TCP IP by Todd Lammle

Author:Todd Lammle [Lammle, Todd]
Language: eng
Format: azw3
ISBN: 9781119472704
Publisher: Wiley
Published: 2017-10-23T04:00:00+00:00

To find up-to-the minute updates for this chapter, please see www.lammle.com/ccna or the book’s web page at www.sybex.com/go/ccna.

Subnetting Basics

In Chapter 1, “Introduction to TCP/IP,” you learned how to define and find the valid host ranges used in a Class A, Class B, and Class C network address by turning the host bits all off and then all on. This is very good, but here’s the catch: you were defining only one network, as shown in Figure 2.1.

Figure 2.1 One network

By now you know that having one large network is not a good thing because the chapter you just read was veritably peppered with me incessantly telling you that! But how would you fix the out-of-control problem that Figure 2.1 illustrates? Wouldn’t it be nice to be able to break up that one, huge network address and create four manageable networks from it? You betcha it would, but to make that happen, you would need to apply the infamous trick of subnetting because it’s the best way to break up a giant network into a bunch of smaller ones. Take a look at Figure 2.2 and see how this might look.

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