Chapter 6. Common Lower-Layer Protocols
Whether troubleshooting latency issues, identifying malfunctioning applications, or zeroing in on security threats in order to be able to spot abnormal traffic, you must first understand normal traffic. In the next couple of chapters, you’ll learn how normal network traffic works at the packet level. We’ll look at the most common protocols, including the workhorses TCP, UDP, and IP, and more commonly used application-layer protocols such as HTTP, DHCP, and DNS. Each protocol section has at least one associated capture file, which you can download and work with directly. This chapter will specifically focus ...
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