Practice Choosing Subnet Masks
Before moving on to the next section, practice until you get the right answer most of the time—but use any tools you want and take all the time you need. Then, you can move on with your reading.
However, before taking the exam, practice until you master the topics in this chapter and can move pretty fast. As for time, you should try to find the entire answer—all the masks that meet the requirements, which maximizes the number of subnets, and which maximizes the number of hosts—in around 15 seconds. Table 19-3 summarizes the key concepts and suggestions for this two-phase approach.
Table 19-3 Keep-Reading and Take-Exam ...
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