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Nokia 4A0-205 Exam Practice Questions (P. 2)

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Question #6
How does a Raman pump work in the 1830 specific implementation?
  1. A
    The amplification is done simultaneously for all channels as they enter the board.
  2. B
    As the incoming signal power increase, the gain of the amplifier is reduced.
  3. C
    The pump light travels in the same direction of the signal, amplifying it while it flows in the fiber towards the following node.
  4. D
    The pump light travels in the opposite direction of the signal to be amplified, amplifying it while it arrives from the adjacent node.

Correct Answer:
D

Question #7
WDM allows transmission systems to:
  1. A
    Transport multiple signals transparently, onto several wavelengths, all together over one single fiber
  2. B
    Increase the bit rate of each client signal by spreading it over multiple wavelengths
  3. C
    Share a single signal among multiple fibers doing load balancing, and thus increasing the reliability of the optical transmission
  4. D
    Allocate different signals to different time slots

Correct Answer:
A

Question #8
When monitoring the quality of the received signal in WDM, an open eye indicates:
  1. A
    Low noise
  2. B
    High distortion
  3. C
    High jitter
  4. D
    Presence of high inter-symbolic interference

Correct Answer:
D

Question #9
Which of the following sentence about FlexGrid is false?
  1. A
    FlexGrid allows a more efficient channel spacing.
  2. B
    Channels in FlexGrid systems are allocated with a granularity of 27.5 GHz.
  3. C
    FlexGrid systems use specific sets of boards. Old generation WDM systems need to be upgraded to support FlexGrid.
  4. D
    The FlexGrid is currently standardized by ITU-T.

Correct Answer:
C

Question #10
What is the function of a pre-amplifier in an optical network?
  1. A
    Through the pre-amplifier, the optical signal is amplified at the receiver side after it travels along the fiber from another node.
  2. B
    Through the pre-amplifier, the optical signal is amplified at the transmitter side before it is sent to the line span.
  3. C
    Through the pre-amplifier, the optical signal is amplified both the receiver side and at me transmitter side.
  4. D
    Through the pre-amplifier, the optical signal is amplified within the node internally to recover internal losses due, for instance, to cascaded filters.

Correct Answer:
C

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