Cisco Certified Support Technician CCST Networking 100-150 Official Cert Guide

Part I

Foundations

Computer networks are almost magical: you send an image from this device, and it appears on some other device almost instantly, even when there is no apparent physical connection between the two devices. The reality is far more commonplace that it appears from the outside.

Thinking About Moving Packets

There is, in fact, a direct physical connection between all the devices on planet Earth (and network-connected devices in space!) over which signals are carried between devices, no matter how remote. The magic has, as it turns out, a physical connectivity infrastructure just as real as roads.

This book begins the process of untangling the magic behind computer networking, from the physical through the logical.

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