220-801 · Question #772
Which of the following wireless networking standards operates at the SHORTEST distance?
The correct answer is A. 802.11a. 802.11a operates exclusively at 5 GHz. Higher-frequency radio waves have shorter wavelengths that are more easily absorbed and attenuated by walls, furniture, and other obstacles, resulting in a shorter effective range (approximately 35 meters indoors). 802.11b and 802.11g both…
Question
Which of the following wireless networking standards operates at the SHORTEST distance?
Options
- A802.11a
- B802.11b
- C802.11g
- D802.11n
How the community answered
(28 responses)- A93% (26)
- C4% (1)
- D4% (1)
Explanation
802.11a operates exclusively at 5 GHz. Higher-frequency radio waves have shorter wavelengths that are more easily absorbed and attenuated by walls, furniture, and other obstacles, resulting in a shorter effective range (approximately 35 meters indoors). 802.11b and 802.11g both operate at 2.4 GHz, which has better wall penetration and longer range (~38–140 meters). 802.11n can operate on both 2.4 GHz and 5 GHz and uses MIMO antenna technology, significantly extending its range. The tradeoff for 802.11a's shorter range is less interference, since the 5 GHz band was less congested than the crowded 2.4 GHz band.
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