Most Recent Nokia 4A0-116 Exam Dumps

Prepare for the Nokia Segment Routing exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.

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The questions for 4A0-116 were last updated on Mar 30, 2025.

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Question No. 1

For any of the LFA methods to work properly, there must be a router in the backup path that will forward traffic addressed to the destination without sending it back to the source. Which of the following statements describes the way R-LFA selects such a router?

AIt selects an immediate neighbor.

BIt selects a remote router, reachable through a tunnel defined by a single Node-SID.

CIt selects a remote router, reachable through a tunnel defined by a Node-SID and one or two Adjacency-SIDs.

DIt can select an immediate neighbor or a remote router, as long as the backup path coincides with the path that will become active after IGP reconvergence.

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Correct Answer: D

R-LFA (Remote Loop-Free Alternate) is a method that can select either an immediate neighbor or a remote router to be used as a backup next hop, as long as the backup path coincides with the path that will become active after IGP reconvergence.

Question No. 2

Which of the following is an advantage of enabling label stack reduction for a CSPF-calculated path, as compared to using plain CSPF?

AThe number of hops included in the end-to-end path is reduced.

BThe path calculation can be delegated to an external path computation element (PCE).

CThere is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.

DThe routers in the calculated path can take advantage of ECMP to better distribute the traffic load.

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Correct Answer: A

Once a path is associated with an LSP, it cannot be used by other LSPs is False. A path can be used by multiple LSPs, but each LSP can have different attributes like bandwidth, priority and other constraints.

Question No. 3

The exhibit shows the fast re-route configuration on router R1, in which both R-LFA and TI-LFA have been enabled. Assume that there are multiple potential backup paths for a given prefix. Which of the following options will router R1 use?

AA standard LFA path that would not coincide with the path after IGP re-convergence.

BAn R-LFA path that would not coincide with the path after IGP re-convergence.

CA D-LFA path that would not coincide with the path after IGP re-convergence.

DA D-LFA path that would coincide with the path after IGP re-convergence.

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Correct Answer: D

The exhibit shows that both R-LFA and TI-LFA have been enabled on router R1. R-LFA (Remote Loop-Free Alternate) is a method that is used to protect the active segment of a tunnel, and it allows the router to find a backup path that coincides with the path that will become active after IGP reconvergence. TI-LFA (Topology Independent LFA) is a method that is used to protect an end-to-end multi-segment tunnel, it allows the router to find a backup path that does not rely on the IGP topology, but on the segment routing topology.

With R-LFA and TI-LFA enabled, router R1 will use a D-LFA (Dual-Loop-Free Alternate) path, which is a combination of both R-LFA and TI-LFA, this path will coincide with the path after IGP re-convergence.

A standard LFA, R-LFA, and D-LFA which do not coincide with the path after IGP re-convergence are not the options.

Question No. 4

Which of the following statements about a Segment Routing SID is FALSE?

AA Node-SID is usually associated with a router's system interface.

BAdjacency-SID values are taken from the SRGB configured for the routing protocol.

CA Prefix-SID can be configured directly as a label value or indirectly as an index.

DAn Adjacency-SID does not have to be configured.

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Correct Answer: D

An Adjacency-SID does not have to be configured: this statement is not true, An Adjacency-SID is associated with a neighbor router, it is used to identify an adjacency between two routers. An Adjacency-SID must be configured to identify the adjacency.

Question No. 5

Based upon the exhibit, which of the following statements regarding the configuration is FALSE?

ATraffic engineering information will only be advertised for the interfaces that have both MPLS and RSVP enabled.

BThe Node-SID assigned to this router is the second label in the defined range.

CTraffic engineering has been enabled on this router.

DAdjacency-SID labels will not be advertised as they have not been defined under the physical interfaces.

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Correct Answer: A

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