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| Vendor: | Nokia |
|---|---|
| Exam Code: | 4A0-116 |
| Exam Name: | Nokia Segment Routing |
| Exam Questions: | 40 |
| Last Updated: | February 24, 2026 |
| Related Certifications: | Nokia Service Routing Architect |
| Exam Tags: | Service Routing Professional Level Nokia Network EngineersNokia Network Administrators |
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Which of the following statements about segment routing fast re-route is FALSE?
On a Nokia 7750 SR, R-LFA and TI-LFA cannot be enabled independently; they must be enabled together. The parameter 'max-sr-frr-labels' limits the number of labels that R-LFA can add to the data packet encapsulation.
The exhibit highlights in blue the primary path of a segment going from router S to router D. The exhibit also shows a backup path. The protected link fails and fast re-route is triggered on router S. If the backup path has been calculated using standard LFA, how many SIDs are included in the label stack of the data packet forwarded to router R1?

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?

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 steps is NOT required when configuring IS-IS to support Segment Routing?
Enable interfaces used for Segment Routing under: This step is not required, enabling interfaces used for Segment Routing is not necessary as the IS-IS protocol already takes care of the flooding of the routing information.
Which of the following statements about a Segment Routing SID is FALSE?
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.
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