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TCP/IP Guide by Charles M. Kozierok

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Chapter 18. IP SUBNET ADDRESSING (SUBNETTING) CONCEPTS

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In the previous chapter, we looked at the original classful IP addressing scheme, which conceptually divides a large internetwork into a simple two-level hierarchy that includes many networks of different sizes, each of which contains a number of hosts. The system works well for smaller organizations that may connect all their machines in a single network. However, it lacks flexibility for large organizations that often have many subnetworks, or subnets. To better meet the administrative and technical requirements of larger organizations, the classful IP addressing system was enhanced through ...

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