IP Subnetting
Subnetting is one of the most important topics in the world of networking. You need to know how subnetting works and how to “do the math” to figure out issues when subnetting is in use, both in real life and on the exam. Part IV of this book covers the details of subnetting concepts, motivation, and math, but you should have a basic understanding of the concepts before covering the topics between here and Part IV.
Subnetting defines methods of further subdividing the IPv4 address space into groups that are smaller than a single IP network. IP subnetting defines a flexible way for anyone to take a single Class A, B, or C IP network and further subdivide it into even smaller groups of consecutive IP addresses. In fact, the name
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