Nokia 4A0-220 : Nokia GMPLS-Controlled Optical Networks

4A0-220 real exams

Exam Code: 4A0-220

Exam Name: Nokia GMPLS-Controlled Optical Networks

Updated: Sep 05, 2026

Q & A: 40 Questions and Answers

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Nokia 4A0-220 Exam Syllabus Topics:

SectionObjectives
Optical Transport Networks- WDM and DWDM systems
  • 1. Channel multiplexing
    • 2. Optical spectrum management
      - OTN architecture
      • 1. OTUk/ODUk structure
        • 2. Mapping and grooming
          GMPLS Fundamentals- GMPLS architecture overview
          • 1. Control plane vs data plane
            • 2. Label switching technologies
              - MPLS extensions for optical networks
              • 1. Traffic engineering principles
                • 2. LSP concepts in optical domain
                  Control Plane Protocols- RSVP-TE signaling
                  • 1. Resource reservation
                    • 2. Path setup and teardown
                      - Routing protocols
                      • 1. IS-IS traffic engineering
                        • 2. OSPF-TE extensions
                          Protection and Restoration- Network resiliency mechanisms
                          • 1. Fast reroute mechanisms
                            • 2. 1+1 protection schemes
                              - Failure recovery strategies
                              • 1. Link/node failure recovery
                                • 2. Traffic restoration techniques

                                  Nokia GMPLS-Controlled Optical Networks Sample Questions:

                                  Question #1

                                  Which of the following statements about the Wait for Server Restoration (WSR) parameter in the MRN is correct?

                                  • A. When WSR is false, the LI services do not wait for the LO restoration and restore through LI switching.
                                  • B. When WSR is false, if the failed optical channel can be restored at LO, the data traffic stays in the tunnel.
                                  • C. When WSR is true, the LO optical channel remains in the link until the failure is fixed.
                                  • D. When WSR is true, the LO channels do not wait for the LI services to restore.
                                  Answer: A

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                                  Question #2

                                  What is Tunnel Property Heritage?

                                  • A. Maximum allowed bandwith is propagated from HO to LO LSPs.
                                  • B. The hierarchy tunnels cannot be nested unless they share the same properties.
                                  • C. A restored tunnel inherits the ODUk flows.
                                  • D. Cost, SRLG, and Color properties are propagated from HO to LO LSPs.
                                  Answer: D

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                                  Question #3

                                  Which of the following best describes the Soft Shutting Down state in the NFM-T?

                                  • A. An administrative maintenance state where services stay up but no new traffic can be routed over the TE-link
                                  • B. An automatic shutdown of a TE-link and all of the LSPs in the TE-link
                                  • C. A transient state where current SNCs are soft-rerouted away from the TE-link
                                  • D. A soft synchronization state where new traffic is not allowed
                                  Answer: A

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                                  Question #4

                                  What category of protocols is used by the ingress router to set up a new LSP?

                                  • A. Signaling protocols
                                  • B. Coloring protocols
                                  • C. Link management protocols
                                  • D. Link aggregation protocols
                                  Answer: A

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