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Cisco Networking Simplified, Second Edition by Paul Della Maggiora, Neil Anderson, Jim Doherty

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Part I. Networking Fundamentals

Networking Fundamentals

Before we begin talking about specific networking technologies and applications, it’s worth taking a few pages to go over some networking fundamentals. Networks exist for the sole purpose of sharing information between people or machines. However, to share information, rules must be followed to ensure that the myriad combinations of devices, transports, hardware, and software can communicate smoothly.

In “How Computers Communicate,” we cover the most basic aspects of computer networking, starting with the OSI model. This communication model is the basis for all other topics discussed in this book, so it’s a great place ...

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