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Nokia GMPLS-Controlled Optical Networks : 4A0-220

4A0-220

Exam Code: 4A0-220

Exam Name: Nokia GMPLS-Controlled Optical Networks

Updated: Aug 30, 2026

Q & A: 40 Questions and Answers

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Nokia 4A0-220 Exam Syllabus Topics:

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

                                  Nokia GMPLS-Controlled Optical Networks Sample Questions:

                                  Question 1

                                  What is Tunnel Property Heritage?

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


                                  Question 2

                                  Which of the following best describes Quality of Service in GMPLS?

                                  A. The possibility to have L0 and L1 switching treated with the same quality level in the same network
                                  B. The ability to switch back to the nominal route after a failure is repaired without impacting existing traffic
                                  C. The amount of information that is possible to store in the Traffic Engineering Database (TED)
                                  D. The ability to set constraints such as latency and priority for different kinds of services


                                  Question 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 setting the WSR parameter
                                  C. Coordination is achieved by comparing the Setup Priorities
                                  D. Coordination is achieved by segregation of color and colorless LSPs


                                  Question 4

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

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


                                  Solutions:

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

                                  4A0-220 Related Exams
                                  4A0-265 - Nokia Optical Diagnostics and Troubleshooting
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