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Difficulty: MediumWired and Wireless Network Issues

A network technician is troubleshooting persistent connection drops and poor throughput on a warehouse wireless network operating on the 2.4 GHz frequency band. A site survey reveals that neighboring access points in the facility are currently broadcasting on channels 1, 2, and 4. Which of the following channel configuration changes should the technician make on the primary access point to BEST eliminate channel overlap and resolve the interference?

  1. Reconfigure the access point to operate on channel 11.Answer
  2. B
    Reconfigure the access point to operate on channel 3.
  3. C
    Configure the access point to issue dynamic IP address leases via DNS server forwarding.
  4. D
    Replace the access point with a Layer 2 switch to route traffic between wireless subnets.

Answer

Reconfigure the access point to operate on channel 11.
In 2.4 GHz wireless networking, channels 1, 6, and 11 are the only standard non-overlapping channels. Changing the access point configuration to channel 11 moves the signal far enough away from channels 1, 2, and 4 to completely eliminate adjacent-channel interference.

Step-by-Step Solution

1
Identify the wireless frequency band and existing channel assignments
The network operates on the 2.4 GHz band with nearby access points assigned to channels 1, 2, and 4.
Understanding current spectrum usage is required to select a non-interfering channel.
2
Apply standard 2.4 GHz non-overlapping channel principles
Channels 1, 6, and 11 are the standard non-overlapping channels in the 2.4 GHz spectrum.
Each 2.4 GHz channel is 22 MHz wide and spaced 5 MHz apart, meaning channels must be spaced at least 5 channels apart to avoid overlap.
3
Select the optimal channel to avoid active interference
Channel 11 provides maximum frequency separation from channels 1, 2, and 4.
Operating on channel 11 eliminates adjacent-channel noise, restoring stability and throughput.

Key Concept

2.4 GHz Non-Overlapping Channel Selection
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Topics

Wired and Wireless Network Issues

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