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Difficulty: MediumWireless Networking Standards and Technologies

A field technician is reconfiguring wireless access points at a branch office after users report poor network performance and frequent packet drops. A site survey reveals that three nearby 2.4 GHz access points are configured on channels 1, 6, and 8. Which channel should the technician assign to the third access point to eliminate adjacent-channel interference?

  1. Channel 11Answer
  2. B
    Channel 7
  3. C
    Channel 4
  4. D
    Channel 2

Answer

Channel 11
In the 2.4 GHz Wi-Fi spectrum, channels 1, 6, and 11 are the only three non-overlapping 20 MHz channels in North America. With the first two access points assigned to channels 1 and 6, assigning the third access point to channel 11 eliminates adjacent-channel interference across all three access points.

Step-by-Step Solution

1
Identify the frequency band and channel width specified in the scenario.
The network operates on the 2.4 GHz band using standard 20 MHz wide channels.
The 2.4 GHz spectrum has limited frequency range and requires explicit selection of non-overlapping channels to avoid interference.
2
Determine the standard non-overlapping channel scheme for 2.4 GHz Wi-Fi.
Channels 1, 6, and 11 do not overlap with one another.
Each 20 MHz channel in the 2.4 GHz band spans across 5 channel numbers, so channels must be separated by at least 5 channel numbers (1, 6, 11) to avoid adjacent-channel interference.
3
Compare the existing configuration (channels 1, 6, 8) with the standard scheme.
Channel 8 overlaps with channel 6. Changing channel 8 to channel 11 completes the non-overlapping triad (1, 6, 11).
Reassigning the third access point to channel 11 resolves the adjacent-channel interference problem completely.

Key Concept

2.4 GHz Non-Overlapping Wi-Fi Channels
Estimated Time:1m 0s
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Topics

Wireless Networking Standards and Technologies

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