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4A0-103 Nokia Alcatel-Lucent Multi Protocol Label Switching Free Practice Exam Questions (2025 Updated)

Prepare effectively for your Nokia 4A0-103 Alcatel-Lucent Multi Protocol Label Switching 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 249 questions

Which of the following describes 6PE?

A.

P routers run IPv4 only. PE routers run IPv4 only and exchange IPv6 routes using MP-BGP.

B.

P routers run IPv4 only. PE routers run both IPv4 and IPv6 and exchange IPv6 routes using MP-BGP.

C.

P routers run IPv6 only. PE routers run both IPv4 and IPv6 and exchange IPv4 routes using MP-BGP.

D.

P routers run IPv6 only. PE routers run IPv6 only and exchange IPv4 routes using MP-BGP.

Which of the following about MPLS shortcuts for IGP on an Alcatel-Lucent 7750 SR is FALSE?

A.

An IGP route takes priority over a transport tunnel.

B.

Both LDP and RSVP-TE based tunnels can be used.

C.

MPLS tunnels can be used to resolve the prefixes learned via IGP.

D.

Multiple MPLS tunnels can be installed in the FIB.

Which of the following about CSPF is TRUE?

A.

The tail-end router performs the CSPF calculation for an LSP.

B.

CSPF calculations are always performed on RSVP-TE based LSPs.

C.

The head-end router performs the CSPF calculation for an LSP.

D.

Each downstream router performs its own CSPF calculation for an LSP.

Click on the exhibit.

Two LSPs traverse the path R1-R2-R3. Both LSPs are configured with facility fast reroute and link protection. When router R1 is the PLR, which router becomes the Merge Point (MP) for this LSP?

A.

Router R1

B.

Router R2

C.

Router R3

D.

Router R4

E.

Router R5

Which MPLS mode saves only active label mappings received from peer LSRs?

A.

Conservative label retention

B.

Liberal label retention

C.

Downstream on demand

D.

Downstream unsolicited

Click on the exhibit.

This policy is applied on a router as an LDP export policy and an LDP session has been established between this router and its neighboring router. In addition to the FECs learned from its neighbors, what additional FECs will appear in this router's LIB?

A.

All FECs that are in the 192.168.1.0/24 address space.

B.

Local FECs that are in the 192.168.1.0/24 address space.

C.

All FECs that are not in the 192.168.1.0/24 address space.

D.

All FECs except the local FECs that are in the 192.168.1.0/24 address space.

Which of the following about the Link LDP discovery process on the Alcatel-Lucent 7750 SR is FALSE?

A.

LDP Hello messages are sent over TCP.

B.

LDP Hello messages are sent to the All Routers address 224.0.0.2.

C.

LDP Hello messages are exchanged between all directly connected LDP enabled routers.

D.

Each LDP enabled router must have its own unique system IP address.

Which of the following about an ERO in an RSVP PATH message is FALSE?

A.

ERO is used by downstream routers to determine the next-hop for the LSP.

B.

ERO contains label information used to signal an LSP path.

C.

ERO is not always present in the PATH message.

D.

Each downstream router updates information inside the ERO.

To enable the LDP-over-RSVP feature, which of the following configurations is NOT required on an Alcatel-Lucent 7750 SR?

A.

Enable the Idp-over-rsvp feature on all PEs and ABRs along the LSP tunnel.

B.

Configure Link-LDP sessions between each PE-ABR and ABR-ABR pair.

C.

Configure RSVP-TE LSPs in each area between each PE-ABR and ABR-ABR pair.

D.

Configure T-LDP sessions with the tunneling option.

Which of the following regarding the location of an MPLS label is FALSE?

A.

The MPLS label value may be carried in an ATM header.

B.

The MPLS label value may be carried in a shim header.

C.

The MPLS label value may be carried in an OSPF header.

D.

The MPLS label value may be carried in a Frame Relay header.

Which of the following about LDP sessions is TRUE?

A.

Frame mode requires multiple sessions between peers.

B.

The lower transport address initiates the session.

C.

Established LDP sessions run over a TCP connection.

D.

An LDP session is established immediately after Init messages are exchanged between peers.

Which of the following about label modes on the Alcatel-Lucent 7750 SR is FALSE?

A.

RSVP uses downstream on demand label distribution mode.

B.

LDP uses conservative label retention mode.

C.

LDP advertises label mappings to all peers for which it might be a next-hop for a given FEC.

D.

RSVP distributes a label mapping for a FEC when it has been requested to do so.

Facility fast reroute with node protection is enabled for an LSP, which of the following is FALSE?

A.

Each PLR signals a bypass tunnel that avoids the next-hop downstream router.

B.

When a failure occurs, the PLR pushs an additional label onto the label stack.

C.

No bypass tunnel is established if the PLR cannot provide node protection.

D.

The head-end router sets the local protection desired flag in the session attribute object.

Which LSAtype is used for OSPF-TE?

A.

Type 8 LSA—Link Local LSA

B.

Type 9 LSA — Link local Opaque LSA

C.

Type 10 LSA — Area local Opaque LSA

D.

Type 11 LSA —AS Opaque LSA

An LSP is configured with one-to-one FRR and node protection on a Alcatel-Lucent 7750 SR. Which of the following is FALSE?

A.

Each PLR signals a protection tunnel that avoids the downstream node.

B.

A single protection tunnel can protect all LSPs that go through the same hop.

C.

A link protection tunnel is signaled if a node protection tunnel cannot be established.

D.

Protection tunnels used in this LSP are also detour tunnels.

Click on the exhibit.

An LDP tunnel is established on router R1 towards router R6. The link between routers R2 and R4 goes down. What will happen to the MPLS data traffic to router R6 IMMEDIATELY after the link goes down?

A.

MPLS data traffic will be discarded until the IGP finds a new next-hop to router R3.

B.

MPLS data traffic will be discarded unless the LDP tunnel has a standby secondary path.

C.

MPLS data traffic will not be discarded because router R1 received labels from both next-hops, routers R2 and R3.

D.

MPLS data traffic will not be discarded because of fast reroute capability on router R2.

Click on the exhibit. After the Isp-ping command is executed, which of the following best describe the router's action?

A.

MPLS Echo Request packets are sent within the RSVP-TE tunnel that is signaled for "lsp-toR2".

B.

MPLS Echo Request packets are sent within the LDP tunnel that is signaled for Mlsp-toR2".

C.

MPLS Echo Request packets are IP-routed to the destination address of "lsp-toR2".

D.

MPLS Echo Request packets are sent to the destination address of "lsp-toR2" over TCP.

Click on the exhibit.

If the primary path fails, which backup LSP path will the head-end router pick first?

A.

The Standby with the highest next-hop IP.

B.

The first Standby in the list.

C.

The Standby with the longest uptime.

D.

The Standby with the lowest next-hop IP.

Click on the exhibit.

When router R1 forwards a PATH message to router R2, which of the following about the PATH message's IP header is TRUE?

A.

The options field is set to router alert.

B.

The source address is R1's egress interface address.

C.

The destination address is R2's ingress interface address.

D.

The HOP object includes R2's system address.

An LSP is configured with a fully loose path and CSPF is not enabled. An LSR receives the first PATH message for this LSP. Which of the following is NOT performed by the LSR?

A.

The LSR regenerates and forwards a new PATH message.

B.

The LSR stores the PATH message in the PSB.

C.

The LSR forwards the PATH message based on the HOP object in the RSB.

D.

The LSR looks up the PATH message's destination IP address in the FIB.

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