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Nokia 4A0-116 - Nokia Segment Routing Exam

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Total 40 questions

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.

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

B.

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

Which of the following statements about Segment Routing tunnels is FALSE?

A.

A Segment Routing tunnel defined by a Node-SID uses the shortest IGP Path.

B.

A Segment Routing tunnel can be defined by multiple Node-SIDs.

C.

A Segment Routing tunnel can be defined by a combination of Node-SIDs and Adjacency-SIDs.

D.

For a Segment Routing tunnel, an intermediate router will always forward the packet based on the best IGP path.

Which of the following statements about SR-TE administrative constraints is FALSE?

A.

A strict hop must be adjacent to the previous hop in the list.

B.

The TE metric for a link is by default the same as the IGP metric.

C.

Shared-Risk-Link Groups are only taken into account when calculating the secondary path.

D.

The head-end router may calculate a path that takes into account max hop count and bandwidth constraints.

Which of the following statements about primary and secondary SR-TE LSP paths is FALSE?

A.

Only one LSP path forwards the traffic at any time,

B.

Up to three paths can be configured for a given SR-TE LS

C.

The primary path is always preferred over a secondary pa

D.

Preference values can be configured for non-standby secondary paths.

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.

1

B.

2

C.

3

D.

4

Which of the following statements about path definitions is FALSE?

A.

Once a path is associated with an LSP, it cannot be used by other LSPs.

B.

A loose hop is one that does not have to be directly adjacent to the previous hop in the path list

C.

The path hops can be defined by either the system or physical interface IP address.

D.

In addition to the hops defined in the path list, the head-end and tail-end routers are implicitly added.

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?

A.

The head end will periodically try to calculate a new path at a rate defined by the retry timer.

B.

The head end will periodically try to calculate a new path at a rate defined by the resignal timer.

C.

The head end will continue forwarding traffic to the current next-hop indefinitely, which will be discarded at the point of failure.

D.

The head end will continue forwarding traffic to the current next-hop indefinitely, and R2 will redirect the traffic to R3 after IGP reconvergence.

In which of the following aspects does the configuration of flex-algo LSPs have an advantage over the configuration of SR-TE LSPs?

A.

Label stack size of the encapsulated data packets

B.

List of traffic-engineering constraint types available to choose from

C.

Ability to associate one primary and up to two secondary paths to the same LSP

D.

Flexibility of configuring each LSP with its own set of traffic-engineering constraints

Which of the following list of SR-TE attributes has to be advertised among routers?

A.

Administrative groups that each link belongs to, TE metric of links, bandwidth availability of each link, SRLG that each link belongs to.

B.

Administrative groups that each link belongs to, TE metric of links, SRLG that each link belongs to.

C.

Administrative groups that each link belongs to, TE metric of links, bandwidth availability of each link, SRLG that each link belongs to, link status up/down.

D.

Administrative groups that each link belongs to, TE metric of links, SRLG that each link belongs to, link status up/down.

OSPF is being used for segment routing with traffic-engineering (SR-TE). The traffic-engineering option has been set to "sr-te false". Which of the following statements is TRUE?

A.

The TE information will be advertised for all the OSPF links that have MPLS enabled.

B.

The TE information will only be advertised using application-specific sub-TLVs.

C.

The TE information will only be advertised for the OSPF links that have both MPLS and RSVP enabled.

D.

The TE information will only be advertised using extended-link opaque LSAs.