CompTIA Network+ (N10-009)Network ImplementationEasy
A technician is deploying a small office wireless network using the 2.4GHz band with three access points placed to minimize interference. Which set of channels should be used to avoid overlapping frequencies?
- A36, 40, 44
- B4, 8, 12
- C1, 6, 11
- D1, 2, 3
Show answer & explanationAnswer & explanation
Correct answer: C. 1, 6, 11
In the 2.4GHz band, channels 1, 6, and 11 are spaced 5 channels apart and do not overlap, allowing multiple APs to coexist without interference. Channels 36, 40, and 44 belong to the 5GHz band, not 2.4GHz.
Why the other options are wrong
- A. These are 5GHz channels, not valid in the 2.4GHz band.
- B. These channels still overlap due to the 22MHz channel width.
- D. Channels 1-3 overlap significantly, causing interference.
2.4GHz Non-Overlapping Channels
In the 2.4GHz Wi-Fi band, only channels 1, 6, and 11 are spaced far enough apart (in the US) to avoid overlapping with each other.
- 2.4GHz channels are 22MHz wide but spaced only 5MHz apart
- Only 1, 6, 11 avoid overlap in a 3-AP deployment
- 5GHz band has many more non-overlapping channels available
Memory trick: '1-6-11' like a phone number—memorize the trio.