CompTIA Tech+ (FC0-U71)InfrastructureMedium
A network technician is configuring a new Wi-Fi access point in an industrial facility. Due to the presence of heavy machinery and large metal structures, the technician is concerned about signal degradation and interference. Which Wi-Fi frequency band is generally more susceptible to attenuation and interference from physical obstructions and therefore less suitable for this environment?
- A2.4 GHz
- B5 GHz
- C60 GHz
- D6 GHz
Show answer & explanationAnswer & explanation
Correct answer: B. 5 GHz
Higher frequency Wi-Fi bands (like 5 GHz, 6 GHz, and 60 GHz) are more susceptible to attenuation and interference from physical obstructions (walls, metal, machinery) due to their shorter wavelengths. The 2.4 GHz band, with its longer wavelength, penetrates objects better and is generally more resilient in environments with many obstructions, despite being more prone to interference from other wireless devices.
Why the other options are wrong
- A. The 2.4 GHz band has longer wavelengths, allowing it to penetrate objects better and making it less susceptible to physical obstructions, though it suffers from more general interference.
- C. The 60 GHz band (WiGig) offers very high speeds but has an extremely short range and is highly susceptible to any obstructions, primarily used for line-of-sight connections.
- D. The 6 GHz band (Wi-Fi 6E) is even more susceptible to physical obstructions than 5 GHz due to its higher frequency.
Wi-Fi Frequency Band Attenuation
The weakening of a Wi-Fi signal as it passes through physical obstructions (walls, metal, water), which is more pronounced at higher frequencies (shorter wavelengths).
- Higher frequencies (5 GHz, 6 GHz) have shorter wavelengths.
- Shorter wavelengths are more easily absorbed or reflected by objects.
- 2.4 GHz (longer wavelength) penetrates objects better but has more interference from other devices.
- Industrial environments with metal structures severely impact higher frequency bands.
Memory trick: Higher the Hertz, shorter the reach, more obstructed, the less it can preach.