Classless and Classful Addressing
The terms classless addressing and classful addressing refer to the two different ways to think about IPv4 addresses as described so far in this chapter. Classful addressing means that you think about Class A, B, and C rules, so the prefix is separated into the network and subnet parts, as shown in Figures 15-6 and 15-7. Classless addressing means that you ignore the Class A, B, and C rules and treat the prefix part as one part, as shown in Figures 15-4 and 15-5. The following more formal definitions are listed for reference and study:
Classless addressing: The concept that an IPv4 address has two parts—the prefix ...
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