1. Chapter 12 End-to-End Networking

2. FIGURE 12.0.F01: UDP packet fields.

3. FIGURE 12.0.F02: UDP header displayed in Wireshark. © Wireshark Foundation

4. FIGURE 12.0.F03: Routing and internet protocol layering.

5. FIGURE 12.0.F04: Major TCP packet fields.

6. FIGURE 12.0.F05: TCP header displayed in Wireshark. © Wireshark Foundation

7. FIGURE 12.0.F06: A TCP connection summarized by Wireshark. © Wireshark Foundation

8. FIGURE 12.0.F07: TCP flags displayed by Wireshark. © Wireshark Foundation

9. FIGURE 12.0.F08: A “ping” packet shown in Wireshark. © Wireshark Foundation

10. FIGURE 12.0.F09: Domain name hierarchy.

11. TABLE 12.0.T01: Common top-level domain acronyms

12. FIGURE 12.0.F10: Example format of a three-part domain name.

13. FIGURE 12.0.F11: Nslookup list of “any” DNS records found for einsec.com.

14. FIGURE 12.0.F12: Wireshark display of a DNS response. © Wireshark Foundation

15. FIGURE 12.0.F13: Looking up a domain name.

16. FIGURE 12.0.F14: Whois response for stthomas.edu.

17. FIGURE 12.0.F15: A small LAN connects to its ISP through a single gateway.

18. FIGURE 12.0.F16: Network address translation: Processing the first packet.

19. FIGURE 12.0.F17: Configuring a simple gateway product. © Linksys

20. FIGURE 12.0.F18: Application filtering on a software firewall. Screen shot reprinted with permission from Apple Inc.

21. FIGURE 12.0.F19: Cell phone tower. Courtesy of Dr. Richard Smith

22. TABLE 12.0.T02: Dedicated versus dial-up lines

23. FIGURE 12.0.F20: Tower with a microwave antenna. Courtesy of Dr. Richard Smith

24. FIGURE 12.0.F21: Reachability problem.