100% Free 4A0-255 Practice Exam Questions and Answers

Stay Ahead with Latest 4A0-255 Optical Network Design Expert Practice Test Questions 2026

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Total 40 Questions | Updated On: Sep 23, 2026

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Question 1

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

A : BER is the ratio of redundant bits to correct bits.

B : BER is measured at both the transmitted and receiving ends.

C : BER can be measured before after the FEC decoding.

D : BER can be accurately measured in a short period of time , for any rate.

Answer: B

Question 2

Which if the following statements about Recovery Time Objective (RTO) and Recovery Point Object Point Objective (PRO) is FALSE?

A : RTO/PRO define business continually requirements for data center.

B : RTO/PRO defined the acceptable amount of data (in bits) that can be lost after a failure.

C : Data center mirroring has the most critical level of RTO.RPO among DC applications.

D : Tier data centers have stricter RTO/PRO requirements than Tire .

Answer: B

Question 3

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

A : OUT refer to the section between two multiplexers passing through one or more amplifiers.

B : OUT refers to the section between two amplifiers.

C : OUT enables the multiplexing of OCH connections.

D : OUT enables FEC processing.

Answer: A

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 :

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B :

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C :

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D :

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Answer: B

Page: 1 / 8

Total 40 Questions | Updated On: Sep 23, 2026

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