H12-311_V3.0 · Question #306
Which of the following materials does the WLAN signal have less penetration loss? (Multiple choice)
The correct answer is A. Gypsum board B. Glass window (colorless). Gypsum board (drywall) and plain glass windows allow WLAN signals to pass through with minimal attenuation - typically only 2–5 dB of loss - because they are low-density, non-metallic materials that offer little resistance to 2.4 GHz and 5 GHz radio waves. Concrete walls (C)…
Question
Which of the following materials does the WLAN signal have less penetration loss? (Multiple choice)
Options
- AGypsum board
- BGlass window (colorless)
- CConcrete walls
- Dbrick wall
How the community answered
(21 responses)- A86% (18)
- C10% (2)
- D5% (1)
Explanation
Gypsum board (drywall) and plain glass windows allow WLAN signals to pass through with minimal attenuation - typically only 2–5 dB of loss - because they are low-density, non-metallic materials that offer little resistance to 2.4 GHz and 5 GHz radio waves.
Concrete walls (C) and brick walls (D) are incorrect because both are dense, thick, and often contain mineral compounds or rebar that absorb and scatter radio frequency energy heavily, causing 10–20+ dB of signal loss - enough to significantly degrade or block a Wi-Fi connection.
Memory tip: Think "light = low loss." Materials you can easily scratch or see through (drywall, clear glass) let signals through easily, while heavy construction materials (concrete, brick) that take effort to break are just as tough on Wi-Fi signals.
Topics
Community Discussion
No community discussion yet for this question.