To understand more about 802.11 frames and how they are transported, it might be useful to compare them with the familiar 802.3 frames.
Ethernet devices based on IEEE 802.3 send and receive frames in the format shown in Figure 6-1. The sender and the intended recipient of a frame are identified by two MAC addresses—a source and a destination. The source address is not used to deliver the frame; rather, it is used for any return traffic that is sent back to the source. When the recipient receives a frame that has its own MAC address as the destination, the frame is then accepted and processed.