Nokia 4A0-255 Practice Questions| TestInsights

Question 1

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

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.

Correct : B

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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 2

Consider two EDFA amplifiers in cascade. Each EDFA has an average input signal power of 10 mW and an average noise power of 1 mW. What is the OSNR of the system at the receiver.

A20 dB

B10 dB

C7 dB

D5 bB

Correct : A

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A20 dB

B10 dB

C7 dB

D5 bB

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?

ASpectrum grid of the extension

BFiber connectors at Site6

CCascading in the existing network

DRegeneration requirements at Site5

Correct : B

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ASpectrum grid of the extension

BFiber connectors at Site6

CCascading in the existing network

DRegeneration requirements at Site5

Question 4

Consider the exhibit. Which of the following NE architectures is represented?

4A0-255 Exam Question 4 Exhibit 1

ATOADm

B(Classic) ROADM

CC-F ROADM

DCDC-F ROADm

Correct : A

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ATOADm

B(Classic) ROADM

CC-F ROADM

DCDC-F ROADm

Question 5

What is precision Time Protocol (PTP) designed for?

APrecise time measurements

BSynchronization of encryption entities

CShortest path discovery

DPacket-based timing distribution

Correct : B

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APrecise time measurements

BSynchronization of encryption entities

CShortest path discovery

DPacket-based timing distribution

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