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Sams Teach Yourself Network Troubleshooting in 24 Hours, Second Edition by Jonathan Feldman

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Hour 2. The OSI Model of Networking: Understanding the Old School

Simplicity doesn’t mean living in misery and poverty. You have what you need, and you don’t want to have what you don’t need.

——Charan Singh

A seven-layer cake is perhaps one of your best tools for understanding the complex interactions between different networking functions. Oh c’mon, I’ve got to be kidding, right?

No, really, one of the ways that network architects simplify the incredibly complex world of networking is by dividing it into seven areas of functionality. This model of modern networking looks very much like a layer cake; it is called the OSI (Open Systems Interconnect) model. It was created by the ISO (the International Standards Organization) earlier this century ...

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