Identifying Subnet Design Choices Using Masks
Subnet masks have many purposes. In fact, if ten experienced network engineers were independently asked, “What is the purpose of a subnet mask?” the engineers would likely give a variety of true answers. The subnet mask plays several roles.
This chapter focuses on one particular use of a subnet mask: defining the prefix part of the IP addresses in a subnet. The prefix part must be the same value for all addresses in a subnet. In fact, a single subnet can be defined as all IPv4 addresses that have the same value in the prefix part of their IPv4 addresses.
While the previous paragraph might sound a bit formal, the idea is relatively basic, as shown in Figure 15-3. The figure shows a network diagram, ...
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