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This chapter is from the book

This chapter is from the book

Hexadecimal

The CCNA exam(s) will ask you a few questions on the conversion of binary to hexadecimal and back, so you need to understand how it works. An understanding of hex is also a useful skill for other areas of networking and computer science.

Binary is Base2; Decimal is Base10; Hexadecimal is Base16. Each column in hex can represent 16 possible values, from 0 through 15. In order to represent a value of 10 through 15 with a single character, hex uses the letters A through F. It is important to understand that the values of 0 through 15 are the possible values of a 4-bit binary number, as shown in Table 3.6.

Table 3.6 Decimal, Binary, and Hex Values Compared

Decimal

Binary

Hex

0

0000

0

1

0001

1

2

0010

2

3

0011

3

4

0100

4

5

0101

5

6

0110

6

7

0111

7

8

1000

8

9

1001

9

10

1010

A

11

1011

B

12

1100

C

13

1101

D

14

1110

E

15

1111

F

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