Suppose there are two ISPs pro

Suppose there are two ISPs providing WiFi access in a particular café, with each ISP operating its own AP and having its own IP address block.
a. Further 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.
b. Now suppose that one AP operates over channel 1 and the other over channel 11. How do your answers change?