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What does 802.11x mean?

802.11 is a standard that was developed by the Institute of Electrical and
Electronic Engineers (IEEE). It is the original wireless specification.
Extensions of the 802.11 standard were given the same number with a letter
suffix.802.11 Provides up to 2Mbps transmission in the 2.4GHz band
802.11b Provides up to 11Mbps transmission in the 2.4GHz band
802.11a Provides up to 54Mbps transmission in the 5GHz band
802.11g Provides up to 54Mbps transmission in the 2.4GHz band