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Difficulty: HardWireless Networking Standards and Technologies

A network technician is deploying a dual-band wireless access point operating simultaneously on the 2.4 GHz and 5 GHz frequency bands to support legacy office devices and modern high-speed laptops. To minimize wireless interference while maintaining broad device compatibility and optimizing performance, which of the following configuration practices should the technician follow? (Select TWO.)

  1. Restrict 2.4 GHz channel selection strictly to non-overlapping channels 1, 6, or 11 using a 20 MHz channel width.Answer
  2. B
    Assign adjacent channels such as 2, 3, and 4 in high-density areas to maximize available frequency assignments.
  3. Configure channel bonding (40 MHz or 80 MHz channel widths) primarily on the 5 GHz band rather than the 2.4 GHz band.Answer
  4. D
    Enable 40 MHz channel bonding on the 2.4 GHz band across channels 1 and 6 to double throughput for legacy clients.

Answer

The technician should restrict 2.4 GHz channel selection strictly to non-overlapping channels 1, 6, or 11 using a 20 MHz channel width, and configure channel bonding (40 MHz or 80 MHz channel widths) primarily on the 5 GHz band rather than the 2.4 GHz band.
Restricting the 2.4 GHz band to non-overlapping channels 1, 6, and 11 prevents adjacent-channel interference. Meanwhile, deploying wider bonded channels (40 MHz or 80 MHz) on the 5 GHz band takes advantage of the significantly larger number of available non-overlapping channels in the 5 GHz spectrum without saturating the 2.4 GHz band.

Step-by-Step Solution

1
Analyze the 2.4 GHz spectrum constraints.
The 2.4 GHz band has only 11 usable channels in North America, with 5 MHz separation. Standard 20 MHz wide signals require 5 channels of separation to avoid overlapping, making 1, 6, and 11 the only non-overlapping combination.
Using any other channels (such as 2, 3, or 4) creates adjacent channel interference, degrading overall network performance.
2
Evaluate channel bonding strategies across frequency bands.
Channel bonding combines multiple 20 MHz channels (e.g., 40 MHz or 80 MHz) to increase bandwidth. Because 2.4 GHz lacks sufficient spectrum, 40 MHz bonding consumes almost the entire band, while 5 GHz has dozens of non-overlapping channels suited for wider bonded channels.
Channel bonding is suitable for the 5 GHz (and 6 GHz) spectrum where abundant non-overlapping channels exist, but should be avoided in the 2.4 GHz band.

Key Concept

2.4 GHz vs 5 GHz channel planning and channel bonding constraints
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Topics

Wireless Networking Standards and Technologies

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