Introduction to Computers , 7 /e, McGraw-Hill Reference Book:

Full text

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INTRODUCTION TO

COMMUNICATION

TECHNOLOGIES (ICT)

LECTURE 1 : WEEK 1

CSC-111-T

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TEXT AND REF. BOOKS

2

 

Text Book:

 Peter Norton (2011), Introduction to Computers, 7 /e, McGraw-Hill

 

Reference Book:

 Gary B (2012), Discovering Computers, 1/e, South Western

 Deborah (2013), Understanding Computers, 14/e, Cengage Learning

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MOBILE ALERT

Kindly

Switch Off

your Mobile/Cell Phone

OR

Switch it to

Silent Mode

Please

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COURSE ASSESSMENT

4

Home/Assignment --- 20%

Quizzes --- 10%

Mid Term

--- 20%

Lab --- 50%

Final --- 50%

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GOOGLE SITE ADDRESS

FOR LECTURE NOTES AND STUDY MATERIAL

DOWNLOAD,

PLEASE VISIT :

https://sites.google.com/site/shucsc110/csc-110-theory

FOR TYPING PRACTICE :

http://www.sense-lang.org/typing/tutor/keyboarding.php

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GRADING

Letter Grade

Percentage

Grade Point

A (Outstanding)

87 - 100

4.0

B+ (Very Good)

80 - 86

3.5

B (Above Average)

72 - 79

3.0

C+ (Satisfactory)

66 - 71

2.5

C (Barely Acceptable) 60 - 65

2.0

D (Poor)

50 - 59

1.5

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Presented by: Ms. Naureen Farhan

COMPUTERS,

INTERNET & WORLD

WIDE WEB

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LEARNING OUTCOME

Computer Defined

Types Of Computer

Internet

The Internet’s Major Services

The World Wide Web

Understanding the World Wide Web

Understanding the HTTP

Understanding the URL

Using your browser and the World Wide Web

Searching the Web

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What Is A Computer…

An Electronic device

Converts data into information

Modern computers are digital

Two digits combine to make data

Older computers were analog

A range of values made data

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Advantages

Speed

Reliability

Consistency

Storage

Communications

Disadvantages

Violation of

Privacy

Impact on Labor

Force

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Types Based On Principal Of

Operation

There are three different types of computers according to the principles of operation. Those three types of computers are

Analog Computers

Analog Computer is a computing device that works on continuous range of values. 

Digital Computers

Digital computer operates on binary number system in which there are only two digits 0 and 1. Each one is called a bit.

Hybrid Computers

A hybrid computer combines the desirable features of analog and digital computers.

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Types Based On Configuration

There are four different types of computers when

we classify them based on their performance and

capacity

Super Computers

Mainframe Computers

Mini Computers

Micro Computers

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Types Based On Configuration

Super Computers

The best in terms of processing capacity and also the most expensive ones. These computers can process billions of instructions per second. Used for applications which require intensive numerical computations such as stock analysis, weather forecasting etc.

 Ex: China's Tianhe-2, Blue Gene

Mainframe Computers

Mainframe computers can also process data at very high speeds i.e., hundreds of million instructions per second and they are also quite expensive. Normally, they are used in banking, airlines and railways etc

Ex: IBM System z9 

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Types Based On Configuration

Mini Computers

Mini computers are lower to mainframe computers in terms of speed and storage capacity. They are also less expensive than mainframe computers. Some of the features of mainframes will not be available in mini computers.

Micro Computers

The invention of microprocessor (single chip CPU) gave birth to the much cheaper micro computers i.e.

Desktop

Workstations

 Laptop/Notebook

 Hand Held (PDA’s) etc

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What Is Internet

A global computer network providing a

variety of information and communication facilities, consisting of interconnected networks using standardized communication protocols.

The vast collection of computer

networks which form and act as a single huge network for transport of data and messages across distances which can be anywhere from the same office to anywhere in the world.

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Why use the Internet?

Apply for jobs or schools

Fill out government forms

Check bank accounts

Communicate with family, friends

and co-workers

Do research

Learn new skills

Read news

Watch videos

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How to connect to the

Internet

Three main ways to connect to the

Internet

Dial-Up (Old/outdated)

High Speed/DSL

Wireless Connection (Wi-Fi)

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Dial-Up Internet Connection

Dial-Up

All you need is a computer, phone-line and Internet Service

Provider! (ISP)

Not as fast as other Internet connections,

but often more affordable

ISP

Internet

Your computer

Landline

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High Speed (Cable/DSL) Connection

Travels through fiber-optic cables

underground

Needs to be connected by a Modem

to your computer

Modem: A hub that connects

the computer to the Internet

Faster than Dial-up

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Wireless Internet Connection

(Wi-Fi)

Your computer must be a

“Wireless enabled” device

Your computer can pick up

signals from different

wireless networks

Some networks require

passwords or a

subscription, others are

free

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World Wide Web (WWW)

Tim Berners-Lee and others at the

European Laboratory for Particle Physics,

more popularly known as CERN, proposed

a new protocol for information distribution

in 1991 based on hypertext

Hypertext is a system of embedding links in

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Today and the Future

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100,000 new web sites per month

More than 75% of U.S. households online

Access is available world wide

Concepts of E-economy, E-world

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Internet Growth

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The Internet’s Major Services

The World Wide Web (WWW)

Developed in 1993 by

Tim-Berners Lee

Allowed connection of documents

Required a browser to read

documents

Electronic mail (e-mail)

Instantaneous transmission of

documents

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The Internet’s Major Services

News

Often called newsgroups

Electronic discussions on several topics

File Transfer Protocol (FTP)

Sends and receives files

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The Internet’s Major Services

Chat

Public real time conversation

Instant messaging

Private real time conversation

Peer-to-peer services

Allows sharing of files among users

Illegal to share copyrighted material

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World Wide Web (WWW)

T h e

Wo r l d W i d e We b

i s s y s t e m o f

I n t e rn e t s e r v e r s t h a t s u p p o r t s p e c i a l l y

f o rm a t t e d d o c u m e n t s .

The documents are formatted in a markup

language called 

HTML (HyperText Markup

Language)

that supports links to other

documents, as well as graphics, audio, and

video files.

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World Wide Web : Major Parts

The World Web is based on these

technologies:

HTML - Hypertext Markup Language

HTTP - Hypertext Transfer Protocol

Web servers and Web browsers

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WWW

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HyperText Transfer Protocol

(HTTP)

HTTP is the underlying protocol used by the World Wide Web

HTTP defines how messages are formatted and transmitted,

and what actions Web servers and browsers should take in

response to various commands

HTTP is called a 

stateless

 protocol because each command is

executed independently

The three main HTTP message types are GET, POST, and HEAD

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Uniform Resource Locator

(URL)

URL is the global address of documents and

other resources on

the World

Wide

Web

The first part of the URL is called a 

protocol

identifier

,

 and the second part is called

R

esource name

 and it specifies the 

IP

address or

the 

domain

name

 where

the

resource is located.

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URL Explained

http://

www

.

google

.com

/

index.html

Protocol

Sub domain

Domain Name

Resource Name

Top level domain

File Path/Name

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Understanding The Internet

web browser

  is a software application for

retrieving and

presenting information resources

on

the World Wide Web

OR

  Browser is a software application used to locate,

retrieve and display content on the World Wide Web,

including Web pages, images, video and other files.

Read and translate the HTML

Display web content

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Famous Browsers

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Search Techniques

Quote the exact phrase

Use the keyword AND

Use the keyword NEAR

Avoid common words

Use the site’s advanced tools

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Search Engine Market Share

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Any Questions !!!

END OF LECTURE

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