CompTIA A+ Core 1 (220-1201)Hardware and Network TroubleshootingHard
A technician is setting up a new Wi-Fi access point (AP) in a dense office environment. After installation, users report slow speeds and frequent disconnections, despite being close to the AP. The technician suspects interference. Which of the following channels would be the BEST choice for the 2.4 GHz band to minimize interference in a crowded environment?
- AChannel 1
- BChannel 9
- CChannel 6
- DChannel 4
Show answer & explanationAnswer & explanation
Correct answer: C. Channel 6
In the 2.4 GHz band, channels 1, 6, and 11 are the only non-overlapping channels. To minimize interference in a dense environment, it's crucial to use these non-overlapping channels and space them out. Channel 6 is one of the three standard non-overlapping channels.
Why the other options are wrong
- A. Channel 1 is a non-overlapping channel, but if other APs are on 1 or 2, it still might experience interference.
- B. Channel 9 significantly overlaps with channels 6, 7, 8, 10, 11, causing severe interference.
- D. Channel 4 significantly overlaps with channels 1, 2, 3, 5, 6, causing severe interference.
2.4 GHz Non-Overlapping Channels
In the 2.4 GHz Wi-Fi band, channels 1, 6, and 11 are the only three non-overlapping channels. Using these channels, spaced appropriately, helps minimize co-channel interference in dense environments.
- 2.4 GHz has 11-13 channels depending on region
- Each channel is 20 MHz wide
- Channels 1, 6, 11 are 25 MHz apart, preventing overlap
- Using overlapping channels causes signal degradation
Memory trick: One Six Eleven: No Overlap Heaven.