Summary: Wireless is a half-duplex medium. Unlike Ethernet, wireless devices must contend for air time to transmit their frames. To avoid collisions, there are a number of mechanisms used:<br> <br> * Physical Carrier Sense<br> * Virtual Carrier Sense<br> * a Coordination Function<br> <br> In this episode, I go over these mechanisms and describe their purpose.<br> Here is a screenshot of a wireless frame showing the Duration value within the header. This Duration value is used to set a device’s NAV timer.<br> <br> Links and Resources<br> <br> * <a href="https://www.cwnp.com/uploads/802-11_arbitration.pdf">802.11 Arbitration</a><br> <br>
