Transcript
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.
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
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
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