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Nokia 4A0-116 Exam Syllabus Topics:

Topic	Details
Topic 1	Precedence of the different LFA options Enabling segment routing fast re-route Path Computation Element Protocol (PCEP)
Topic 2	Configuring segment routing LSPs calculated by the PCE SR-TE with a path computation element
Topic 3	Configuring segment routing LSPs with traffic engineering constraints Configuring IS-IS to advertise TE information
Topic 4	Link-state routing protocol extensions to support traffic engineering Configuring OSPF to advertise TE information
Topic 5	Topology-Independent Loop-Free Alternate (TI-LFA) paths Remote Loop-Free Alternate (R-LFA) paths
Topic 6	Link-state routing protocol extensions to support segment routing Configuring OSPF to support segment routing
Topic 7	Using segment routing tunnels with TE constraints (SR-TE) Label stack reduction for CSPF-calculated paths
Topic 8	Local calculation of a TE-constrained LSP path Secondary LSP paths and seamless-BFD Ensuring LSP path diversity
Topic 9	Using segment routing tunnels that follow the IGP shortest path Basic segment routing configuration and operation
Topic 10	Advertisement of flex-algo information by OSPF Flexible algorithm configuration Flexible algorithm basics
Topic 11	Differences between segment routing and other traditional MPLS label signaling protocols MPLS data encapsulation and forwarding
Topic 12	Steering traffic into flex-algo segment routing tunnels Advertisement of flex-algo information by IS-IS

Nokia Segment Routing Exam Sample Questions (Q26-Q31):

NEW QUESTION # 26
Which of the following statements about path definitions is FALSE?

• A. A loose hop is one that does not have to be directly adjacent to the previous hop in the path list
• B. Once a path is associated with an LSP, it cannot be used by other LSPs.
• C. In addition to the hops defined in the path list, the head-end and tail-end routers are implicitly added.
• D. The path hops can be defined by either the system or physical interface IP address.

Answer: D
NEW QUESTION # 27
Which of the following is not required to be advertised by a router participating in Segment Routing?

• A. Adjacency-SIDs
• B. SRGB when SRv6 is configured
• C. Support for SR-MPLS for IPv4 or IPv6, or SRv6
• D. Local Node-SID

Answer: B Explanation:
SRGB when SRv6 is configured: This is not required to be advertised, SRGB(Segment Routing Global Block) is only used for SR-MPLS and is not needed when SRv6 is configured. Instead, SRv6 uses the IANA-assigned IPv6 address space.
NEW QUESTION # 28
Which of the following statements about the Path Computation Element (PCE) is FALSE?

• A. A stateless PCE can calculate cross-area traffic-engineering-constrained LSP paths.
• B. A stateful PCE can allow LSPs to reserve bandwidth.
• C. The PCE can obtain topology and traffic-engineering information from the network using either a link-state IGP or BGP-LS.
• D. A stateful PCE proactively monitors all the existing LSPs and triggers the necessary repairs and re-optimizations.

Answer: B Explanation:
Stateful PCE can monitor the existing LSPs and trigger necessary repairs and re-optimizations, but it does not have the capability to reserve bandwidth.
NEW QUESTION # 29
To create a flex-algo instance in a network, which of the following configuration steps is mandatory?

• A. Configuring the proper values for the shared-risk link groups (SRLGs) that will define the flex-algo topology.
• B. Configuring at least one router in the network to create and advertise the flex-algo definition.
• C. Configuring LSPs between every pair of PE routers.
• D. Specifying whether the LSP paths will be computed locally or by an external path computation element (PCE).

Answer: B Explanation:
To create a flex-algo instance in a network, it's mandatory to configure at least one router in the network to create and advertise the flex-algo definition, This is the first step in creating a flex-algo instance, and it's done by defining the flex-algo instance and its properties on one or more routers in the network.
The other steps are important to fine-tune the flex-algo instance, but not mandatory to create it.
Configuring the proper values for the shared-risk link groups (SRLGs) that will define the flex-algo topology.
Specifying whether the LSP paths will be computed locally or by an external path computation element (PCE).
Configuring LSPs between every pair of PE routers.
NEW QUESTION # 30
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 selects an immediate neighbor.
• B. 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.
• C. It selects a remote router, reachable through a tunnel defined by a single Node-SID.
• D. It selects a remote router, reachable through a tunnel defined by a Node-SID and one or two Adjacency-SIDs.

Answer: B 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 # 31
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