300-430 Question 117
Select 4A network engineer is troubleshooting poor performance in an enterprise wireless network. After analyzing the RF spectrum, the engineer identifies a high level of interference on the 2.4 GHz band. Which of the following are likely sources of interference in this scenario?
- A
Microwave ovens
- B
Bluetooth devices
- C
DFS-enabled radar systems
- D
Cordless phones operating at 2.4 GHz
- E
Zigbee devices
Show answer and explanation
Correct answers: A, B, D, E
Explanation
Interference on the 2.4 GHz band can arise from various non-Wi-Fi devices that operate within the same frequency range. Understanding potential interferers, such as microwave ovens, Bluetooth devices, Zigbee devices, and 2.4 GHz cordless phones, is crucial for identifying and mitigating performance issues in an enterprise wireless network. DFS-enabled radar systems, however, are specific to the 5 GHz band and do not impact the 2.4 GHz band.
- A. Correct.
Microwave ovens are common sources of interference on the 2.4 GHz band because they emit electromagnetic radiation in the same frequency range.
- B. Correct.
Bluetooth devices operate on the 2.4 GHz band and use frequency hopping, which can cause interference with Wi-Fi networks using the same band.
- C. Incorrect.
DFS-enabled radar systems operate on the 5 GHz band, not the 2.4 GHz band, so they are not relevant in this scenario.
- D. Correct.
Cordless phones that operate at 2.4 GHz can interfere with Wi-Fi signals in the same frequency range.
- E. Correct.
Zigbee devices also use the 2.4 GHz band and can contribute to interference with Wi-Fi networks.