nokia 4A0-103 Exam Questions
Questions for the 4A0-103 were updated on : Nov 21 ,2025
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Question 1
Click on the exhibit.
An LDP-over-RSVP tunnel is established between PE-1 and PE-2. Which of the following is NOT
required to protect the LDP-over-RSVP tunnel?
- A. PE-1 requires T-LDP sessions to both ABR-1 and ABR-2.
- B. PE-1 requires a full mesh of RSVP-TE LSPs to all routers in area 1.
- C. ABR-1 requires T-LDP sessions to all ABRs in area 0.
- D. PE-1 requires fast reroute enabled on all RSVP-TE LSPs.
Answer:
B
Question 2
Which MPLS label mode saves label mappings received from all peer LSRs?
- A. Conservative label retention
- B. Liberal label retention
- C. Downstream on demand
- D. Downstream unsolicited
Answer:
B
Question 3
Click on the exhibit.
The LSP "toR6" is configured with a fully strict path on an Alcatel-Lucent 7750 SR. Which of the
following configurations is required to enable fast reroute for this LSP?
- A. Enable fast-reroute on all routers along the path. R1, R2, R4, and R6.
- B. Enable both link-protection and node-protection on router R1.
- C. Enable fast-reroute with either one-to-one or facility mode on this LSP.
- D. Enable link-protection only on router R4.
Answer:
C
Question 4
An IS-IS TE enabled router has an interface on a 500Mbps link and it is configured with a 25%
subscription. If this interface is not used by any LSPs. what value will be shown in the Reservable
Bandwidth sub-TLV?
- A. 125 Mbps
- B. 500 Mbps
- C. 625 Mbps
- D. 2000 Mbps
Answer:
A
Question 5
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.
Answer:
C
Question 6
Click on the exhibit.
The partial command output from an Alcatel-Lucent 7750 SR is shown. Which of the following about
this LSP path is TRUE?
- A. R4 (10.10.10.4) has established a link protection tunnel.
- B. R6 (10.10.10.6) has established a link protection tunnel.
- C. R2 (10.10.10.2) has established a node protection tunnel.
- D. R1 (10.10.10.1) has not established a node protection tunnel.
Answer:
A
Question 7
If an LSP needs to use an admin group, which of the following configurations is NOT required on the
Alcatel-Lucent 7750 SR?
- A. Assign an admin group to a MPLS interface.
- B. Configure CSPF on the LSP.
- C. Configure at least one strict hop on the LSP path.
- D. Configure an "include" or "exclude" statement on the LSP path.
Answer:
C
Question 8
Which of the following about RSVP-TE summary refresh messages is TRUE?
- A. They list the RSVP session names that the router is refreshing,
- B. They list the Message IDs that the router is refreshing,
- C. They list the Tunnel IDs that the router is refreshing.
- D. They list the LSP I Ds that the router is refreshing.
Answer:
B
Question 9
Click on the exhibit.
What is the possible reason that the label for prefix 192.10.1.2/32 is not active?
- A. The router does not have a route to reach to the peer 10.10.10.2/32.
- B. The router does not have a route to reach to the prefix 192.10.1.2/32.
- C. The router does not have an export policy defined to export the prefix 192.10.1.2/32 into LDP.
- D. The router receives an invalid label for the prefix 192.10.1.2/32 from its peer.
Answer:
B
Question 10
Which of the following fields does NOT appear in the MPLS label header?
- A. Label
- B. Frame check sequence
- C. Traffic Class (previously called Experimental)
- D. Time To live
- E. Bottom of stack bit
Answer:
B
Question 11
Which of the following is NOT an application of MPLS?
- A. Enabling VPNs
- B. Enabling traffic engineering
- C. Enabling network security
- D. Enhancing network resiliency
Answer:
C
Question 12
Which of the following regarding label population is TRUE?
- A. Selected labels from the FIB are populated to the LFIB.
- B. Selected labels from the RIB are populated to the FIB.
- C. Selected labels from the LIB are populated to the FIB.
- D. Selected labels from the LIB are populated to the LFIB.
Answer:
D
Question 13
Which LSA type 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
Answer:
C
Question 14
Which of the following about IS-IS Traffic Engineering on an Alcatel-Lucent 7750 SR is FALSE?
- A. Traffic engineering information is carried in the extended TLVs.
- B. Traffic engineering must be enabled on all IP/MPLS routers along the LSP path.
- C. Traffic engineering information is stored in the opaque database,
- D. Traffic engineering is required for constraint-based LSPs.
Answer:
C
Question 15
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.
Answer:
A