S = P – N = 30 – 24 = 6.
H = 32 – P = 32 – 30 = 2.
ptg29743230
13
Chapter 13: Analyzing Subnet Masks 315
This example uses a popular mask for serial links because serial links only require two host
addresses, and the mask supports only two host addresses.
Practice Analyzing Subnet Masks
As with the other subnetting math in this book, using a two-phase approach may help. Take
time now to practice until you feel as though you understand the process. Then, before the
exam, make sure you master the math. Table 13-9 summarizes the key concepts and sugges-
tions for this two-phase approach.
Table 13-9 Keep-Reading and Take-Exam Goals for This Chapter’s Topics
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