Practical Networking by Ben Piper

You know the theory behind networking, but how do you put it into practice? In this course, Practical Networking, you'll learn how to apply the networking theory you already know to real-life situations you might encounter on the job. First, you'll see common networking protocols in action and learn how they interact with each other. Next, you'll explore specific commands and techniques to diagnose and troubleshoot network-related issues. Finally, you'll learn how to read and understand network topology diagrams. When you're finished with this course, you'll have the skills and knowledge of networking needed to diagnose and troubleshoot common network problems.
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