D-Link DES-3326S - Switch - Stackable Uživatelská příručka stáhnout pdf (Strana 82)

DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

82 Switch Management and Operating Concepts

grouped together in bytes, or eight bits. (A bit is a binary

digit – either a “1” or a “0”). The dots (periods) simply make the

IP address easier to read. A computer sees an IP address not

as four decimal numbers, but as a long string of binary digits

(32 binary digits or 32 bits, IP addresses are 32-bit addresses).

The three IP addresses in the example above, written in binary

form are:

1. 11010010.11001010.11001100.11001101

2. 10111101.00010101.11110001.00111000

3. 01111101.01010111.00000000.00000001

The dots are included to make the numbers easier to read.

Eight binary bits are called a ‘byte’ or an ‘octet’. An octet can

represent any decimal value between ‘0’ (00000000) and ‘255’

(11111111). IP addresses, represented in decimal form, are

four numbers whose value is between ‘0’ to ‘255’. The total

range of IP addresses are then:

Lowest possible IP address - 0.0.0.0

Highest possible IP address - 255.255.255.255

To convert decimal numbers to 8-bit binary numbers (and vice-

versa), you can use the following chart:

Binary Octet Digit 2

Decimal Equivalent 128 64 32 16 8 4 2 1

Binary Number

128+64+32+16+8+4+2+1=

255

1 1 1 1 1 1 1 1

Table 5-8. Binary to Decimal Conversion

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 348 349

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D-Link DES-3326S - Switch - Stackable Uživatelská příručka Strana 82