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Difficulty: MediumWireless Networking Standards and Technologies

A field technician is configuring a dedicated 2.4 GHz wireless access point for legacy inventory scanners in a warehouse. A site survey reveals that surrounding access points managed by neighboring tenants are actively using Channel 1 and Channel 6. To avoid co-channel and adjacent-channel interference, which channel should the technician assign to the new access point?

  1. Channel 11Answer
  2. B
    Channel 3
  3. C
    Channel 5
  4. D
    Channel 8

Answer

Channel 11 should be assigned to the access point because it is the remaining standard non-overlapping channel in the 2.4 GHz frequency band when channels 1 and 6 are already in use.
In 2.4 GHz Wi-Fi standards, individual 20 MHz channels require 25 MHz of separation to avoid overlapping. Consequently, channels 1, 6, and 11 are designated as the standard non-overlapping channels. Because the surrounding access points are operating on channels 1 and 6, selecting Channel 11 guarantees zero spectral overlap and avoids interference.

Step-by-Step Solution

1
Identify the standard non-overlapping channels in the 2.4 GHz Wi-Fi spectrum.
In North American 2.4 GHz 802.11 deployments, channels 1, 6, and 11 are the three non-overlapping 20 MHz channels.
Each 20 MHz channel spans a 22 MHz channel width spaced 5 MHz apart, requiring a 5-channel separation to prevent spectral overlap.
2
Evaluate the channel usage reported by the site survey.
Neighboring access points are occupying Channel 1 and Channel 6.
Choosing any channel between 1 and 10 will create adjacent-channel interference with at least one active neighboring network.
3
Select the channel that eliminates interference.
Select Channel 11.
Channel 11 operates centered at 2462 MHz, providing full clearance from Channel 1 (2412 MHz) and Channel 6 (2437 MHz).

Key Concept

2.4 GHz Non-Overlapping Channels (1, 6, and 11)
Estimated Time:1m 0s
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Topics

Wireless Networking Standards and Technologies

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