Cisco Certified Support Technician (CCST) NetworkingNetwork AccessMedium
A network technician is configuring a new wireless access point (AP) in a dense office environment. To minimize interference and optimize performance, the technician needs to select appropriate 2.4 GHz Wi-Fi channels. Which set of channels should be chosen to ensure they are non-overlapping?
- A1, 6, 11
- B1, 5, 9
- C6, 7, 8
- D1, 2, 3
Show answer & explanationAnswer & explanation
Correct answer: A. 1, 6, 11
In the 2.4 GHz band, channels 1, 6, and 11 are the only three non-overlapping channels. Selecting these channels for nearby APs minimizes co-channel interference and improves overall Wi-Fi performance in a dense environment.
Why the other options are wrong
- B. Channels 1, 5, and 9 still have significant overlap, leading to interference.
- C. Channels 6, 7, and 8 heavily overlap with each other, causing significant interference.
- D. Channels 1, 2, and 3 heavily overlap with each other, causing significant interference.
2.4 GHz Non-overlapping Channels
The 2.4 GHz Wi-Fi band has limited non-overlapping channels, making careful channel selection crucial for avoiding interference in multi-AP deployments.
- In North America, channels 1, 6, and 11 are the standard non-overlapping 2.4 GHz channels.
- Each channel occupies 22 MHz, and they are spaced 5 MHz apart.
- Overlapping channels cause co-channel interference, reducing performance.
Memory trick: One-Six-Eleven: Keep Wireless Heaven!