Chapter 19. Subnet Design

So far in this book, most of the discussion about IPv4 used examples with the addresses and masks already given. This book has shown many examples already, but the examples so far do not ask you to pick the IP address or pick the mask. Instead, as discussed back in Chapter 11, “Perspectives on IPv4 Subnetting,” this book so far has assumed that someone else designed the IP addressing and subnetting plan, and this book shows how to implement it.

This chapter turns that model around. It goes back to the progression of building and implementing IPv4, as discussed in Chapter 11, as shown in Figure 19-1. This chapter picks up the story right after some network engineer has chosen a Class A, B, or C network to use for the ...

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