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Chapter 7. More Fun with IP Addresses
What You Will LearnAfter reading this chapter, you should be able to answer the following questions:What is subnetting?How many addressing levels are possible in an IP address?What are some of the benefits of subnetting?What are two main drawbacks of subnetting?Can you see a subnetwork address in a dotted-decimal IP address?What is a base address?What is an extended network prefix and what does it do?What are three types of masks encountered in an IP network? What does each do?
Just when you thought you learned all there is to know about IP addresses, you turned to the next chapter and realized you were wrong! There's a whole lot more to those little strings of dotted decimal numbers than meets the eye. The preceding chapter shows you how an IP address can be cut into two components: the network address and the host address. This chapter shows you a third dimension to IP addressing known as subnetting. Subnetting is a process by which you take a network address and chop it up into smaller pieces. Each piece can then be used as a network address. Thus, you can use a single network address space for several networks…if you know what you're doing!This chapter shows you how subnets get created, why they are useful, and how they are used. It even walks you through the mathematics of subnetting so you can better appreciate this fascinating aspect of TCP/IP.
