802.11 Standards
The IEEE 802.11 family of Wi-Fi standards (a/b/g/n/ac/ax/be) that define wireless speeds and frequencies.
The IEEE 802.11 family defines how wireless devices communicate, each amendment specifying frequency bands, channel widths, and maximum throughput. 802.11b/g run on 2.4 GHz only and 802.11a on 5 GHz only, while 802.11n (Wi-Fi 4) is dual-band across 2.4 and 5 GHz and introduced MIMO. 802.11ac (Wi-Fi 5) is 5 GHz only, and 802.11ax (Wi-Fi 6/6E) extended into the 6 GHz band via the 6E designation. A common trap: 802.11a and 802.11g both reach 54 Mbps, but a uses 5 GHz and g uses 2.4 GHz. Crucially, 802.11ac cannot fall back to 2.4 GHz, unlike dual-band 802.11n.
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