Wireless networks free us from the constraints of the Internet, but the technology behind it is not simple.
1. 802.11 protocol family
802.11 is a set of wireless local area network (WLAN) communication standards established by IEEE, which includes multiple versions and is constantly evolving and upgrading.

In short, from b/g to n/ac/ax, the speed is getting faster and faster, and the anti-interference ability is getting stronger and stronger.

2. Channels and interference
Wireless signals are transmitted through "channels", just like you use different broadcast frequencies to listen to different radio stations.

2.4GHz band: There are 13 channels in total, but only 1, 6, and 11 do not overlap.
5GHz band: more channels, less interference, but poorer wall penetration ability.

Optimization suggestions:

Avoid overlapping channels in 2.4GHz, and use 1, 6, and 11 is recommended;
5GHz has less channel interference and can be deployed first;
Reduce the transmission power when APs are densely deployed to prevent excessive coverage.

3. Wireless encryption method
Wireless networks are inherently "naked" and data can be easily monitored. Therefore, encryption must be used to prevent information leakage. The following is a comparison of common encryption protocols:

4. Practical suggestions for wireless network deployment

Do not stack channels on 2.4GHz and control the transmission power;

5GHz coverage is insufficient but channel interference is low, so mixed deployment is recommended;

Disabling SSID broadcast by default does not mean security, encryption is required;

Turn on client isolation to prevent devices from accessing each other, especially in open environments;

Change passwords regularly and enable MAC address filtering as an auxiliary measure.