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Introduction

Networks are interesting systems. Not too many years ago, a network was defined as two or more computers, connected together by physical cables or telephone lines. They were slow, and they went down (crashed) as much as they were up. The word, network, could bring fear to the hearts of even the stoutest computer system managers. Today, networks are rock solid and reliable. The Web can be defined as one huge network of interconnected computers around the world.

Networks connect more than computers; they work with PDA's, cell phones, televisions, and even wristwatches. And no longer do networks require physical cables. If your computer is equipped with a wireless port, you can connect to the Internet and surf the Web or even check your e-mail, from most major airports and hotel lobbies, without plugging your computer into anything.


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