4A0-116: Nokia Segment Routing ExamDemo

By Nokia · Question Mode

QuestionQ16

SR-TE with a path computation element

Based on the exhibit, which option allows the Path Computation Element (PCE) to obtain all required topology and traffic-engineering information from the network so that it can calculate LSP paths on behalf of the PE routers?

Question Image

  • A Establishing an IGP adjacency with router R2
  • B Establishing IGP adjacencies with routers R1 and R2
  • C Establishing a BGP session using the BGP-LS address family with router R3
  • D Establishing BGP sessions using the BGP-LS address family with routers R3 and R4
Explanation

BGP Link-State (BGP-LS) distributes IGP link-state and traffic-engineering information to external applications such as a PCE. Because the topology contains two distinct IGP areas, the PCE needs BGP-LS information from a router in each area: R3 for IGP Area 1 and R4 for IGP Area 2. This provides the complete topology and TE view required for end-to-end LSP path computation.

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