Nokia Advanced Optical Network Design - 4A0-255 Exam Questions [2026]

QUESTION NO: 1
Consider the exhibit. Which type of survivability mechanism is selected for this trail?

A. Protection and restoration combined B. Guaranteed restoration C. Source-based restoration. D. Optical sub-network connection protection

Correct Answer: C

QUESTION NO: 2
Consider the exhibit showing the schematic for an NE ina deployed optical network. Thetraffic growth forecast is for the use of 40 channels in 3 years. The customer needs to reduce thespace for the shelf. Among the following, which additional input is NOT necessary to meet these specific requirements?

A. Power supply B. Rack size C. Expected traffic added-dropped at the site D. Mean time to repair for the equipment

Correct Answer: A

QUESTION NO: 3
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)

A. Option A B. Option C C. Option D D. Option B

Correct Answer: D

QUESTION NO: 4
Consider the exhibit, where the two highest ports are OT line ports. Which of the following statements is correct?

A. The OCH protection is implemented. B. An OPS is required upstream (left of the OT). C. The O-SNCP protection is implemented. D. The E-SNCP protection is implemented.

Correct Answer: B