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Nokia 4A0-116 Exam Syllabus Topics:

Topic 1
  • Configuring segment routing LSPs with traffic engineering constraints
  • Configuring IS-IS to advertise TE information
Topic 2
  • Steering traffic into flex-algo segment routing tunnels
  • Advertisement of flex-algo information by IS-IS
Topic 3
  • Segment routing tunnels with traffic engineering constraints
  • Enabling traffic engineering
Topic 4
  • Using segment routing tunnels with TE constraints (SR-TE)
  • Label stack reduction for CSPF-calculated paths
Topic 5
  • Differences between segment routing and other traditional MPLS label signaling protocols
  • MPLS data encapsulation and forwarding
Topic 6
  • Configuring segment routing LSPs calculated by the PCE
  • SR-TE with a path computation element

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Nokia Segment Routing Exam Sample Questions (Q27-Q32):

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?

  • A. An R-LFA path that would not coincide with the path after IGP re-convergence.
  • B. A D-LFA path that would coincide with the path after IGP re-convergence.
  • C. A D-LFA path that would not coincide with the path after IGP re-convergence.
  • D. A standard LFA path that would not coincide with the path after IGP re-convergence.

Answer: B

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.

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?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: A

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

  • A. No valid flex-algo definitions, because of the conflicting parameters.
  • B. One valid flex-algo definition, using te-metric as the link metric and including blue links.
  • C. 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 met includes green links.
  • D. One valid flex-algo definition, using delay as the link metric and including green links.

Answer: C

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

  • A. The routers in the calculated path can take advantage of ECMP to better distribute the traffic load.
  • B. The number of hops included in the end-to-end path is reduced.
  • C. The path calculation can be delegated to an external path computation element (PCE).
  • D. There is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.

Answer: B

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.

In the context of a network that includes a Path Computation Element (PCE), what is a PCC-initiated LSP?

  • A. An LSP that needs to be explicitly configured on the head-end router.
  • B. An LSP for which the initial path is calculated by the head-end router.
  • C. An LSP for which the path repairs and re-optimizations must be triggered by the head-end router.
  • D. An LSP whose existence and state are reported to the PCE.

Answer: D

A PCC-initiated LSP is an LSP that is established and controlled by the PCC (Path Computation Client) which is typically a head-end router. The PCC sends LSP setup and teardown requests to the PCE and also reports the existence and state of the LSPs to the PCE. The PCE then uses this information to perform path computation and to monitor the state of the LSPs.


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