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Difficulty: MediumWireless Networking Standards and Technologies

A network technician is troubleshooting poor wireless performance and frequent packet retransmissions in an office building. A site survey reveals that three nearby access points operating on the 2.4 GHz band are currently broadcasting on channels 1, 3, and 6. Which channel assignment change should the technician make to completely eliminate adjacent-channel interference among these access points?

  1. Reconfigure the access points to operate on channels 1, 6, and 11.Answer
  2. B
    Reconfigure the access points to operate on channels 2, 7, and 12.
  3. C
    Increase the channel width on all access points to 40 MHz while keeping channels 1, 3, and 6.
  4. D
    Set all three access points to broadcast on channel 3 to unify the wireless signal.

Answer

Reconfigure the access points to operate on channels 1, 6, and 11.
In the 2.4 GHz Wi-Fi spectrum, channels 1, 6, and 11 are the only three non-overlapping 20 MHz channels available in North America. Reconfiguring the three access points to these distinct channels prevents signal overlap and resolves adjacent-channel interference.

Step-by-Step Solution

1
Identify the frequency band and current channel configuration.
The network operates on the 2.4 GHz spectrum with access points set to channels 1, 3, and 6.
Channel 3 overlaps with both channel 1 and channel 6, causing adjacent-channel interference.
2
Determine the non-overlapping channel standard for 2.4 GHz Wi-Fi.
Channels 1, 6, and 11 are separated by 25 MHz (using 20 MHz channel widths), preventing frequency overlap.
Standard 2.4 GHz channels require at least 5 channel numbers of spacing to avoid bleeding into adjacent frequencies.
3
Select the option that configures the access points to channels 1, 6, and 11.
Adjacent-channel interference is eliminated while maximizing coverage.
This configuration adheres to 802.11 wireless deployment best practices.

Key Concept

2.4 GHz Wireless Non-Overlapping Channels
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Topics

Wireless Networking Standards and Technologies

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