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1. Packet Analysis and Network Basics

Chapter 1. Packet Analysis and Network Basics

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A million different things can go wrong with a computer network on any given day—from a simple spyware infection to a complex router configuration error—and it’s impossible to solve every problem immediately. The best we can hope for is to be fully prepared with the knowledge and tools we need to respond to these types of issues.

All network problems stem from the packet level, where even the prettiest looking applications can reveal their horrible implementations, and seemingly trustworthy protocols can prove malicious. To better understand network problems, we go to the packet level. Here, nothing is hidden from us—nothing is obscured by misleading menu structures, eye-catching graphics, or untrustworthy employees. At this level, there are no true secrets (only encrypted ones). The more we can do at the packet level, the more we can control our network and solve problems. This is the world of packet analysis.


  

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