Classful Vs Classless?
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Classful networks use a system of fixed length network prefixes, while classless networks use variable length network prefixes. Classful networks use class A, B, and C addresses, while classless networks use CIDR (Classless Inter-Domain Routing) addresses, which support a much more flexible addressing scheme than the classful networks. Classful networks were the original IP addressing system, and were used prior to the introduction of CIDR. Classful networks are considered outdated and are rarely used in modern networks.