EC-Council Certified Ethical Hacker (CEH) v12Wireless Network HackingEasy
A security analyst is performing a site survey for a new wireless deployment and is concerned about potential interference from non-Wi-Fi devices. Which frequency band is most susceptible to interference from common household appliances like microwave ovens and cordless phones, requiring careful channel planning to avoid performance degradation?
- A60 GHz band
- B2.4 GHz band
- C6 GHz band
- D5 GHz band
Show answer & explanationAnswer & explanation
Correct answer: B. 2.4 GHz band
The 2.4 GHz band is widely used by many non-Wi-Fi devices, including microwave ovens, cordless phones, and Bluetooth devices. These devices can cause significant interference, leading to poor Wi-Fi performance, making careful channel planning crucial in this band.
Why the other options are wrong
- A. The 60 GHz band (WiGig) is used for very short-range, high-bandwidth applications and is not typically affected by household appliances like microwaves.
- C. The 6 GHz band (Wi-Fi 6E) is relatively new and has even less interference from legacy devices.
- D. The 5 GHz band generally experiences less interference from common household appliances compared to 2.4 GHz.
2.4 GHz Interference Sources
The 2.4 GHz Wi-Fi frequency band is prone to interference from a multitude of non-Wi-Fi devices, including microwave ovens, cordless phones, Bluetooth devices, and baby monitors, due to their shared use of this unlicensed spectrum.
- Shared with many common household and industrial devices.
- Fewer non-overlapping channels (3 in most regions).
- Leads to slower speeds and unreliable connections if not properly managed.
Memory trick: 2.4 GHz is the crowded party where everyone brings their noisemakers.