CWNA: Certified Wireless Network Administrator v108 — Question 31

In a long-distance RF link, what statement about Fade Margin is true?

Answer options

• A. A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.
• B. The Fade Margin is a measurement of signal loss through free space and is a function of frequency and distance.
• C. Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.
• D. The Fade Margin of a long-distance radio link should be equivalent to the receiver's low noise filter gain.

Correct answer: C

Explanation

The correct answer is C because Fade Margin indeed refers to an extra buffer of signal strength designed to counteract the effects of fading. Option A is incorrect as Fade Margin is always important regardless of obstructions. Option B is misleading since Fade Margin specifically addresses fading rather than just free space loss. Option D is incorrect because Fade Margin is not defined by the receiver's low noise filter gain.