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Nokia 4A0-116 Exam
Nokia Segment Routing (Page 2 )

Updated On: 1-Feb-2026
Page 2 of 9
PDF with 40 Questions

Which of the following statements about Multi-Protocol Label Switching networks is FALSE?

  1. MPLS uses a signaling protocol to exchange labels between routers.
  2. An LSR forwards data based on the MPLS labels.
  3. An LSP is a bi-directional tunnel that uses MPLS labels to forward data.
  4. The data is transparently carried from end to end.

Answer(s): D

Explanation:

The data is transparently carried from end to end: This statement is not true, MPLS does not provide data transparency, which means that the data is not carried unmodified from end to end. MPLS uses labels to forward data, so the original IP packets are encapsulated in new MPLS packets, and the original IP headers are not visible at the egress LSR.



An SR-TE LSP with a path definition that includes router R4 as a loose hop and for which Seamless- BFD has been enabled is following the path shown in the exhibit.
What happens after router R4 fails if the routers along the path follow the default behavior?

  1. The head end will periodically try to calculate a new path at a rate defined by the retry timer.
  2. The head end will periodically try to calculate a new path at a rate defined by the resignal timer.
  3. The head end will continue forwarding traffic to the current next-hop indefinitely, which will be discarded at the point of failure.
  4. The head end will continue forwarding traffic to the current next-hop indefinitely, and R2 will redirect the traffic to R3 after IGP reconvergence.

Answer(s): C

Explanation:

When an SR-TE LSP with Seamless-BFD enabled, the BFD sessions are established between the routers along the path to detect any failures quickly. If a failure happens in the path, the router will stop forwarding the traffic and send a BFD control packet to the head-end router. In this case, R4 failed, BFD sessions will detect the failure and send a message to the head-end router, but since R4 is a loose hop, the path doesn't have to be re-calculate. The head-end router will continue forwarding traffic to the current next-hop, R2, which will be discarded at the point of failure (R4) as it doesn't know about the failure. And the traffic will not be redirected to R3 after IGP reconvergence.



Which of the following statements about the Path Computation Element (PCE) is FALSE?

  1. The PCE can obtain topology and traffic-engineering information from the network using either a link-state IGP or BGP-LS.
  2. A stateful PCE proactively monitors all the existing LSPs and triggers the necessary repairs and re- optimizations.
  3. A stateless PCE can calculate cross-area traffic-engineering-constrained LSP paths.
  4. A stateful PCE can allow LSPs to reserve bandwidth.

Answer(s): D

Explanation:

Stateful PCE can monitor the existing LSPs and trigger necessary repairs and re-optimizations, but it does not have the capability to reserve bandwidth.



Based on the exhibit, which of the following is a viable option for the Path Computation Element (PCE) to obtain all the necessary topology and traffic-engineering information from the network, so that it can calculate LSP paths on behalf of the PE routers?

  1. Establishing an IGP adjacency with router R2
  2. Establishing IGP adjacencies with routers R1 and R2
  3. Establishing a BGP session using the BGP-LS address family with router R3
  4. Establishing BGP sessions using the BGP-LS address family with routers R3 and R4

Answer(s): D



Which of the following types of information is considered by a stateless PCE when it processes a new LSP path calculation request?

  1. The IGP link-state database
  2. The traffic-engineering database
  3. The operational state of existing LSP paths
  4. The amount of bandwidth reserved for each of the existing LSP paths

Answer(s): A



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