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CCENT/CCNA ICND1 100-101 Official Cert Guide by Wendell Odom

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One Size Subnet Fits All—Or Not

The final choice in the initial planning step is to decide whether you will use a simpler design by using a one-size-subnet-fits-all philosophy. A subnet’s size, or length, is simply the number of usable IP addresses in the subnet. A subnetting design can either use one size subnet, or varied sizes of subnets, with pros and cons for each choice.

Defining the Size of a Subnet

Before you finish this book, you will learn all the details of how to determine the size of the subnet. For now, you just need to know a few specific facts about the size of subnets. Chapter 12, “Analyzing Classful IPv4 Networks,” and Chapter 13, “Analyzing Subnet Masks,” give you a progressively deeper knowledge of the details.

The engineer ...

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