Trusted Nokia 4A0-255 Exam Dumps – Avoid Costly Exam Retakes

Question No: 1

MultipleChoice

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

Options

AThe management plane DCN uses in-band communication.

BThe management plane DCN can be connected to each NEs via OSS/OBS interface.

CThe management plane DCN can be connected to each NEs directly.

DThe management plane DCN enables direct communication between the NEs.

Question No: 2

MultipleChoice

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

Options

ABER is the ratio of redundant bits to correct bits.

BBER is measured at both the transmitted and receiving ends.

CBER can be measured before after the FEC decoding.

DBER can be accurately measured in a short period of time , for any rate.

Question No: 3

MultipleChoice

Which of the following best describes self-phase modulation?

Options

AIt is a type of modulation format exploiting the phase to carry information.

BIt is a phase shift suffered by an optical signal caused by its power intensity.

CIt is s type of impairment that can be compensated using DCMs

DIt is a type of impairment cause by spectrally adjacent channels.

Question No: 4

MultipleChoice

What is precision Time Protocol (PTP) designed for?

Options

APrecise time measurements

BSynchronization of encryption entities

CShortest path discovery

DPacket-based timing distribution

Question No: 5

MultipleChoice

Which of the following statements about power commissioning system is most accurate?

Options

AA system must be either linear or a ring.
A system can stop if there is a through communication in a node.

BA system must be a ring only
A system can stop if there is a through connection in a node.

CA system must be a ring only
A system cannot stop if there is a through connection in a node.

DA system must be either linear or a ring
A system cannot stop if there is a through connection in a node

Free Nokia 4A0-255 Exam Dumps June 2026