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Nokia 4A0-265 Exam Syllabus Topics:

Nokia Optical Diagnostics and Troubleshooting Sample Questions:

1. Which of the following statements about the alarm masking mechanism is TRUE?

A) The alarm masking mechanism makes sure that alarms are always present on the downstream interfaces to facilitate the troubleshooting process.
B) The alarm masking mechanism updates the events' original time stamps when it masks/shows alarms, so that when an alarm is not masked anymore, the user can see the updated date and time associated with the original issue.
C) The alarm masking mechanism always forwards masked alarms to an external Network Management System (NMS) for alarm correlation.
D) The alarm masking mechanism preserves the events' original time stamps, when related alarms gets hidden and then eventually displayed because of the mechanism itself, so that the user can still know the date and time of the original issue.

2. Which of the following statements about optical power vs amplification stages is TRUE?

A) When channels pass through amplifiers, all of them always experience a similar amplification.
B) Ingress amplifiers are always more powerful [than egress amplifiers, to reduce the impact of non-linear effects.
C) The Optical Supervisory Channel (OSC) is amplified when passing through all amplifier types, except for Raman which is not based on EDFA.
D) 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.

3. 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 below 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 data to be retransmitted. This technique is effective only below a specified OSNR threshold.
D) FEC enables errors to be detected and corrected without retransmission. This technique is effective only above a specified OSNR threshold.

4. Which of the following Performance Measurement (PM) type is NOT typically retrieved at an Optical Transponder (OT) line interface?

A) Forward Error Correction - Errors Counted (FEC-EC)
B) Digital Wrapper (DW)
C) Ethernet collision counters
D) Optical Power Received (OPR)

Solutions: