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Updated: Sep 20, 2026
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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 |
| Certificate Validity Period: | 3 years |
| Exam Price: | 125 USD |
| Exam Format: | Scenario-based, Multiple Choice |
| Available Languages: | English |
| Real Exam Qty: | 40 |
| Passing Score: | 70% |
| Exam Duration: | 90 minutes |
| 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: Optical Network Architecture and Signal Flow | 25% | - Amplifier configurations
|
| Topic 2: Optical Diagnostics and Monitoring Tools | 25% | - Performance Monitoring (PM) data analysis
|
| Topic 3: Troubleshooting Methodologies | 30% | - Common optical impairments
|
| Topic 4: Transponder and System Fault Resolution | 20% | - Service restoration
|
Nokia Optical Diagnostics and Troubleshooting Sample Questions:
Which of the following statements about optical power vs amplification stages is TRUE?
- A. The Optical Supervisory Channel (OSC) is amplified when passing through all amplifier types, except for Raman which is not based on EDFA.
- B. When multiple channels pass through a shared port (for example, an amplifier line interface), the total aggregated power reflects the number of channels currently present.
- C. Ingress amplifiers are always more powerful [than egress amplifiers, to reduce the impact of non-linear effects.
- D. When channels pass through amplifiers, all of them always experience a similar amplification.
Correct Answer: B 🗳️
Explanation: Only visible for PracticeMaterial members. You can sign-up / login (it's free).
Which of the following commands is used to retrieve the total output power level?
- A. show interface am2125a 1/6/lineout
- B. show interface am212 5a 1/6/lineout pm
- C. show interface am2125a 1/6/lineout wavekey
- D. show interface am2125a 1/6/lineout detail
Correct Answer: D 🗳️
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What is the default severity level for a Threshold Crossing Alert (TCA) alarm?
- A. Warning
- B. Major
- C. Critical
- D. Minor
Correct Answer: A 🗳️
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Consider the exhibit. A single directional fiber cut is occurring between two amplifiers in unidirectional configuration with Raman pump.
Multiple services are crossing the affected span.
Which node(s) will report an Incoming Payload LOS" alarm?
- A. Neither Node A nor Node C.
- B. Node C only.
- C. Both Node A and Node C
- D. No node, as a Raman pump is used in Node A.
Correct Answer: C 🗳️
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