What Is Wi-Fi?
Wi-Fi — the wireless networking technology that connects devices to a LAN over radio instead of cables — letting laptops, phones and IoT devices join the network without wires.
How it works
Wi-Fi (based on the IEEE 802.11 standards) uses radio frequencies (2.4 GHz and 5 GHz, now 6 GHz) to connect devices to an access point, which bridges them onto the wired network. Generations (Wi-Fi 5, 6, 6E, 7) have steadily increased speed and efficiency. Security evolved from WEP through WPA2 to WPA3.
Why it matters
Wi-Fi is how most devices actually connect today, making wireless fundamentals (channels, bands, security, access points, controllers) a real part of networking — covered in CCNA. See wireless LAN fundamentals for the depth.
Frequently asked questions
What is Wi-Fi?
A wireless networking technology (IEEE 802.11) that connects devices to a network over radio waves instead of cables, via an access point.
What are the Wi-Fi frequency bands?
Primarily 2.4 GHz (longer range, more interference) and 5 GHz (faster, more channels), with newer 6 GHz support in Wi-Fi 6E and Wi-Fi 7.
What is the most secure Wi-Fi standard?
WPA3 is the current strongest; WPA2 remains widely used and acceptable. WEP and open networks should be avoided.
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