Where, really, is the perimeter of the enterprise? There is only one universally correct answer to that question: "I don't know." That, of course, poses problems when trying to defend it. One theory is that the perimeter is wherever you want it to be. For example, if you are a bank with an online banking system, you certainly want a perimeter to protect that service. But, even then, where is the perimeter? The front-end web service is open to the Internet - or the service wouldn't work - and it is connected to a back-end database. So, is the perimeter the web front-end or somewhere between the web server and the database server?
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