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Re: port scan detection
Well for a port being open, I would say you would somehow check if there is a program/service listening for connection requests. For example if you wanted to get all the active phone numbers in a certain area code you could simply dial them one by one. If someone picks up then you say is an "open" port. This isn't a perfect analogy, because you would get a different signal, but I hope you still get the point.
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