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Updated: Sep 09, 2026
No. of Questions: 40 Questions & Answers with Testing Engine
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Nokia 4A0-265 Exam Overview:
| Certification Vendor: | Nokia |
|---|---|
| Exam Name: | Nokia Optical Diagnostics and Troubleshooting |
| Exam Number: | 4A0-265 |
| Related Certifications: | Nokia Advanced Optical Network Design Expert Nokia Certified Optical Network Architect |
| Exam Duration: | 90 minutes |
| Available Languages: | English |
| Real Exam Qty: | 40 |
| Exam Format: | Scenario-based, Multiple Choice |
| Certificate Validity Period: | 3 years |
| Exam Price: | 125 USD |
| Passing Score: | 70% |
| Recommended Training: | Optical Diagnostics and Troubleshooting (TOP00007) |
| Exam Registration: | Nokia Exam Registration |
| Sample Questions: | Nokia 4A0-265 Sample Questions |
| Exam Way: | Online proctored or onsite at authorized test centers |
| Pre Condition: | No mandatory prerequisites; recommended knowledge of optical networking principles and Nokia 1830 PSS systems |
| Official Syllabus URL: | https://www.nokia.com/networks/training/onc/exams/optical-diagnostics-troubleshooting/ |
Nokia 4A0-265 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Troubleshooting Methodologies | 30% | - Alarm and condition interpretation
|
| Topic 2: Optical Diagnostics and Monitoring Tools | 25% | - Nokia management interfaces
|
| Topic 3: Transponder and System Fault Resolution | 20% | - Service restoration
|
| Topic 4: Optical Network Architecture and Signal Flow | 25% | - Amplifier configurations
|
Nokia Optical Diagnostics and Troubleshooting Sample Questions:
Question 1
Which of the following statements best describes the Forward Error Correction (FEC) technique?
A. FEC enables errors to be detected and corrected without retransmission. This technique is effective only above a specified OSNR threshold.
B. FEC enables errors to be detected and data to be retransmitted. This technique is effective only above a specified OSNR threshold.
C. FEC enables errors to be detected and corrected without retransmission. This technique is effective only below a specified OSNR threshold.
D. FEC enables errors to be detected and data to be retransmitted. This technique is effective only below a specified OSNR threshold.
Question 2
Suppose a Raman amplifier has been plugged into slot 1/8. Which command should the user enter to retrieve the total optical power detected at the ingress interface?
A. show interface 1/8 power
B. show interface 1/8 opin
C. show Interface 1/8/LINEIN
D. show interface 1/8/UNEIN detail
Question 3
Which of the following commands is used to retrieve the total output power level?
A. show interface am2125a 1/6/lineout detail
B. show interface am2125a 1/6/lineout
C. show interface am2125a 1/6/lineout wavekey
D. show interface am212 5a 1/6/lineout pm
Question 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 (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.
B. A list of all channels on this interface for which any Wave Keys pair is being received.
C. A list of all channels detected against the selected interface, including Wave Keys pair, channel status, expected and measured power, allowed deviation, and tolerance.
D. A list of the unexpected channels detected against the selected interface.
Solutions:
| Question 1 Answer: A | Question 2 Answer: D | Question 3 Answer: A | Question 4 Answer: A |
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