Chapter 16. Designing Subnet Masks

This chapter covers the following subjects:

Choosing the Mask(s) to Meet Requirements: This section discusses the ideas behind choosing a subnet mask, in particular making sure the mask meets requirements.

Practice Choosing Subnet Masks: This section supplies suggestions for how to practice the math related to this chapter.

Chapter 12, “Perspectives on IPv4 Subnetting,” provided an overall view of the subnet design and implementation process. To begin, the engineer analyzes the needs to decide the required number of subnets and hosts/subnet. During the second major step, the engineer chooses a particular classful network, and then picks a single subnet mask to use: a mask that meets the requirements identified ...

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