200-301 · Question #672
Which set of 2.4 GHz nonoverlapping wireless channels is standard in the United States?
The correct answer is D. channels 1, 6, and 11. In the 2.4 GHz band in the United States, channels 1, 6, and 11 are the three standard non-overlapping channels that can be used simultaneously without interference.
Question
Which set of 2.4 GHz nonoverlapping wireless channels is standard in the United States?
Options
- Achannels 2, 7, 9, and 11
- Bchannels 1, 6, 11, and 14
- Cchannels 2, 7, and 11
- Dchannels 1, 6, and 11
How the community answered
(32 responses)- A3% (1)
- B3% (1)
- C6% (2)
- D88% (28)
Why each option
In the 2.4 GHz band in the United States, channels 1, 6, and 11 are the three standard non-overlapping channels that can be used simultaneously without interference.
Channels 2, 7, and 9 would all overlap with each other, causing significant interference.
Channel 14 is not allowed for Wi-Fi use in the United States, making the inclusion of it incorrect.
Channels 2 and 7 overlap with channel 6 and each other to some extent; channel 11 is non-overlapping, but the set as a whole is not non-overlapping.
The 2.4 GHz band channels are 22 MHz wide and overlap significantly. Channels 1, 6, and 11 are specifically spaced to be completely non-overlapping, allowing them to be used concurrently by multiple access points in the same area without causing co-channel interference.
Concept tested: 2.4 GHz Wi-Fi non-overlapping channels
Source: https://www.cisco.com/c/en/us/support/docs/wireless/aironet-80211abg-b-g-wireless-lan/70487-channels.html
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