In the early days of wireless networks, you did not have to worry too much about compatibility because there were two standards and they were very different: 802.11a, which used 5 GHz frequencies but had a limited operating distance, and 802.11b, which used a completely different set of frequencies, was susceptible to more interference problems, and was slower but it operated over larger distances. Because these two standards were so different, there was no need to be compatible because they used different frequencies to communicate and this was done in a completely different way.
However, when 802.11g . . .
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