Nokia 4A0-255 practice materials Questions Answers

Exam Code:
4A0-255
Exam Name:
Nokia Advanced Optical Network Design Exam
Last Update:
Jun 01,2026

40 Questions Answers Verified by Experts!


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Nokia 4A0-255 Questions for Nokia Optical Network Design Expert Certification Exam 2026

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Page: 1 / 8
Total Questions: 40

Questions & Answers PDF

• Question 1

  

  Which of the following statements about an alien wavelength at 10G is correct?

  • It is an optical signal generated by FWM impairment.
  • It has similar optical performance across multiple vendors equipment at 10G.
  • It can be measured by a VAC card.
  • It does not support Wavelength tracker.

  Reveal Answer Answer: B Next Question

• Question 2

  

  Consider the exhibit. The grey sites (Site 1 through Site6) from an existing network, which will be extended by adding Site7 and Site8. Which of the following is NOT a common source of interoperability issues for this network extension?

  • Spectrum grid of the extension
  • Fiber connectors at Site6
  • Cascading in the existing network
  • Regeneration requirements at Site5

  Reveal Answer Answer: B Next Question

• Question 3

  

  Which of the following statements about Bit Error Rate (BER) is correct?

  • BER is the ratio of redundant bits to correct bits.
  • BER is measured at both the transmitted and receiving ends.
  • BER can be measured before after the FEC decoding.
  • BER can be accurately measured in a short period of time , for any rate.

  Reveal Answer Answer: B Next Question

• Question 4

  

  Which if the following statements about Recovery Time Objective (RTO) and Recovery Point Object Point Objective (PRO) is FALSE?

  • RTO/PRO define business continually requirements for data center.
  • RTO/PRO defined the acceptable amount of data (in bits) that can be lost after a failure.
  • Data center mirroring has the most critical level of RTO.RPO among DC applications.
  • Tier data centers have stricter RTO/PRO requirements than Tire .

  Reveal Answer Answer: B Next Question

• Question 5

  

  Which of the following statements about the management plane data Communications Network (DCN) is correct?

  • The management plane DCN uses in-band communication.
  • The management plane DCN can be connected to each NEs via OSS/OBS interface.
  • The management plane DCN can be connected to each NEs directly.
  • The management plane DCN enables direct communication between the NEs.

  Reveal Answer Answer: C Next Question

• Question 6

  

  Which of the following best describes self-phase modulation?

  • It is a type of modulation format exploiting the phase to carry information.
  • It is a phase shift suffered by an optical signal caused by its power intensity.
  • It is s type of impairment that can be compensated using DCMs
  • It is a type of impairment cause by spectrally adjacent channels.

  Reveal Answer Answer: D Next Question

• Question 7

  

  What is guardband required for?

  • To reduce the impact of chromatic dispersion.
  • To properly use the available bandwidth of the fibers.
  • To enable each channel to support a higher modulation format.
  • To reduce non-linear impairments between coherent and non-coherent channels.

  Reveal Answer Answer: D Next Question

• Question 8

  

  Which of the following about the Optical channel Transport Unit (OUT0 in ONT network is correct?

  • OUT refer to the section between two multiplexers passing through one or more amplifiers.
  • OUT refers to the section between two amplifiers.
  • OUT enables the multiplexing of OCH connections.
  • OUT enables FEC processing.

  Reveal Answer Answer: A Next Question

• Question 9

  

  Consider an OTN-based network controlled by GMPLS. Which of the following statements is correct?

  • An OCH LSP can be routed through an ODU LSP.
  • An ODU LSP can be routed through an OCH LSP.
  • An ODU LSP is routed between two photonic layer nodes.
  • The routing of the individual ODU frames is based on their label

  Reveal Answer Answer: D Next Question

• Question 10

  

  Which of the following is recommended to reduce the latency of a 30km long link?

  • DCM-free amplifiers
  • Soft-decision FEC
  • Low-noise amplifiers
  • L1 encryption

  Reveal Answer Answer: C Next Question

Page: 1 / 8
Total Questions: 40

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