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Difficulty: HardWireless Networking Standards and Technologies

A network technician is troubleshooting severe throughput degradation and frequent frame retransmissions across three neighboring wireless access points deployed in a medical office building. A spectrum analysis reveals that the access points are operating on the 2.4 GHz band and are currently configured on Channel 1, Channel 4, and Channel 8. Which of the following channel reconfigurations should the technician implement to completely eliminate adjacent-channel interference (ACI) while maintaining optimal 2.4 GHz wireless coverage?

  1. Reassign the three access points to non-overlapping Channels 1, 6, and 11.Answer
  2. B
    Reassign the three access points to Channels 2, 6, and 10 to establish equal numeric spacing.
  3. C
    Enable 40 MHz channel bonding on Channel 1 and Channel 6 across all three access points.
  4. D
    Reassign all three access points to Channel 6 and set their transmission power to maximum.

Answer

Reassigning the access points to non-overlapping Channels 1, 6, and 11 is the correct configuration.
In the 2.4 GHz wireless spectrum, individual channels are spaced 5 MHz apart, but a standard 802.11 channel requires 20 MHz of channel width (plus 2 MHz total guard band). Consequently, only Channels 1, 6, and 11 offer complete frequency separation without overlapping each other. Changing the deployment to use Channels 1, 6, and 11 removes adjacent-channel interference entirely.

Step-by-Step Solution

1
Analyze the existing 2.4 GHz channel assignment.
Channels 1, 4, and 8 share overlapping frequency spectrum because each 2.4 GHz channel occupies 22 MHz of bandwidth (20 MHz channel width plus guard bands) with center frequencies spaced only 5 MHz apart.
Channels 4 and 8 partially overlap with Channels 1 and 6, causing destructive adjacent-channel interference (ACI).
2
Identify the standard non-overlapping 2.4 GHz channels for 20 MHz channel width.
Channels 1 (2.412 GHz), 6 (2.437 GHz), and 11 (2.462 GHz) provide at least 25 MHz of center frequency separation.
This separation ensures zero spectral overlap between adjacent coverage cells.
3
Select the configuration that eliminates adjacent-channel interference.
Assigning one access point to Channel 1, the second to Channel 6, and the third to Channel 11 isolates the channels cleanly.
This configuration restores full throughput and eliminates frame corruption caused by ACI.

Key Concept

2.4 GHz Non-Overlapping Channel Selection
Estimated Time:2m 0s
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Topics

Wireless Networking Standards and Technologies

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