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TCP/IP Guide by Charles M. Kozierok

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Chapter 20. IP CLASSLESS ADDRESSING—CLASSLESS INTER-DOMAIN ROUTING (CIDR)/SUPERNETTING

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As the Internet began to grow dramatically, three main problems arose with the original classful addressing scheme described in the previous chapters. These difficulties were addressed partially through subnet addressing, which provides more flexibility for the administrators of individual networks on an Internet. Subnetting, however, doesn't really tackle the problems in general terms. Some of these issues remain due to the use of classes even with subnets.

While development began on version 6 of the Internet Protocol (IPv6; see Part II-4) and its roomy 128-bit ...

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