EC-Council Certified Ethical Hacker (CEH) v12Wireless Network HackingEasy
A cybersecurity analyst is tasked with performing a site survey for a new corporate wireless network in a multi-story building. The goal is to ensure optimal coverage and minimize interference. While using a spectrum analyzer, the analyst identifies significant interference in the 5 GHz band, specifically from devices operating on channels typically used by Wi-Fi. Which of the following is the MOST likely source of this interference?
- ACordless phones
- BMicrowave ovens
- CBluetooth headphones
- DRadar systems
Show answer & explanationAnswer & explanation
Correct answer: D. Radar systems
Radar systems, particularly weather radar and military radar, operate in the 5 GHz band and can cause significant interference with Wi-Fi networks using the same frequency range. They often utilize DFS channels.
Why the other options are wrong
- A. Most cordless phones operate in the 2.4 GHz or 1.9 GHz DECT bands, not 5 GHz.
- B. Microwave ovens operate at approximately 2.45 GHz and are a common source of 2.4 GHz interference.
- C. Bluetooth headphones typically operate in the 2.4 GHz band, not 5 GHz.
5 GHz Interference Sources
Various devices can cause interference in the 5 GHz wireless band, impacting Wi-Fi network performance and reliability.
- 5 GHz Wi-Fi offers higher bandwidth and less congestion than 2.4 GHz.
- Sources of interference include radar, satellite communication, and certain cordless phones.
- Dynamic Frequency Selection (DFS) is used by Wi-Fi to avoid radar interference.
Memory trick: Radar's pulse disrupts 5 GHz Wi-Fi's flow.