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?

The OSNR is defined as the ratio between the transmitted optical power and the received optical power over 1 km of fiber, including both signal and optical noise.

The OSNR is the ratio between the optical output signal power and the optical input signal power of the device being analyzed.

The OSNR is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth.

The OSNR is defined as the ratio between the optical signal power (including noise) and the optical noise power over a specific spectral bandwidth.

Question 2 of 68

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

Refraction and reflection

Scattering and absorption

Chromatic dispersion (CD) and polarization mode dispersion (PMD)

Small channel spacing

Question 3 of 68

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

These windows correspond to three different minimum and maximum optical power levels used for optical transmission.

These windows are three different wavelength intervals where the WDM optical transmission occurs.

These three windows are three different angles of incidence of the light injected by the laser into the fiber.

Different optical transmission windows correspond to different safety requirements and rules for the related lasers operating with these windows.

Question 4 of 68

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

First window (850 nm)

Second window (1300 nm)

Third window (1550 nm)

Both first and second windows

Question 5 of 68

Which of the following statements is true about chromatic dispersion (CD)?

Different channels have different bandwidth and this causes different CD performances.

The fiber attenuation changes along the fiber, and when the light crosses these differences the CD takes place.

Different wavelengths propagate at different speeds within the same media and therefore different colors travel in the fiber with different speed.

The fiber attenuation introduces inter-channel interference.

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.