Control Frames
Request to Send (RTS)— A station asks an AP for permission to send data. This is a traffic management feature designed to help reduce collisions.
Clear to Send (CTS)— After an RTS is received, the AP will respond with a CTS frame indicating it is ready to receive data.
Acknowledgement (ACK)— After a station or AP receives an error-free frame, it sends an ACK frame to the sender to let it know that the transmission was successful.
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