Address waste is a serious problem in today's networks. Obtaining an IP address is difficult because of constant growth and increasing numbers of users. Aggressive effort is required to spare address space from being used inappropriately. This issue will be discussed further in the next section, "Classless Interdomain Routing."
For this reason, you should perform variable-length subnet masking (VLSM) with point-to-point networks. VLSM grants transit broadcast networks a large number of bits for the host portion, and only allows the point-to-point network to use two bits for the host portion.
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