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Problems with Class-based Addressing

The Class A, B & C address model worked fine in the early years of the Internet. Towards the end of the 1980s and in the early 90s it became increasingly clear, with the observed exponential growth in the number of Internet hosts, that it would soon "break" under the load.
 
The main problems were observed to be:
 
A (temporary) solution to both of these problems was introduced by the IETF in 1993 -- Classless Internet Domain Routing, or CIDR (pronounced like "cider"). In this system, the entire class A, B and C scheme has been discarded for all recent IP address allocations.
 
Lecture 11: The IP Protocol #1 Copyright © 2004 P.Scott, La Trobe University Bendigo.



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