A friend of mine is taking a UNIX systems class and mentioned to me that when they take exams they do so on their computers. That is all students are using their own computer/laptop. Students are not being provided a computer by the professor. In an attempt to prevent cheating and googling of the answers, all student's are required to connect to a router that the professor has set up in order to take the exam. This router is not connected to the internet.
If anyone disconnects from the router during the exam time the professor then knows that they were potentially trying to use the internet. Apparently he has told his class that this system is "foolproof" and is so confident in its ability to prevent student network access he often leaves the room during the exam.
I admit that I'm not particularly well versed in this area of networking but theoretically couldn't this safeguard be defeated by using something resembling a man in the middle attack. You spoof a MAC address and IP and send that to the target router, which then thinks you are connected even though there is no real connection? Or is this problem network card based, where the vast majority of computers only have 1 wifi card and can therefore only do network related tasks for 1 network at a time.