300-430 Question 120
Select 3During a wireless site survey, you notice significant interference in the 2.4 GHz band. The interference causes frequent disconnections and degraded performance for client devices. Which of the following are potential sources of this interference?
- A
Microwave ovens operating near the access points
- B
Bluetooth devices in active use nearby
- C
Cordless phones using the 5 GHz frequency
- D
Motion detectors installed in the same area
- E
Wi-Fi networks on overlapping 2.4 GHz channels
Show answer and explanation
Correct answers: A, B, E
Explanation
Interference in the 2.4 GHz band can arise from various sources, including non-Wi-Fi devices like microwave ovens and Bluetooth devices, as well as other Wi-Fi networks configured on overlapping or adjacent 2.4 GHz channels. Identifying and mitigating these interferers is critical to improving network performance in this frequency band.
- A. Correct.
Microwave ovens operate in the 2.4 GHz frequency range and can cause significant interference to Wi-Fi signals, especially when in close proximity to access points.
- B. Correct.
Bluetooth devices also operate in the 2.4 GHz band and can create interference when they are actively transmitting data near a Wi-Fi network.
- C. Incorrect.
Cordless phones using the 5 GHz frequency will not interfere with the 2.4 GHz Wi-Fi band. However, cordless phones operating in the 2.4 GHz range would have been a source of interference.
- D. Incorrect.
Motion detectors typically do not operate in the 2.4 GHz frequency range and are unlikely to be a source of interference for Wi-Fi.
- E. Correct.
Wi-Fi networks on overlapping 2.4 GHz channels can cause co-channel or adjacent-channel interference, which degrades overall performance in the 2.4 GHz band.