Nokia Certified Network Professional – IP/MPLS Services — Question 30

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

Answer options

• A. Refraction and reflection
• B. Scattering and absorption
• C. Chromatic dispersion (CD) and polarization mode dispersion (PMD)
• D. Small channel spacing

Correct answer: B

Explanation

The correct answer is B, as scattering and absorption are the two main factors that contribute to fiber attenuation. Refraction and reflection (A) relate to light behavior in the fiber but do not cause attenuation. Chromatic dispersion (C) and small channel spacing (D) are related to signal quality and bandwidth but are not direct causes of attenuation.