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.
According to a research report published by National Association of Software and Service Companies (NASSCOM), IT-BPO Sector in India: Strategic Review 2010, the IT-BPO industry is estimated to aggregate revenues of US$ 73.1 billion in FY2010, with the IT software and services industry accounting for US$ 63.7 billion of revenues.
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
Internet Collection of networks No ownership No central source for services available No comprehensive index of what information is available Individuals Businesses Organizations Libraries Research labs Government Connects Everyone!
Getting Connected Users 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 Computers Use the computer that fits your needs Based upon Size Speed Cost Portability Number of simultaneous users supported Available software Typical use
Personal Computers Other names PC Microcomputer Home computer Categories Low-end functional Fully powered Workstations Net computer or net box (Web TV) Desktop Models
Notebook Computers Portable Lightweight Fits in a briefcase Battery operated Laptop Larger Heavier More expensive that desktop models
Handheld Computers Personal Digital Assistant (PDA) Scheduling Addresses Handwritten input May offer wireless and fax PDA Phone More power than PDA Cellphone, GPS, MP3/MP4, Camera, Video, TV, Radio etc. Runs various type softwares, serving various applications
Other Types of Computers Mainframes High speed More expensive Used to process large amounts of data quickly Support multiple users Does server tasks Supercomputers Fastest speed Most expensive
COMPUTER NETWORKING 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 RouterMultiplexer Modem Front end Processor Host Computer
Star Ring Bus