Free Nokia 4A0-255 Exam Actual Questions

The questions for 4A0-255 were last updated On Feb 19, 2025

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Question No. 1

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

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Correct Answer: B

Question No. 2

Suppose there is a 40 Gbit/s signal which has a symbol rate of Gbaud/s. Which modulation format is being used?

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Correct Answer: C

Question No. 3

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?

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Correct Answer: B

Question No. 4

Consider the exhibit showing the schematic for an NE in a deployed optical network. The traffic growth forecast is for the use of 40 channels in 3 years. The customer needs to reduce the space for the shelf. Among the following, which additional input is NOT necessary to meet these specific requirements?

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Correct Answer: D

Question No. 5

Consider the exhibit that shows a network with a full mesh fiber structure. Link weights indicate the cost. Future services can be requested between any node pair.

Which of the following topology represents a minimum cost design (minimum overall fiber cost) where link failure survivability is ensured?

A)

B)

C)

D)

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Correct Answer: B