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802.11n OFDM is more susceptible to high-power, narrowband interference than 802.11a

In order to earn Wi-Fi Alliance certification, 802.11n clients stations are required to support both 2.4 and 5 GHz frequencies

802.11ac devices support the features of the VHT PHY only in the 5 GHz frequency band.

802.11ac is not backwardly compatible with 802.11n or 802.11a.

When HR/DSSS devices are present, VHT MCS rates are disabled for the entire BSS.