The Evolution of IEEE 802 11 standards - BAG NAC

IEEE 802.11 standards refers to the set of layer 1 and layer 2 specifications for a wireless LAN. Since the base version was released in 1997, there have been five major different versions in the past 20 years.
These five versions include 802.11b, 802.11a, 802.11g, 802.11n, and 802.11ac. I use a mnemonic “BAG NAC” or “Big Awful Gym Needs AC.” to help me to remember them.
Collectively these 802.11 standards are known as wireless fidelity, or a term we are more familiar with: Wi-Fi.

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https://www.youtube.com/watch?v=PcbTMSf0D2M&list=PLSNNzog5eydvJG48PYnWnNY7-tQIfxTRb

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