Nokia Segment Routing Practice Questions & Answers • ExamPrepare

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Question 1

Consider the exhibit. Which of the following statements about fast re-route for flex-algo instance 129 is TRUE?

Only standard LFA is enabled on router R1; fast re-route is not enabled on router R2.
Only standard LFA is enabled on both routers R1 and R2.
Standard LFA and remote-LFA are enabled on router R1; fast re-route is not enabled on router R2.
Standard LFA and remote-LFA are enabled on router R1; standard LFA and TI-LFA are enabled on router R2.

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Question 2

Consider the exhibit. Based on the configuration shown for routers R1 and R10, what valid flex-algo definitions exist in the network?

No valid flex-algo definitions, because of the conflicting parameters.
One valid flex-algo definition, using delay as the link metric and including green links.
One valid flex-algo definition, using te-metric as the link metric and including blue links.
Two valid flex-algo definitions, one uses te-metric as the link metric and includes blue links and the other uses delay as the link metric and includes green links.

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Question 3

In which of the following aspects does the configuration of flex-algo LSPs NOT have an advantage over the configuration of SR-TE LSPs?

List of link-metric types available to choose from
Label stack size of the encapsulated data packets
List of traffic-engineering constraint types available to choose from
Whether it is necessary to configure each LSP explicitly and specify its own set of traffic-engineering constraints

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Question 4

Consider the exhibit. 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 D-LFA selects such a router?

It selects an immediate neighbor.
It selects a remote router, reachable through a tunnel defined by a single Node-SID.
It selects a remote router, reachable through a tunnel defined by a Node-SID and one or two Adjacency-SIDs.
It 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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Question 5

The exhibit presents packets being transmitted inside an LSP’s multi-segment primary path going from router R1 to router R8. The LSP also has a standby secondary path, and Seamless-BFD has been enabled on the primary path. The link between routers R1 and R2 fails, and fast re-route (FRR) is triggered. As a result, router R1 forwards the packets to router R3 and adds the proper FRR encapsulation to reach which router?

To reach router R2, which is the LSP’s intended next-hop.
To reach router R5, which is the shortest way to go back to the original path.
To reach router R4, which is the tail-end of the active segment.
To reach router R8, which is the tail-end of the LSP.

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Question 6

Which of the following statements about segment routing fast re-route is FALSE?

Fast re-route typically protects the active segment of a tunnel, but under certain conditions it can protect an end-to-end multi-segment tunnel instead.
The D-LFA method fails when there are no routers in the intersection of the Extended P-Space and the Q-Space.
R-LFA adds fewer SIDs to the data packet label stack than D-LFA.
The parameter “max-sr-frr-labels” limits the number of labels that TI-LFA can add to the data packet encapsulation.

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