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This Concept Map, created with IHMC CmapTools, has information related to: 802.11 Control Frame, Physical Carrier Sense performs Clear Channel Assessment (CCA), Carrier Sense can be Physical Carrier Sense, Clear to Send (CTS) Frame is part of RTS/CTS, 802.11 Control Frame such as Acknowledgement (ACK) Frame, Protection Mechanism uses ERP Information Element, 802.11 Control Frame such as Contention Free Frames (CF-End, CF-End+CF-ACK), Physical Carrier Sense performs Synchronization, Block Acknowledgement Request (BAR) Frame provides delivery verification of multiple Unicast Frame, PS-Poll Frame requests delivery of single buffered Unicast Frame, Block Acknowledgement Request (BAR) Frame can be Multi-TID Block ACK Request, 802.11 Control Frame has MAC Header, 802.11 Control Frame such as Block Acknowledgement Request (BAR) Frame, Block Acknowledgement Request (BAR) Frame can be Basic Block ACK Request, RTS/CTS helps to overcome Hidden Node Problem, NAV Distribution reserves medium using Network Allocation Vector (NAV), Virtual Carrier Sense uses Duration/ID Field, 802.11 Control Frame such as PS-Poll Frame, Station can be in the Doze State, RTS/CTS is used to implement Protection Mechanism, CTS-to-Self uses Clear to Send (CTS) Frame