Wireless LAN Fundamentals: How Wi-Fi Works
A wireless LAN (Wi-Fi) connects devices over radio instead of cables. Devices join a network named by its SSID, communicating with an access point (AP) that bridges wireless traffic onto the wired LAN. Larger deployments centralise AP management with a wireless LAN controller (WLC).
Channels and bands
Wi-Fi uses two main bands. 2.4 GHz travels further but has only three non-overlapping channels (1, 6, 11) and more interference. 5 GHz is faster with many more non-overlapping channels but shorter range. Choosing non-overlapping channels avoids co-channel interference — a key design point.
Wi-Fi security
Security has evolved from insecure WEP → WPA → WPA2 (long the standard) → WPA3 (today's strongest, using SAE). Always use WPA2 or WPA3. In enterprise deployments, 802.1X ties Wi-Fi login to a RADIUS server for per-user authentication — a bridge into security topics.
Frequently asked questions
What is an SSID?
The name of a wireless network that identifies it to client devices.
What is the difference between 2.4 GHz and 5 GHz Wi-Fi?
2.4 GHz has longer range but fewer channels and more interference; 5 GHz is faster with more non-overlapping channels but shorter range.
What is the most secure Wi-Fi standard?
WPA3 is the current strongest standard; WPA2 remains widely used and acceptable. WEP and open networks should be avoided.
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