Table of Contents
Question
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?
A. The ability to create cross-area TE-constrained LSP paths
B. The ability to create LSP paths with bandwidth reservation
C. The ability to create LSPs with primary and secondary paths
D. The ability to ensure that some LSP paths are disjoint
Answer
D. The ability to ensure that some LSP paths are disjoint
Explanation
The Path Computation Element (PCE) is a network component that can be used to compute paths for Traffic Engineering (TE)-constrained Label Switched Paths (LSPs) in a Multiprotocol Label Switching (MPLS) network. The PCE can be used to compute paths for LSPs that satisfy specific constraints such as bandwidth, latency, and disjointness.
The advantages of using a PCE for the computation of TE-constrained LSP paths over using Constraint-based Shortest Path First (CSPF) locally on the Provider Edge (PE) router include:
- The ability to create cross-area TE-constrained LSP paths
- The ability to create LSP paths with bandwidth reservation
- The ability to create LSPs with primary and secondary paths
Therefore, the correct answer is D. The ability to ensure that some LSP paths are disjoint.
Reference
- Nokia Segment Routing Exam | Nokia
- Nokia Help
- Segment Routing and PCE User Guide (nokia.com)
- Nokia Service Routing Certification (SRC) exams | Nokia
- Nokia Certified Service Routing Architect (SRA) 2022 Updates | Nokia
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