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Difficulty: MediumWireless Principles and Architecture

A network engineer is troubleshooting severe wireless performance degradation in an enterprise cafeteria. Spectrum analysis reveals significant non-802.11 radio frequency (RF) interference originating from operating microwave ovens and legacy Bluetooth IoT sensors. Which modification to the wireless infrastructure will best mitigate this specific source of RF interference?

  1. Migrate client data traffic to the 5 GHz radio bandAnswer
  2. B
    Increase the transmit power level on the 2.4 GHz radios
  3. C
    Enable 40 MHz channel bonding across the 2.4 GHz channels
  4. D
    Reassign all access points to utilize non-overlapping 2.4 GHz channels 1, 6, and 11

Answer

Migrate client data traffic to the 5 GHz radio band
Migrating wireless traffic to the 5 GHz band provides an effective solution because 5 GHz operates in a separate radio frequency spectrum unaffected by 2.4 GHz consumer emissions such as microwave ovens, Bluetooth devices, and cordless phones.

Step-by-Step Solution

1
Identify the RF frequency spectrum shared by the interference sources.
Microwave ovens and Bluetooth devices radiate RF energy within the 2.4 GHz2.4\text{ GHz} ISM frequency band (2.400 GHz2.400\text{ GHz} to 2.4835 GHz2.4835\text{ GHz}).
Understanding the physical band limitations isolates the cause of non-802.11 interference.
2
Evaluate alternative frequency bands available in enterprise wireless deployments.
The 5 GHz5\text{ GHz} frequency band operates completely outside the 2.4 GHz2.4\text{ GHz} range and offers significantly more non-overlapping channels unaffected by microwave radiation or Bluetooth signals.
Shifting wireless traffic to 5 GHz5\text{ GHz} bypasses the polluted spectrum entirely.

Key Concept

RF Interference and Frequency Band Characteristics (2.4 GHz vs 5 GHz)
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Topics

Wireless Principles and Architecture

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