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802.11 anything is half duplex in practice. Only one station can speak at a time because of the CSMA/CA algorithm. It's the only way to ensure that there is no "collision" between 2 transmitting stations on a single channel. Mind you, that the CSMA/CA algorithm is applied per channel, not per SSID. So, if you have a neighbor on the same channel as you, both of your APs and all stations on the same channel are competing for "talk time" on the channel.

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Q: 802.11a channels are full duplex or half duplex?
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