Describe the operation of the IEEE802.11 MAC collision avoidance scheme used to facilitate basic frame transmission. Extend your flow diagram to include the basic acknowledgement scheme adopted in the IEEE 802.11 MAC. If a node supports DCF with extensions, extend your flow diagram to include the exchange of RTS and CTS frames to avoid the hidden terminal problem. Draw an appropriate flow diagram that describes the operation of the access point in implementing IEEE802.11 MAC PCF control