# m01 - Module 1 Introduction to Internetworking By Dr Percy...

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2 Computing Measurement Terms Bits are binary digits. They are either 0s or 1s. In a computer, they are represented by On/Off switches or the presence or absence of electrical charges, light pulses, or radio waves.
3 Computing Measurement Terms

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4 Base 10 (Decimal) Number System
5 Base 10 (Decimal) Calculations Should be familiar because you’ve used it since childhood Example: the number 235 = (2 x 100) + (3 x 10) + (5 x 1) Because you’ve used it so long, you probably don’t think about it

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6 Base 2 (Binary) Numbers
7 Base 2 (Binary) Numbers Binary uses just two digits, 0 and 1 Similar to Base 10; differences are in the details Example: the binary number 11101011 is equivalent to the decimal number 235 – Add the decimal value of each bit to get the decimal number (1 * 128) + (1 * 64) + (1 * 32) + (0 * 16) + (1 * 8) + (0 * 4) + (1 * 2) + (1 * 1) = 235 decimal 1

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8 Four-Octet Dotted-decimal Representation of 32-Bit Binary Numbers Split the binary number into four groups of eight binary digits. Then convert each group of eight bits, also known as an octet into its decimal equivalent.
9 Converting IP Addresses Between Decimal and Binary IP addresses are 32-bit binary numbers Humans find it easier to read decimal numbers, so IP addresses are often expressed in dotted-decimal format Each decimal number represents 8 binary digits, also know as an “octet” Each octet can be converted to a decimal number between 0 and 255, inclusive

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10 Converting Decimal to Binary Start by dividing the decimal by the largest number in the Value row that will go.
11 Converting 8-bit Binary Numbers to Decimal Numbers

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12 Converting 8-Bit Binary to Decimal Binary numbers are converted to decimal numbers by multiplying the binary digits by the base number of the system, which is base 2, and raised to the exponent of its position.

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## This note was uploaded on 12/22/2010 for the course ISOM ISOM235 taught by Professor Percy during the Spring '10 term at HKUST.

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m01 - Module 1 Introduction to Internetworking By Dr Percy...

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