What Is a WAN
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A WAN is, quite simply, a network which covers a large geographical area. It connects several physically remote locations one to the other.
The simplest way to think of a WAN is by thinking of a wide area network we already know: The public telephone system. When you think about it, the telephone system we all know and use in our day-to-day life is simply one huge network, connecting remote geographical locations. I.e, it is a Wide Area Network!
Since this analogy is so simple yet relatively accurate, we will use the phone system as an analogy throughout this text. Let us first begin with two diagrams, showing the telephone network next to a computer WAN (notice the similarities).
The Phone System:
A Wide Area Network: