeled IP packets for a destination prefix, depending on how traffic enters the network or whether the packet arrives from a non-MPLS neighbor or locally attached source. The exhibit does not prove that unlabeled packets cannot be received for that prefix.
Summary:
A is true because the label swap and outgoing interface match the forwarding entry.
B is true because multiple equal-cost label paths are shown.
D is true because there are multiple LSPs for the same FEC.
Therefore, the correct answer is A, B, and D.

Right Answer: A, B, D

Quiz

Question 5/105/10

Which of the following statements best describe MPLS fast reroute characteristics? (Choose two)

Select multiple answer: (Choose 2)Select the answer

2 correct answers

Fast reroute requires you to manually define detour paths.

Fast reroute provides path protection close to the failure point

Fast reroute performs automatic path calculation and signaling.

Fast reroute protects both primary and secondary paths.

The correct answers are B and C.
MPLS fast reroute (FRR) is a mechanism designed to provide very fast traffic recovery when a link or node fails in an MPLS network. Its key purpose is to minimize traffic interruption by quickly switching traffic to a preplanned backup path.
Why B is correct:
"Fast reroute provides path protection close to the failure point"
This is a core feature of MPLS FRR. The protection path is typically established near the protected resource, such as a link or node, so that traffic can be rerouted locally as soon as a failure is detected. This local protection allows recovery in very short times, often much faster than waiting for a full IGP or RSVP-TE reconvergence.
Why C is correct:
"Fast reroute performs automatic path calculation and signaling"
MPLS FRR uses automatically calculated backup resources and signaling to establish protection paths ahead of time. Once a failure occurs, the network can immediately use the precomputed backup without manual intervention. This automation is one of the main reasons FRR is effective for fast restoration.
Why A is incorrect:
"Fast reroute requires you to manually define detour paths"
This is not generally true. MPLS FRR is intended to automate protection setup. While some implementations or configurations may allow explicit control, the basic characteristic of FRR is automatic backup path computation and setup, not manual definition of detour paths.
Why D is incorrect:
"Fast reroute protects both primary and secondary paths"
FRR does not typically mean protecting both the working and backup paths simultaneously. Instead, it protects the primary traffic path by providing a backup route that can be used if the primary fails. The focus is on fast recovery for the primary path, not on protecting both paths as separate entities.
Summary:
MPLS fast reroute is characterized by local protection near the failure point and automatic backup path calculation and signaling, so the best choices are B and C.

Right Answer: B, C

Quiz

Question 6/106/10

During node protection signaling, the PLR knows the address of the MP from which of the following
methods?

Select the answer:Select the answer

1 correct answer

The PLR issues a RSVP path message to the destination router to request the address of the MP.

The PLR learns the address of the MP from the ERO.

The PLR learns the address of the MP from the RRO

The PLR learns the address of the MP from the targeted RSVP hello message.

The PLR does not need to know the address of the MP.

Quiz

Question 7/107/10

What is the significance of receiving a packet with the bottom MPLS label S bit set to 1?

Select the answer:Select the answer

1 correct answer

It results in forwarding based on the next packet header.

It indicates that the label is the bottom of the MPLS label stack.

It indicates that the label is the top of the MPLS label stack.

Any LSR that receives an S bit set to 1 must discard the packet.

Quiz

Question 8/108/10

Which command can be used to verify the LDP settings for label distribution and retention?

Select the answer:Select the answer

1 correct answer

show router ldp default

show router ldp parameters

show router ldp settings

show router mpls settings

show router mpls label-options

Quiz

Question 9/109/10

Router R3 signals an LSP, reserving 1Gbps bandwidth on a 10Gbps link. RSVP configuration limits
reservable bandwidth to 20 percent on the egress interface. Which of the following statements is true?

Select the answer:Select the answer

1 correct answer

The egress RSVP interface has 80 percent bandwidth unreserved.

LSPs can reserve an additional 9.9 Gbps bandwidth on this RSVP interface.

The head end reserves 100Mbps for the LSP

The egress RSVP interface has 1 Gbps bandwidth unreserved.

Quiz

Question 10/1010/10

Click on the exhibit button below.

Certification Exam 4A0-103: Nokia Multiprotocol Label Switching Nokia Nokia-4A0-103 3-645192568

Assuming that LSP R1-R2-R3 requests the default fast reroute configuration, which router becomes a
DMP for the detour tunnels?

Select the answer:Select the answer

1 correct answer

Router R1

Router R2

Router R3

Router R4

Router R5

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Quiz name:4A0-103: Nokia Multiprotocol Label Switching
Total number of questions:249
Number of questions for the test:50
Pass score:80%

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