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

  • Exam Code: 4A0-220
  • Exam Name: Nokia GMPLS-Controlled Optical Networks
  • Updated: Aug 10, 2026
  • Q & A: 40 Questions and Answers

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Nokia 4A0-220 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: GMPLS Fundamentals and Architecture20%- GMPLS LSP types and characteristics
  • 1. L0, L1, and MRN LSPs
    • 2. LSP attributes and metrics
      - GMPLS control plane overview
      • 1. GMRE and NFM-T integration
        • 2. Layers and components
          Topic 2: GMPLS Service Provisioning and Operation20%- Maintenance and monitoring
          • 1. Performance monitoring
            • 2. Fault detection and isolation
              - Creating and managing optical trails and services
              • 1. Tunnel and LSP provisioning
                • 2. Path computation and constraints
                  Topic 3: Advanced GMPLS Features10%- SRLG and path diversity
                  - GMPLS optimization and scalability
                  Topic 4: GMPLS Protection and Restoration25%- Restoration across layers
                  • 1. Multilayer survivability
                    • 2. Restoration priority and coordination
                      - Protection mechanisms
                      • 1. 1+1, 1:1, shared protection
                        • 2. PRC and SBR
                          Topic 5: GMPLS Routing and Signaling Protocols25%- RSVP-TE for GMPLS
                          • 1. Path and Resv messages
                            • 2. Label allocation and signaling
                              - OSPF-TE and IS-IS TE extensions
                              • 1. Link and resource advertisement
                                • 2. Traffic engineering database

                                  Nokia GMPLS-Controlled Optical Networks Sample Questions:

                                  1. How do you configure the Trail template in NFM-T for an Uplink board (such as 2UC400) in a network with only LI restoration capability?

                                  A) Uncheck the Logical Link box Set the Port Type to Terminated Check the ASON Routed box Check the ASON Tunnel box
                                  B) Check the Logical Link box
                                  Set the Port Type to Unterminated Check the ASON Routed box Check the ASON Tunnel box
                                  C) Check the Logical Link box
                                  Set the Port Type to Unterminated Uncheck the ASON Routed box Uncheck the ASON Tunnel box
                                  D) Uncheck the Logical Link box NSet the Port Type to Terminated
                                  Uncheck the ASON Routed box Uncheck the ASON Tunnel box


                                  2. Which label is swapped in an MPLS label stack at an intermediate node?

                                  A) The label with the highest value
                                  B) The label on the top
                                  C) The label on the bottom
                                  D) The label with the lowest value


                                  3. How are L0 and L1 resources coordinated in case of a failure in an MRN?

                                  A) Coordination is achieved by setting the color constraints
                                  B) Coordination is achieved by segregation of color and colorless LSPs
                                  C) Coordination is achieved by setting the WSR parameter
                                  D) Coordination is achieved by comparing the Setup Priorities


                                  4. What is Tunnel Property Heritage?

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


                                  Solutions:

                                  Question # 1
                                  Answer: C
                                  Question # 2
                                  Answer: B
                                  Question # 3
                                  Answer: A
                                  Question # 4
                                  Answer: C

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