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Nokia Optical Diagnostics and Troubleshooting Sample Questions:

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.

2. 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 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 (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 the unexpected channels detected against the selected interface.

3. Which of the following correctly describes how a unidirectional amplification stage works?

A) * Incoming optical signals are boosted by the ingress amplifier.
* Outgoing optical signals are also boosted by the ingress amplifier.
B) * Incoming optical signals pass through the ingress amplifier but are not boosted.
* Outgoing optical signals are boosted by the ingress amplifier.
C) * Incoming optical signals are boosted by the ingress amplifier.
* Outgoing optical signals pass through the ingress amplifier but are not boosted.
D) * Incoming optical signals are boosted by the ingress amplifier.
* Outgoing optical signals do not pass through the ingress amplifier.

4. 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) Both Node A and Node C
B) No node, as a Raman pump is used in Node A.
C) Node C only.
D) Neither Node A nor Node C.

Solutions: