When I started my career in Information Technology (too many years ago to mention), the corporate network at the company I was working for consisted of private leased lines to other cities within the United States. There was a single production mainframe computer that basically only had two types of devices that it communicated with, dumb terminals and printers. Security was straightforward, physically protecting the mainframe computer and peripherals was the most important item. Today it’s a totally different story.
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