How the Internet Looks
You'll have to look hard to find a description of what the Internet really is. Most descriptions of the Internet, unfortunately, favor simplicity over detail, and the reader is left with little more than the vague impression that the Internet is “a highway for data.”
In fact, the details of Internet topology are so complex that few professional network administrators can tell you precisely what happens to the data that leaves their lines. Nor is it necessary for them to know. The stability and versatility of TCP/IP make it possible for a datagram to enter the cloud of the Internet and emerge without oversight in exactly the right place on the other side of the Earth. Where does the datagram go when it enters that cloud? ...
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