Why does the WiFi (802.11) link-layer frame have three addresses? [Note: WiFi actually has four MAC addresses in the frame, but we're only focusing here on the three widely used ones].

Question

Accepted Answer

Because both the access point that will relay this frame to the intended link-layer receiving host or router interface, as well as that intended destination host or router interface need to be specified.

Answer

Because there may be two hosts or routers that are possible destinations for this link-layer frame and we need to identify which of these is the intended receiver.

Answer

Because the sender of this frame can be either the access point or a link-layer host or router interface, and we need to identify which of these two is the sender.

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Why does the WiFi (802.11) link-layer frame have three addresses? [Note: WiFi ac...

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