Free Nokia 4A0-255 Exam Practice Questions & Explanations

Last updated on: Aug 25, 2026
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Question 1

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

Answer Options
Correct Answer: C
Question 2

Suppose that for a given number of buffer credits and for an given average FC frame size, the maximum FC link length is 50 km.

If the average FC frame size is doubled, which of the following is correct?

Answer Options
Correct Answer: D
Question 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?

Answer Options
Correct Answer: B
Question 4

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)

Answer Options
Correct Answer: B
Question 5

What does an OPU tributary slot contain, when multiplexing OTN frames?

Answer Options
Correct Answer: C