What is 802.11 and 802.11a/b/g? The Evolution of Wi-Fi: Explained

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CBT Nuggets trainer explores the original 802.11 specification, as well as the first series of enhancements, including 802.11a, 802.11b, and 802.11g.
For any network administrator whose career involves a focus on wireless technologies -- or may some day, Certified Wireless Network Administrator is the perfect certification. The CWNA cert is provided by Certified Wireless Network Professionals, and after taking the CWNA-108 exam, you'll know your way around every technology, device and problem a wireless network could throw at you.
For anyone who manages a wireless network, this wireless training course can be used for CWNA-108 exam prep, onboarding new network administrators, individual or team training plans, or as a reference resource.
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Опубликовано:

15 окт 2024

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@James_Knott 6 месяцев назад

IIRC, the original 802.11 was also on 900 MHz and there was even an infrared version. At the time 802.11b came out, 10 Mb Ethernet was still fairly common, so 11 Mb actually looked good. The 2.4 GHz channel numbers originated with the 1997 version and is why g and n channels 1,6 & 11 are the only non overlapping channels. One performance issue is when b is used in the presence of g or better as b does not understand OFDM. This means that if an OFDM device hears a b signal, it has to send a frame of b to let the b devices know how long the channel will be occupied by the faster device. For this reason, if possible, disable b on access points. Otherwise they will beacon b frames, which will slow down everything else. In fact, you should enable only the slowest you need so, for example, if all your devices support n, you don't need to enable b or g on your access point.