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4A0-116 : Nokia Segment Routing 2025 Exam

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Nokia


4A0-116


Nokia Segment Routing


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Question: 532


Which of the following is a limitation of using the local CSPF method in SR-TE?


  1. It only allows for bandwidth constraints based on the local view.

  2. It cannot handle multiple administrative groups.

  3. It requires explicit hop definitions for all paths.

  4. It can only operate within a single domain.


    nation: The local CSPF method in SR-TE is limited because it only considers bandwidth aints based on the local view of the network, which may not reflect the overall network state.


    ion: 533

    of the following statements regarding Segment Routing (SR) and MPLS is TRUE? requires an MPLS data plane to operate efficiently.

    can only be implemented in IPv4 networks.

    relies on traditional LDP signaling for label distribution. requires complex configuration on all routers in the network. an operate without MPLS data plane capabilities.


    er: E


    nation: Segment Routing can operate without MPLS by using IPv6 as its data plane, allowin fied configurations and minimizing the need for traditional signaling protocols like LDP.


    ion: 534

    parameter must be set to allow the use of Traffic Engineering with Segment Routing on a N R?


    enabled

    e-enabled

    It ignores SRLG constraints entirely. Answer: A

Expla constr


Quest


Which


  1. SR

  2. SR

  3. SR

  4. SR

  5. SR c


Answ


Expla g for

simpli


Quest

Which okia

7750 S


  1. te-

  2. sr-t

  3. segment-routing-te

  4. traffic-engineering Answer: B

Explanation: The parameter sr-te-enabled must be configured to enable Traffic Engineering functionalities within the Segment Routing context on the Nokia 7750 SR.


Question: 535

In a scenario where a node experiences a link failure, which of the following features of Segment Routing allows for immediate rerouting without waiting for IGP convergence?


  1. Traffic Engineering (TE)

  2. Segment List

  3. Fast Reroute (FRR)

  4. MPLS-TP


Answer: C


convergence, ensuring minimal disruption.


ion: 536


cket in a segment routing environment is forwarded with a SID of 4000 and an adjacency SI hich SID will be used for the next hop?


00

0

Both will be used simultaneously. packet will be dropped.


er: A


nation: When both a SID and an adjacency SID are present, the adjacency SID (5000) is use xt hop decision, directing the packet to the appropriate next router.


ion: 537


onfiguring segment routing on a router that supports both SR-MPLS and SRv6, which uration directive must be specified to prevent conflicts?


ment-routing dual-mode ment-routing mode sr-v6 ment-routing mode sr-mpls

Explanation: Fast Reroute (FRR) allows for immediate rerouting around the failed link without waiting for IGP


Quest


If a pa D of

5000, w


  1. 50

  2. 400 C.

D. The Answ

Expla d for

the ne


Quest


When c config


  1. seg

  2. seg

  3. seg

  4. segment-routing enable Answer: C

Explanation: Specifying segment-routing mode sr-mpls ensures that the router operates in SR-MPLS mode, preventing conflicts with SRv6 configurations.


Question: 538


In a Segment Routing environment, which protocol is primarily responsible for distributing segment


P GRP IS PF

VP-TE


er: D


nation: OSPF is primarily used in Segment Routing environments to distribute segment ation.


ion: 539

egment Routing environment, which of the following is TRUE regarding the use of MPLS la


ch MPLS label must be manually configured on each router.

ment Routing uses a single label stack for both the data path and segment routing. LS labels in Segment Routing are solely used for Layer 2 switching.

LS labels are only applicable in a non-IPv6 network. er: B

nation: Segment Routing utilizes a single label stack that combines both data forwarding and nt routing, simplifying the overall network operations.

information?


  1. BG

  2. EI

  3. IS-

  4. OS

  5. RS

Answ Expla

inform


Quest

In a S bels?


  1. Ea

  2. Seg

  3. MP

  4. MP

Answ Expla

segme

Question: 540


Which of the following is NOT an advantage of using a PCE for the computation of TE-constrained LSP paths, as compared to using CSPF locally on the PE router?


  1. The ability to create cross-area TE-constrained LSP paths

  2. The ability to create LSP paths with bandwidth reservation

  3. The ability to create LSPs with primary and secondary paths

  4. The ability to ensure that some LSP paths are disjoint


Answer: B

ation:


oes not have the capability to reserve bandwidth. This is a function of a Resource Reservation Protocol (RSVP) bel Distribution Protocol (LDP) and is done locally on the PE.


can have advantages such as:


bility to create cross-area TE-constrained LSP paths bility to create LSPs with primary and secondary paths bility to ensure that some LSP paths are disjoint

used to optimize the path computation by centralizing the path calculation and by taking into account a the network


ion: 541


Examine the exhibit.

