Nokia Optical Networking Fundamentals

Here you have the best Nokia 4A0-205 practice exam questions

  • You have 68 total questions across 14 pages (5 per page)
  • These questions were last updated on February 17, 2026
  • This site is not affiliated with or endorsed by Nokia.
Question 1 of 68

What is the definition of OSNR?
Answer

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The suggested answer is C.

The Optical Signal-to-Noise Ratio (OSNR) is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth. This definition accurately identifies OSNR as a measure of the quality of an optical signal by comparing its strength to the noise level within a given bandwidth.

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Question 2 of 68

Which of the following are the main reasons for fiber attenuation?
Answer

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The suggested answer is B.

The main reasons for fiber attenuation are scattering and absorption. Scattering occurs when light is scattered in different directions due to microscopic variations in the fiber material, while absorption happens when impurities in the fiber absorb some of the light energy, converting it to heat. Both these factors contribute to the loss of signal strength as light travels through an optical fiber.

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Question 3 of 68

What is the meaning of first, second, and third window in the optical fiber propagation context?
Answer

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The suggested answer is B.

In the context of optical fiber propagation, the first, second, and third windows refer to specific wavelength intervals where optical transmission is most efficient. These windows are typically associated with fiber optic communication and Wavelength Division Multiplexing (WDM) systems, where different wavelength ranges are used to transmit multiple signals simultaneously over a single fiber. The first window is usually around 850 nm, the second window around 1300 nm, and the third window around 1550 nm. These ranges are chosen due to their low attenuation and minimal signal loss properties.

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Question 4 of 68

In which window(s) does the attenuation reach its minimum peak?
Answer

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The suggested answer is C.

The correct answer is the third window (1550 nm). Attenuation in optical fibers is lowest in the third window, around 1550 nm, where the signal loss is minimized, making it ideal for long-distance communication.

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Question 5 of 68

Which of the following statements is true about chromatic dispersion (CD)?
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The suggested answer is C.

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About the Nokia 4A0-205 Certification Exam

About the Exam

The Nokia 4A0-205 (Nokia Optical Networking Fundamentals) validates your knowledge and skills. Passing demonstrates proficiency and can boost your career prospects in the field.

How to Prepare

Work through all 68 practice questions across 14 pages. Focus on understanding the reasoning behind each answer rather than memorizing responses to be ready for any variation on the real exam.

Why Practice Exams?

Practice exams help you familiarize yourself with the question format, manage your time, and reduce anxiety on the test day. Our 4A0-205 questions are regularly updated to reflect the latest exam objectives.