Nokia GMPLS-Controlled Optical Networks : 4A0-220

  • Exam Code: 4A0-220
  • Exam Name: Nokia GMPLS-Controlled Optical Networks
  • Updated: Aug 16, 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 Routing and Signaling Protocols25%- OSPF-TE and IS-IS TE extensions
          • 1. Link and resource advertisement
            • 2. Traffic engineering database
              - RSVP-TE for GMPLS
              • 1. Label allocation and signaling
                • 2. Path and Resv messages
                  Topic 3: GMPLS Service Provisioning and Operation20%- Creating and managing optical trails and services
                  • 1. Tunnel and LSP provisioning
                    • 2. Path computation and constraints
                      - Maintenance and monitoring
                      • 1. Performance monitoring
                        • 2. Fault detection and isolation
                          Topic 4: Advanced GMPLS Features10%- GMPLS optimization and scalability
                          - SRLG and path diversity
                          Topic 5: 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

                                  Nokia GMPLS-Controlled Optical Networks Sample Questions:

                                  1. Automation is one of the key features of GMPLS. What is its main benefit?

                                  A) Reducing OPEX
                                  B) Reducing CAPEX
                                  C) Supporting multi-vendor networks
                                  D) Providing resilience against multiple failures


                                  2. Which provisioning steps arecommon in both CP to plain MP networks?

                                  A) Node creation
                                  CPB provisioning process Link association CPB power balance
                                  B) Node creation SRG creation Node synchronization CPB power balance
                                  C) Node creation
                                  CPB provisioning process Node synchronization NPA implementation
                                  D) Node creation
                                  CPB provisioning process Node synchronization CPB power balance


                                  3. Which of the following is not a key feature of GMPLS?

                                  A) Fast protection
                                  B) Resource optimization
                                  C) Self-discovery
                                  D) Restoration


                                  4. What is the purpose of preemption when establishing an LSP?

                                  A) To tear down an existing LSP in order to accommodate higher priority traffic
                                  B) To pick the next hop during LSP signalling
                                  C) To measure the end-to-end latency
                                  D) To assign the correct wavelengths depending on the type of traffic


                                  Solutions:

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

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