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Difficulty: MediumWireless Networking Standards and Technologies

A field technician is troubleshooting severe wireless performance degradation in a small office building. The facility uses three access points operating exclusively in the 2.4 GHz spectrum. A wireless survey reveals high packet retries caused by adjacent-channel overlap because the access points are currently set to channels 1, 3, and 6. Which channel assignment should the technician configure on the three access points to completely eliminate channel overlap?

  1. Channels 1, 6, and 11Answer
  2. B
    Channels 2, 4, and 6
  3. C
    Channels 1, 5, and 9
  4. D
    Channels 3, 6, and 9

Answer

Channels 1, 6, and 11 should be configured across the three access points.
Configuring the access points to channels 1, 6, and 11 provides the necessary 25 MHz separation between channel center frequencies, ensuring zero spectral overlap and eliminating adjacent-channel interference in the 2.4 GHz band.

Step-by-Step Solution

1
Identify the frequency band and channel width constraints.
The network operates in the 2.4 GHz band with standard 20 MHz channel spacing.
Each 2.4 GHz channel is spaced 5 MHz apart but requires 20 MHz of bandwidth to operate without overlapping neighbouring frequencies.
2
Determine the non-overlapping channel combination for the 2.4 GHz band.
Channels 1, 6, and 11 provide 25 MHz separation between center frequencies, eliminating overlap.
Choosing 1, 6, and 11 prevents adjacent-channel interference, which causes severe signal degradation and retransmissions.

Key Concept

2.4 GHz Wireless Non-Overlapping Channel Selection
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Topics

Wireless Networking Standards and Technologies

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