Nokia 4A0-265 : Nokia Optical Diagnostics and Troubleshooting

4A0-265 real exams

Exam Code: 4A0-265

Exam Name: Nokia Optical Diagnostics and Troubleshooting

Updated: Jul 22, 2026

Q & A: 40 Questions and Answers

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Nokia 4A0-265 Exam Syllabus Topics:

SectionObjectives
Optical Network Fundamentals- DWDM/OTN basics
  • 1. Wavelength division multiplexing principles
    • 2. Optical transport network architecture overview
      - Optical transmission principles
      • 1. Signal attenuation and dispersion concepts
        • 2. Light propagation and fiber characteristics
          Optical Equipment and System Operation- Nokia optical platform components
          • 1. ROADM and optical amplifiers
            • 2. Transponders and muxponders
              - System configuration and monitoring
              • 1. Network management system usage
                • 2. Provisioning and service activation basics
                  Maintenance and Optimization- Network optimization techniques
                  • 1. Signal quality optimization
                    • 2. Capacity and performance tuning
                      - Preventive maintenance
                      • 1. Degradation detection
                        • 2. Performance trend analysis
                          Network Diagnostics and Troubleshooting- Troubleshooting procedures
                          • 1. Layered fault isolation approach
                            • 2. Root cause analysis techniques
                              - Fault detection methods
                              • 1. Performance monitoring indicators
                                • 2. Alarm interpretation and correlation

                                  Nokia Optical Diagnostics and Troubleshooting Sample Questions:

                                  1. What is the default severity level for a Threshold Crossing Alert (TCA) alarm?

                                  A) Warning
                                  B) Minor
                                  C) Major
                                  D) Critical


                                  2. Refer to the exhibit, which shows a conditions list from the 1830 PSS GUI. (i) What is the total number of alarms reported? (ii) How many service affecting alarms are displayed? (iii) How many conditions are displayed?

                                  A) (i) total number of alarms = 2
                                  (ii) number of service affecting alarms = 2
                                  (Hi) number of conditions = 18
                                  B) (i) total number of alarms = 7
                                  (ii) number of service affecting alarms = 5
                                  (Hi) number of conditions = 7
                                  C) (i) total number of alarms = 4
                                  (ii) number of service affecting alarms = 14
                                  (iii) number of conditions = 2
                                  D) (I) total number of alarms = 5
                                  (ii) number of serviceaffectingalarms = 2
                                  (Hi) number of conditions = 14


                                  3. Which of the following statements about using Nokia product documentation in the troubleshooting process is TRUE?

                                  A) Before investigating a problem it is important to check the User Provisioning Guide (UPG) if a possible issue has already been acknowledged by the Product Unit (PU).
                                  B) The Customer Release Notes (CRNs) document collects documented solved known issues, new issues discovered after the product software has been released.as well as software upgrade procedures and firmware details.
                                  C) Before investigating a problem it is important to check the Engineering and Planning Tool User Guide (EPTUG) if a possible issue has already been acknowledged by the Product Unit (PU).
                                  D) The Customer Release Notes (CRNs) provides instructions to perform the automated provisioning, commissioning, and power balancing functions in a customer network based on the Nokia 1830 PS5 platform.


                                  4. Which of the following statements best describes the output of the CLI command: show wavekey wtmonitor
                                  1/6/LINE summary?

                                  A) A list of all channels detected against the selected interface, including Wave Keys pair, channel status, expected and measured power, allowed deviation, and tolerance.
                                  B) A list of the unexpected channels detected against the selected interface.
                                  C) A list of all channels detected against the selected interface (in and out); it shows if a Wave Keys pair is expected, if a Wave Keys pair is received, and if the received Wave Keys pair is unexpected.
                                  D) A list of all channels on this interface for which any Wave Keys pair is being received.


                                  Solutions:

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

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