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Nokia Optical Network Services Expert 4A0-220

4A0-220

Exam Code: 4A0-220

Exam Name: Nokia GMPLS-Controlled Optical Networks

Updated: Jul 27, 2026

Q&A Number: 40 Q&As

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Nokia 4A0-220 Exam Syllabus Topics:

SectionObjectives
Topic 1: GMPLS Fundamentals- MPLS extensions for optical networks
  • 1. Traffic engineering principles
    • 2. LSP concepts in optical domain
      - GMPLS architecture overview
      • 1. Control plane vs data plane
        • 2. Label switching technologies
          Topic 2: 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
                  Topic 3: Control Plane Protocols- Routing protocols
                  • 1. OSPF-TE extensions
                    • 2. IS-IS traffic engineering
                      - RSVP-TE signaling
                      • 1. Resource reservation
                        • 2. Path setup and teardown
                          Topic 4: Optical Transport Networks- OTN architecture
                          • 1. Mapping and grooming
                            • 2. OTUk/ODUk structure
                              - WDM and DWDM systems
                              • 1. Channel multiplexing
                                • 2. Optical spectrum management

                                  Nokia GMPLS-Controlled Optical Networks Sample Questions:

                                  1. What is the Link Maintenance window?

                                  A) A wizard with commands to set links and nodes to maintenance
                                  B) A wizard for modifying TE-link attributes
                                  C) A centralized alarm manager
                                  D) A centralized view of the TE-link for the operator


                                  2. 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 assign the correct wavelengths depending on the type of traffic
                                  C) To measure the end-to-end latency
                                  D) To pick the next hop during LSP signalling


                                  3. How do you add a 3R resource to the NPA in NFM-T?

                                  A) The 3R is added in the Node panel and automatically added to the NPA
                                  B) The resource is discovered automatically
                                  C) The 3R is added to the NPA through the Constraint Wizard
                                  D) The trail is provisioned with 3R constraints and discovered automatically


                                  4. What is the Commissioning File in GMRE nodes?

                                  A) A control checklist for the operator
                                  B) A file of optical impairment parameters for power balance
                                  C) A file with commissioned GMRE nodes for NPA implementation
                                  D) A file with target values that determine whether a given LSP is possible


                                  Solutions:

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

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