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Beginning with this chapter, we’ll dig into the meat of packet analysis, as we use Wireshark to analyze real-world network problems. In the first part, we’ll analyze scenarios that you might encounter day to day as a network engineer, help desk technician, or application developer—all derived from my real-world experiences and those of my colleagues. We’ll use Wireshark to examine traffic from Twitter, Facebook, and ESPN.com to see how these common services work.