Information technology

Basic Information Technology Concept Information technology - the use of

modern technology to aid the capture, storage, retrieval, analysis, and communication of information.

The various methods of delivering information are by the use of data, text, image, and voice for personal or organization needs.

Evolving more rapidly than Industrial AgeWill continue into the current century

Information Age

Cornerstones of our Economy

LandLaborCapitalInformation

Forging a Computer-Based Society:

Jobs

From physical to mental

From muscle-power to brain-power

Forging a Computer-Based Society:

A Computer in Your FutureWhere used?

Bank withdrawalSupermarketDrive the car

Do I need a Personal Computer?Campaign: One Home, One PCMany more use at work

Will I use a computer in my future career?Almost every job will involve use of a computer

Video: Future of Information Technology

How a Computer System Works – cont.

Software- The instructions needed to direct the computer to complete specific tasks.

•The CPU follows the step-by-step instructions in a program to complete the tasks from user.

• Operating system is the system software that controls the basic, low-level hardware operations and file management.

Microcomputers- Also known as personal computers- Physical sizes : palmtop, desktop and tower case- Cheaper and smaller in size

Minicomputer- Also known as departmental computers- Physical sizes : small to large cabinets- Support business application

Computer Configuration and Classification

InternetCollection of networksNo ownershipNo central source for services availableNo comprehensive index of what information

is available

Individuals

Businesses

Organizations

Libraries

Research labs

Government

Connects Everyone!

Getting ConnectedUser’s computer must connect to a server

Server must communicate using TCP/IP

The user can purchase access to a server from an ISP (Internet Service Provider)

Internet – What Can You Do?WWW – World Wide Web

FTP – File Transfer Protocol

E-mail

UseNet

IRC – Internet Relay Chat

Bulletin Boards

World Wide Web• Browser – program that allows the user

to move around and explore the Internet

• Use the mouse to point and click on text and graphics

• Web page

• Web site

• Home page

Classifications of ComputersUse the computer that fits your needsBased upon

SizeSpeedCostPortabilityNumber of simultaneous users supportedAvailable softwareTypical use

Personal ComputersOther names

PCMicrocomputerHome computer

CategoriesLow-end functionalFully poweredWorkstationsNet computer or net box (Web TV)

Desktop Models

Notebook ComputersPortable

LightweightFits in a briefcaseBattery operated

LaptopLargerHeavier

More expensive that desktop models

Handheld ComputersPersonal Digital Assistant (PDA)

SchedulingAddressesHandwritten inputMay offer wireless e-mail and fax

PDA PhoneMore power than PDACellphone, GPS, MP3/MP4, Camera,

Video, TV, Radio etc.Runs various type softwares, serving various

applications

Other Types of ComputersMainframes

High speedMore expensiveUsed to process large amounts of data quicklySupport multiple usersDoes server tasks

SupercomputersFastest speedMost expensive

Network : Computers connected together to communicate among themselves.

Resource Sharing File Sharing Communication PCs’ Administration and Security

- Computer network technology can be classified by the distance the network technology is designed to span

- There are three types of networking :

Local Area Network (LAN)

Metropolitan Area Network (MAN)

Wide Area Network (WAN)

COMPUTER NETWORKING –cont.

Local Area Network (LAN)

- Relatively small refers to the transmission media and computer hardware- The area is not exceeding 10 KM- It only uses one type of transmission medium- It share resources within building or campus

COMPUTER NETWORKING –cont.

Metropolitan Area Network (MAN)

- The network is larger compared to LAN

- The area covers a city of 10 to 100KM

- It requires efficient hardware and transmission media

to cover these areas

COMPUTER NETWORKING –cont.

Wide Area Network (WAN)

- The network is larger than MAN and LAN

- It interconnect LAN of opposite sides of country or around

the world

- It covers huge geographical area in the world

COMPUTER NETWORKING –cont.

Local Area Network

Local Area Network

Router Multiplexer

Multiplexer

Modem

Modem

Front endProcessor

Host Computer

Star

Ring

Bus