With CSMA/CA, the CA stands for Collision Avoidance, which is a different concept than Collision Detection in that the stations are trying to avoid any kind of collision instead of simply detecting it. This is commonly used on wireless networks because a wireless device cannot hear whether communication is occurring between other stations at a specific moment (thus, it cannot use CD).
In such an environment, the plan is to avoid any collisions before sending data on the network and this is commonly implemented as RTS/CTS (ready to send/clear to send). This is usually managed by the . . .
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