The textbook website has a wealth of links, quizzes and cool Java applets that allows you to visualize some of the fundamental networking concepts covered by this course.
The Wireshark traces for the Wireshark labs in the book.
Wireshark is freely available for download. You need to be an administrator (or have the rights of one) to install WinPcap (the packet capture library) and to capture packets, but you can read traces without being one.
Some assignments ask you to
Many sample trace files are available at the Wireshark Sample Capture web page.
Simple trace of an HTTP request for a sample page between two machines on a private network.
Wireshark trace files for www.google.com and for www.yahoo.com.
Traces showing HTTP (conditional) downloads for google.com: the first and the second time.