**What You Will Learn**

After reading this chapter, you should be able to

Understand the number systems that are commonly used with computer networks—binary, octal, and hexadecimal

Convert between the binary, octal, decimal, and hexadecimal number systems

Understand the title of this chapter

In everyday life, you work with the decimal number system using the symbols 0 through 9. The decimal number system has 10 symbols and is, therefore, referred to as the *base 10 number system*. There is nothing preventing you from using other number systems with a different number of symbols. A base 2 number system uses 2 symbols, a base 8 number system uses 8 symbols, and a base 16 number system uses 16 symbols. You can ...

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