4A0-116: Nokia Segment Routing ExamDemo

By Nokia · Browse Mode
About the Exam

This exam covers segment routing concepts and configuration for Nokia service router networks, including IS-IS and OSPF extensions, traffic-engineering tunnels, SR-TE with path computation, fast reroute, and flex-algo. It is aimed at network engineers preparing for the Nokia Service Routing Architect path and related SRC training. Passing earns credit toward Nokia Service Routing Architect certification.

Exam Topics

  • Introduction to segment routing15–20%
  • Basic segment routing configuration and operation15–20%
  • Segment routing tunnels with traffic engineering constraints20–25%
  • SR-TE with a path computation element10–15%
  • Segment routing fast re-route15–20%
  • Flexible algorithms (flex-algo)10–15%

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Last updated July 20, 2026 at 11:08 PM

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QuestionQ1

Introduction to segment routing

Which of the following statements regarding a Segment Routing SID is false?

  • A A Node-SID is usually associated with a router's system interface.
  • B Adjacency-SID values are taken from the SRGB configured for the routing protocol.
  • C A Prefix-SID can be configured directly as a label value or indirectly as an index.
  • D An Adjacency-SID does not have to be configured.
Explanation

An Adjacency-SID is locally significant and is allocated from local label space, such as an SRLB or dynamic label range, rather than from the SRGB. The SRGB is used for global segments such as Prefix-SIDs and Node-SIDs. Adjacency-SIDs can also be allocated automatically by the IGP.

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QuestionQ2

Introduction to segment routing

Which of these statements concerning Multi-Protocol Label Switching networks is FALSE?

  • A MPLS uses a signaling protocol to exchange labels between routers.
  • B An LSR forwards data based on the MPLS labels.
  • C An LSP is a bi-directional tunnel that uses MPLS labels to forward data.
  • D The data is transparently carried from end to end.
Explanation

An MPLS Label Switched Path (LSP) is a directed path through label switching routers. Bidirectional communication normally uses separate LSPs for each direction, rather than one inherently bi-directional MPLS tunnel. RFC 3031 defines an LSP as a sequence of routers followed by packets in a forwarding equivalence class.

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QuestionQ3

Basic segment routing configuration and operation

Which of the following statements concerning a Segment Routing SID is FALSE?

  • A A local Node-SID can be configured directly as an MPLS label.
  • B A router advertises its local Node-SID as a local SRGB and an index only if it is configured as an index.
  • C All routers do NOT need to have the same SRGB range configured.
  • D A local Node-SID can be configured as an index.
Explanation

A Node-SID can be configured as either an absolute MPLS label or an index. SRGB ranges are local to each router and therefore do not have to match across all routers. A Node-SID advertisement is not limited to cases where the Node-SID was configured as an index; the control plane provides the information needed to map the SID for the receiving router’s local SRGB.

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QuestionQ4

Segment routing tunnels with traffic engineering constraints

Which of the following is not among the primary goals of traffic engineering?

  • A Utilizing redundant links.
  • B Avoiding potential congestion points in the network.
  • C Defining traffic paths based on various constraints.
  • D Using the shortest possible path through the network to the destination.
Explanation

Traffic engineering selects paths according to constraints such as available capacity, congestion avoidance, policy, and resiliency. The selected route may be longer than the shortest path when that better meets those requirements.

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QuestionQ5

Segment routing tunnels with traffic engineering constraints

A router that participates in SR-TE advertises an admin-group membership value of 0x11 for one of its interfaces. Which of the following statements is TRUE?

  • A The interface belongs to admin group RED, configured with a value of 17.
  • B Theinterface belongs to two different admin groups.
  • C Theinterface belongs to three different admin groups.
  • D Theinterface belongs to four different admin groups.
Explanation

Administrative-group membership is encoded as a bitmask. The value 0x11 is binary 0001 0001, containing two set bits; therefore, the interface is a member of two distinct administrative groups. Cisco documents SR-TE affinity/admin-group mappings in terms of positions in an administrative-group bitmask.

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Topics covered
Introduction to segment routingBasic segment routing configuration and operationSegment routing tunnels with traffic engineering constraintsSR-TE with a path computation elementSegment routing fast re-routeFlexible algorithms (flex-algo)
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