Try these questions to test your knowledge from this chapter:
- What are the key differences between IPv4 and IPv6?
 - Are the IP addresses given by the ipconfig and ifconfig commands the same IP addresses that a remote web server sees if you connect to it?
 - What is the IPv4 loopback address?
 - What is the IPv6 loopback address?
 - How are domain names (for example, example.com) resolved into IP addresses?
 - How can you find your public IP address?
 - How does an operating system know which application is responsible for an incoming packet?
 
The answers are in Appendix A, Answers to Questions.