A network administrator is deploying a 2.4\text{ GHz} wireless network across three adjace… — CompTIA Network+

A network administrator is deploying a $2.4\text{ GHz}$ wireless network across three adjacent zones in an office building. To achieve higher throughput, the administrator originally configured all three access points to use $40\text{ MHz}$ channel bonding. However, client devices in the overlap areas experience frequent packet loss and degraded performance due to adjacent-channel interference. Which configuration change should the administrator implement to resolve the interference while preserving continuous wireless coverage?

Reconfigure all access points to use $20\text{ MHz}$ channel width and assign channels 1, 6, and 11.Answer
B
Maintain $40\text{ MHz}$ channel bonding and reassign the access points to channels 1, 3, and 5.
C
Reconfigure all access points to use $20\text{ MHz}$ channel width and assign channels 2, 6, and 10.
D
Increase the transmission power on all access points while maintaining $40\text{ MHz}$ channel bonding.

Answer

Reconfigure all access points to use

20\text{ MHz}

channel width and assign channels 1, 6, and 11.

In the

2.4\text{ GHz}

Wi-Fi spectrum, there are only three standard non-overlapping channels when using a

20\text{ MHz}

channel width: channels 1, 6, and 11. Enabling

40\text{ MHz}

channel bonding combines two

20\text{ MHz}

channels, which occupies most of the usable spectrum and causes heavy adjacent-channel interference in multi-AP environments. Reconfiguring the access points to a

20\text{ MHz}

channel width and assigning channels 1, 6, and 11 ensures complete frequency isolation between adjacent coverage cells.

Step-by-Step Solution

Analyze the spectral limitations of the

2.4\text{ GHz}

ISM band.

The

2.4\text{ GHz}

band offers approximately

83.5\text{ MHz}

of total spectrum, which supports only three non-overlapping

20\text{ MHz}

channels (channels 1, 6, and 11).

Bonding two

20\text{ MHz}

channels into a

40\text{ MHz}

channel consumes

9

of the

14

available channel slots, making multi-AP deployment without severe interference impossible.

Evaluate the impact of reducing channel width on RF interference.

Decreasing the channel width from

40\text{ MHz}

20\text{ MHz}

reduces the spectral footprint of each access point.

20\text{ MHz}

channel width fits cleanly into the standard non-overlapping channel plan.

Determine the proper non-overlapping channel distribution.

Assign channels 1, 6, and 11 across the three adjacent access points.

This configuration provides discrete frequency separation between neighboring access points, eliminating adjacent-channel interference.

Key Concept

2.4 GHz Channel Bonding Constraints and Non-Overlapping Channel Allocation

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

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