IEEE 802.11: Addressing

Next figure shows the data frame format in IEEE 802.11. As it can be seen, the frame contains four different address fields.

This figure shows the 802.11 frame format. It contains four address fields, frame control field and CRC.

Address fields in IEEE 802.11 frame are used to distinguish among source, destination and routers.

This figure shows a typical wireless LAN connected to Internet through a router. Host H1 sends a frame to the AP with AP, Host and Router addresses. Once the frame gets the AP, it embeds the data in an Ethernet frame to reach the router. This frame only contains the Router and Host addresses.
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