Question 3: Suppose there are two ISPs providing WiFi access in a particular caf

Question

Question 3:
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? Question 3:
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? Question 3:
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

Below answer is for the first part:

The two APs will typically have different SSIDs and MAC addresses. A wireless
device arriving to the cafe will associate with one of the SSIDs (that is, one of the
APs). After association, there is a virtual link between the new device and the AP.

For Example: Label the APs AP1 and AP2. Suppose the new device associates with AP1. When
the new device sends a frame, it will be addressed to AP1. Although AP2 will
also receive the frame, it will not process the frame because the frame is not
addressed to it. Thus, the two ISPs can work in parallel over the same channel.
However, the two ISPs will be sharing the same wireless bandwidth. If wireless
devices in different ISPs transmit at the same time, there will be a collision. For
802.11b, the maximum aggregate transmission rate for the two ISPs is 11 Mbps.

And below answer is for the second part :

Now if two wireless devices in different ISPs (and hence different channels)
transmit at the same time, there will not be a collision. Thus, the maximum
aggregate transmission rate for the two ISPs is 22 Mbps for 802.11b.

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