Suppose there are two ISPs providing WiFi access in a particular cafe, with each

Question

Suppose there are two ISPs providing WiFi access in a particular cafe, with each ISP operating its own AP and having its own IP address block.

Suppose that by accident, each ISP has configured its AP to operate over Channel 11.

Will the 802.11 protocol completely break down in this situation?

Discuss what happens when two stations. each associated with a different ISP, attempt to transmit at the same time.

Suppose that one AP operates over Channel 1 and the other over Channel 11. How do your previous answers change?

Explanation / Answer

If you live in a dense wifi area, there are AP's that overlap on certain channels. Basically the network traffic contains the destination MAC sent from your computer, so only the appropriate router will respond. It will still work, although you might experience some performance degradation, depending on how many AP's are using that channel.

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