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[Reference: https://blogs.arubanetworks.com/industries/understanding-802-11-medium-contention/, According to the IEEE 802.11 - Wikipedia document, one thing that 802.11 stations perform to help avoid collisions on the WLAN medium is to listen to verify that the medium is free before transmitting. This is part of the carrier-sense multiple access with collision avoidance (CSMA/CA) mechanism that 802.11 stations use to coordinate access to the shared medium., References: https://en.wikipedia.org/wiki/IEEE_802.11, , ]