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Nokia 4A0-116 Exam Syllabus Topics:

Topic	Details
Topic 1	Configuring segment routing LSPs calculated by the PCE SR-TE with a path computation element
Topic 2	Link-state routing protocol extensions to support traffic engineering Configuring OSPF to advertise TE information
Topic 3	Link-state routing protocol extensions to support segment routing Configuring OSPF to support segment routing
Topic 4	Local calculation of a TE-constrained LSP path Secondary LSP paths and seamless-BFD Ensuring LSP path diversity
Topic 5	Using segment routing tunnels that follow the IGP shortest path Basic segment routing configuration and operation
Topic 6	Differences between segment routing and other traditional MPLS label signaling protocols MPLS data encapsulation and forwarding
Topic 7	Using segment routing tunnels with TE constraints (SR-TE) Label stack reduction for CSPF-calculated paths
Topic 8	Topology-Independent Loop-Free Alternate (TI-LFA) paths Remote Loop-Free Alternate (R-LFA) paths
Topic 9	Steering traffic into flex-algo segment routing tunnels Advertisement of flex-algo information by IS-IS
Topic 10	Precedence of the different LFA options Enabling segment routing fast re-route Path Computation Element Protocol (PCEP)
Topic 11	Segment routing tunnels with traffic engineering constraints Enabling traffic engineering

Nokia Segment Routing Exam Sample Questions (Q25-Q30):

NEW QUESTION # 25
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?

• A. 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.
• B. It selects an immediate neighbor.
• C. It selects a remote router, reachable through a tunnel defined by a Node-SID and one or two Adjacency-SIDs.
• D. It selects a remote router, reachable through a tunnel defined by a single Node-SID.

Answer: A Explanation:
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.
NEW QUESTION # 26
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. The primary path is always preferred over a secondary pa
• C. Up to three paths can be configured for a given SR-TE LS
• D. Preference values can be configured for non-standby secondary paths.

Answer: C Explanation:
Typically, in SR-TE, only two paths can be configured for a given SR-TE LSP: primary path and secondary path. The primary path is used for normal traffic forwarding, and the secondary path is used as a backup in case the primary path fails. Only one LSP path forwards the traffic at any time.
NEW QUESTION # 27
Which of the following types of information is considered by a stateless PCE when it processes a new LSP path calculation request?

• A. The amount of bandwidth reserved for each of the existing LSP paths
• B. The traffic-engineering database
• C. The IGP link-state database
• D. The operational state of existing LSP paths

Answer: C
NEW QUESTION # 28
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, SRLG that each link belongs to, link status up/down.
• B. Administrative groups that each link belongs to, TE metric of links, bandwidth availability of each link, 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.

Answer: B Explanation:
In SR-TE, routers need to advertise certain attributes of their links to other routers in the network in order to calculate traffic-engineered paths. These attributes include:
Administrative groups that each link belongs to: This information is used to restrict the use of certain links to specific traffic types or groups.
TE metric of links: This information is used to calculate the cost of using a particular link for a traffic-engineered path.
Bandwidth availability of each link: This information is used to control the amount of traffic that can be sent over a particular link.
SRLG that each link belongs to: This information is used to avoid routing over the same physical link. Link status up/down is not needed to be advertised as it is part of the IGP protocol and is used to check the reachability of a link.
NEW QUESTION # 29
Which of the following is NOT a valid option to steer traffic into a flex-algo segment-routing tunnel?

• A. Configuring and applying a VRF import policy to a VPRN service and enabling the sr-is-is or sr-ospf tunnel type for the service, depending on the underlying routing protocol.
• B. Specifying the flex-algo instance ID as an additional TE constraint for an SR-TE LSP and enabling the sr-te tunnel type for a VPN service.
• C. Configuring and applying a VSI import policy to an EVPN service and enabling the sr-is-is or sr-ospf tunnel type for the service, depending on the underlying routing protocol.
• D. Using a flex-algo Node-SID as an explicit hop in the path definition of an SR-TE LSP and enabling the sr-te tunnel type for a VPN service.

Answer: C Explanation:
Applying a VSI import policy to an EVPN service and enabling the sr-is-is or sr-ospf tunnel type for the service is not a valid option for steering traffic into a flex-algo segment-routing tunnel, VSI is not related to flex-algo SR.
NEW QUESTION # 30
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