CompTIA A+ Core 1 (220-1201)HardwareMedium
A technician is installing a new dual-band wireless access point (WAP) that supports both 2.4 GHz and 5 GHz frequencies. Which of the following statements accurately describes a characteristic of the 5 GHz band compared to the 2.4 GHz band?
- AThe 5 GHz band is backward compatible with all older Wi-Fi devices.
- BThe 5 GHz band typically has more available channels and less interference from other devices.
- CThe 5 GHz band is generally slower but more reliable in crowded environments.
- DThe 5 GHz band offers a longer range and better penetration through walls.
Show answer & explanationAnswer & explanation
Correct answer: B. The 5 GHz band typically has more available channels and less interference from other devices.
The 5 GHz band offers more non-overlapping channels than 2.4 GHz, leading to less interference from other Wi-Fi networks and common household devices (like microwaves, cordless phones). However, it has a shorter range and poorer penetration through obstacles.
Why the other options are wrong
- A. This is incorrect; 5 GHz is not backward compatible with older Wi-Fi devices that only support 2.4 GHz (e.g., 802.11b/g).
- C. This is incorrect; the 5 GHz band is generally faster, though its reliability can be affected by its shorter range and poorer penetration.
- D. This is incorrect; 5 GHz has a shorter range and poorer penetration compared to 2.4 GHz.
Dual-Band Wi-Fi Characteristics
Dual-band Wi-Fi operates on two distinct radio frequency bands, 2.4 GHz and 5 GHz, each with unique advantages and disadvantages in terms of range, speed, and interference.
- 2.4 GHz offers longer range and better penetration but is more susceptible to interference.
- 5 GHz offers higher speeds and less interference but has a shorter range and struggles with obstacles.
- Modern WAPs and devices support both bands to optimize performance.
Memory trick: Wi-Fi bands: '2.4' for 'Range', '5' for 'Speed' and 'Space'.