200-301 · Question #273
Using direct sequence spread spectrum, which three 2.4-GHz channels are used to limit collisions?
The correct answer is A. 1, 6, 11. In the 2.4 GHz band, channels 1, 6, and 11 are the three non-overlapping channels that are typically used for Wi-Fi networks to minimize interference and collisions when direct sequence spread spectrum (DSSS) is employed.
Question
Options
- A1, 6, 11
- B1, 5, 10
- C1, 2, 3
- D5, 6, 7
How the community answered
(21 responses)- A95% (20)
- D5% (1)
Why each option
In the 2.4 GHz band, channels 1, 6, and 11 are the three non-overlapping channels that are typically used for Wi-Fi networks to minimize interference and collisions when direct sequence spread spectrum (DSSS) is employed.
Channels 1, 6, and 11 are the only three non-overlapping channels in the 2.4 GHz Wi-Fi spectrum for 20 MHz wide channels, making them ideal for deployments that need to limit co-channel interference and improve performance using DSSS or other modulation schemes.
While channels 1 and 10 might be somewhat separated, channel 5 overlaps with both 1 and 6, leading to interference; these are not non-overlapping.
Channels 1, 2, and 3 heavily overlap with each other, causing significant interference and increasing the likelihood of collisions in the same area.
Channels 5, 6, and 7 heavily overlap with each other, causing significant interference and increasing the likelihood of collisions in the same area.
Concept tested: 2.4 GHz Wi-Fi non-overlapping channels
Source: https://www.cisco.com/c/en/us/td/docs/wireless/access_point/aps_outdoor/700w_series/configuration/guide/700w_series_cg/700w_series_cg-chap3-rf.html
Topics
Community Discussion
No community discussion yet for this question.