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Exam Code: 4A0-265
Exam Name: Nokia Optical Diagnostics and Troubleshooting
Updated: Sep 05, 2026
Q & A: 40 Questions and Answers
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| Section | Objectives |
|---|---|
| Optical Signal Flow Through a Node | |
| Wavelength Tracker | |
| Transmission and Power Adjustment Troubleshooting Techniques | |
| Alarms, Conditions and Logs | |
| Optical Transponder Configuration Troubleshooting | |
| EPT Report Parameters and Power Commissioning Data | |
| Troubleshooting Fiber Cuts / Line Issues and Alarm Correlation | |
| Performance Monitoring and Loopbacks for Troubleshooting | |
| Documentation and Support Information |
Question 1
Suppose a node is experiencing a little unexpected attenuation over the Optical Supervisory Channel (OSC) transmit direction. Which of the following statements is FALSE?
A. Traffic will pass between the local and adjacent node.
B. A Power adjustments action will fail on the local node.
C. A "Data Link Down" alarm will raise on the adjacent node.
D. No OSC-related alarms will raise on the local node.
Question 2
Consider the exhibit which shows an EPT Power Management Report referring to an ingress amplifier. What is the available output optical power range?
A. -0.6 to 1.72 dB
B. -0.02 to 1.14 dB
C. 0.56 to 1.14 dB
D. 0.56 to 1.72 dB
Question 3
Suppose a network operator needs to configure the 10GbE client interface 1/7/C1 with a GFP-F encapsulation mode. Which command should be used?
A. config interface 1/7/C1 encmode 10client gfp-f
B. config encmode interface 1/7/C1 10client gfp-f
C. config encmode interface 1/7/C1 tenGige gfp-f
D. config interface 1/7/C1 tenGige encmode gfp-f
Question 4
Which of the following statements about optical power vs amplification stages is TRUE?
A. 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.
B. The Optical Supervisory Channel (OSC) is amplified when passing through all amplifier types, except for Raman which is not based on EDFA.
C. When channels pass through amplifiers, all of them always experience a similar amplification.
D. Ingress amplifiers are always more powerful [than egress amplifiers, to reduce the impact of non-linear effects.
Solutions:
| Question 1 Answer: D | Question 2 Answer: A | Question 3 Answer: A | Question 4 Answer: A |
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