Cisco Certified Support Technician (CCST) NetworkingNetwork AccessMedium
A small business has a single wireless access point (AP) that supports both 2.4 GHz and 5 GHz frequencies. Users report slower speeds and more interference when connecting to the 2.4 GHz band compared to the 5 GHz band. Which of the following is a primary reason for this difference in performance?
- A5 GHz band is generally used for older, slower Wi-Fi standards.
- B2.4 GHz signals have a shorter range than 5 GHz signals.
- CThe 2.4 GHz band is more crowded and has fewer non-overlapping channels.
- D5 GHz channels are more susceptible to interference from common household devices.
Show answer & explanationAnswer & explanation
Correct answer: C. The 2.4 GHz band is more crowded and has fewer non-overlapping channels.
The 2.4 GHz band is more susceptible to interference because it is used by many other devices (Bluetooth, microwaves, cordless phones) and has fewer non-overlapping channels (typically 3: 1, 6, 11). This crowding leads to slower speeds and more interference compared to the 5 GHz band, which offers more channels and less congestion.
Why the other options are wrong
- A. The 5 GHz band supports newer, faster Wi-Fi standards (like 802.11ac and 802.11ax), while 2.4 GHz supports older standards (802.11b/g/n) but also newer ones.
- B. 2.4 GHz signals generally have a longer range and better wall penetration than 5 GHz signals, not shorter.
- D. 5 GHz channels are generally less susceptible to interference from common household devices because fewer devices operate on this band.
2.4 GHz vs. 5 GHz Wi-Fi
Wireless networks operate on either the 2.4 GHz or 5 GHz frequency bands, each with distinct characteristics regarding range, speed, and interference.
- 2.4 GHz: Longer range, better penetration, lower speed, more interference.
- 5 GHz: Shorter range, less penetration, higher speed, less interference.
- Interference on 2.4 GHz from microwaves, Bluetooth, cordless phones.
Memory trick: Fast 5s, Slow 2.4s, Crowded Airwaves, Clearer Views