Free Nokia 4A0-255 Practice Exam with Questions & Answers

Name: How to Pass 4A0-255 Exams
Brand: Examstrack
SKU: 4a0-255
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Questions 1

Consider the exhibit. Which type of survivability mechanism is selected for this trail?

4A0-255 Question 1

Options:

Source-based restoration.

Guaranteed restoration

Optical sub-network connection protection

Protection and restoration combined

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Questions 2

Consider the exhibit, where the two highest ports are OT line ports. Which of the following statements is correct?

4A0-255 Question 2

Options:

The OCH protection is implemented.

The O-SNCP protection is implemented.

The E-SNCP protection is implemented.

An OPS is required upstream (left of the OT).

Questions 3

What isguardband required for?

Options:

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.

Questions 4

Which of the following statements about the recovery time for protection and restoration combined (PRC) is correct?

Options:

PRC can be as fact as sub-network connection protection (SNCP)

PRC is as fast as restoration mechanisms.

PRC has a recovery time that depends on the broken links.

PRC has a typical recovery time greater than 50 ms.

Questions 5

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.

Options:

20 dB

10 dB

7 dB

5 bB

Questions 6

Which of the following is NOTan advantage of super-channels?

Options:

Improved spectral efficiency

Simplified management of the carriers

Narrower spacing between carries of the super-channel

Impairment-free transmission

Questions 7

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

Options:

OUT refer to the section between two multiplexers passing through one or moreamplifiers.

OUT refers to the section between two amplifiers.

OUT enables the multiplexing of OCH connections.

OUT enables FEC processing.

Questions 8

Refer to the exhibit that shows a demand matrix, a network topology with candidate links (in thick bluelinesand dashed lines), the definednetwork in thick blue lines and the demand routing (colored numbers in the figure). Every link is 80 km long. Which of the following requirements is supported by this network design with the displayed demand routing?

4A0-255 Question 8