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The Medium Access Control (MAC) technique of standard WLANs, called the Distributed Coordination Function (DCF), is Carrier Sense Multiple Access based on Collision Avoidance (CSMA/CA) scheme with binary slotted exponential backoff. It has a two way handshaking technique for packet transmission and also defines an additional four way handshaking technique called RTS/CTS mechanism, which is used to reduce the hidden terminal problem. The RTS/CTS frames carry the information of the packet length to be transmitted which can be read by any listening stations, to update a Network Allocation Vector (NAV) about the information of the period of time in which the channel is busy.
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