Explan PCE d

or a La


PCE


â The a â The a â The a

it can be global

view of


Quest


An LSP is being configured to start at R1and end at R6 using local CSPF. The LSP has the following constraints. Include admin-group GREEN, use the TE metric and hop-limit 3.


What routers will be included in the LSP path?

  1. R1, R2, R4, R6

  2. R1, R5, R6

  3. R1, R3, R5, R6

  4. R1, R6


Answer: C Question: 542

Which of the following statements about the Path Computation Element (PCE) is FALSE?



ateful PCE proactively monitors all the existing LSPs and triggers the necessary repairs and re-optimizat ateless PCE can calculate cross-area traffic-engineering-constrained LSP paths.

ateful PCE can allow LSPs to reserve bandwidth.


er: C


ation:


PCE can monitor the existing LSPs and trigger necessary repairs and re-optimizations, but it does not have ity to reserve bandwidth.


ion: 543


n the exhibit, which of the following statements about fast re-route for flex-algo instance 129 is TRUE


standard LFA is enabled on router R1; fast re-route is not enabled on router R2.

  • The PCE can obtain topology and traffic-engineering information from the network using either a link-state IGP or BGP-L

  • A st ions.

  • A st

  • A st


    • Answ


    Explan


    Stateful the

    capabil


    Quest


    Based o ?


    1. Only

    2. Only standard LFA is enabled on both routers R1 and R2.

    3. Standard LFA and remote-LFA are enabled on router R1; fast re-route is not enabled on router R2.

    4. Standard LFA and remote-LFA are enabled on router R1; standard LFA and TT-LFA are enabled on router R2.


    Answer: C Question: 544

    Which of the following steps is NOT required when configuring IS-IS to support Segment Routing?


    1. MPLS label range reserved for Segment Routing.

    2. Enable interfaces used for Segment Routing under

    3. The flooding scope of Segment Routing information.

    4. The Segment Routing Global Block range.


    Answer: B


    Explanation:


    Enable interfaces used for Segment Routing under: This step is not required, enabling interfaces used for Segment Routing is not necessary as the IS-IS protocol already takes care of the flooding of the routing information.


    ion: 545


    SPF is used to support Segment Routing, the first byte of the link-state ID associated with each of the opaque ndicates the type of information being advertised.

    f the following associations between the first-byte value and its meaning is FALSE? ue 1 - Traffic Engineering

    Value 4 - Router Info

    Value 7 - SRGB Range

    ue 8 - Extended Link Info


    er: D


    ation:


    - Extended Link Info: This statement is not true, value 8 is not used to indicate Extended Link Info. It erent types of information, such as Link-Local/Remote Identifiers (LLS/RLS) Identifiers and Node SID/


    ion: 546


    f the following types of information is considered by a stateless PCE when it processes a new LSP pat tion request?


    GP link-state database raffic-engineering database

    Quest


    When O LSAs i


    Which o


    A. Val B.

    C.

    D. Val


    Answ


    Explan


    Value 8 is used

    for diff Adj-

    SID.


    Quest


    Which o h

    calcula


    1. The I

    2. The t

    3. The operational state of existing LSP paths

    4. The amount of bandwidth reserved for each of the existing LSP paths


    Answer: A Question: 547

    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?

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

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

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

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


    Answer: D


    Explanation:



    ion: 548


    f the following statements about path definitions is FALSE?


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

    ose hop is one that does not have to be directly adjacent to the previous hop in the path list ath hops can be defined by either the system or physical interface IP address.

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


    er: C ion: 549

    f the following statements about Segment Routing is FALSE?


    ath signaling is required to establish an SR tunnel. mediate routers do not maintain any tunnel informal nk-state IGP is required to distribute SID information.

    E-constrained tunnels, each data packet typically carries a single MPLS label to specify the tunnel pat


    er: B


    ation:


    ediate routers do not maintain any tunnel informal: this statement is false, Intermediate routers do mainta nformation, such as the Forwarding Information Base (FIB) to forward the packets according to the pat

    When using Segment Routing with Traffic Engineering (SR-TE) in OSPF, the TE information is advertised using extended-link opaque LSAs. The option "sr-te false" indicates that OSPF will not advertise the TE information in the OSPF database, thus the routers will not be aware of the TE information.


    Quest


    Which o


    1. Once

    2. A lo

    3. The p

    4. In a


    Answ Quest Which o

    1. No p

    2. Inter

    3. A li

    4. For T h.


    Answ


    Explan


    Interm in

    tunnel i h

    specified in the packets.


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