COMPUTER SCIENCE 2K17

1.1 INFORMATION TECHNOLOGY (IT) Definition of IT → The use of computer hardware and software to store, retrieve, and manipulate information. Advantages Of IT To manage finances via online banking  ➜ Use finance software to balance check books, pay bills, track personal income and expenses. ➜ Example : To shop for products and services via online shopping ➜ Shop for product and services via online shopping such as Lazada, Zalora & 11street. Example :       Increase production and save times ➜ IT is used to automate task. Example: Students could use e-mail to send the tasks that their teacher ask to. Disadvantages Of IT Reduces Job Opportunity Technology has replaced  most positions which humans used to occupy. Example : Accounting is now being done by the software Health Risks Improper computer use can lead to injuries of the hands, eyes, elbow ...

2.6.2 Application Software  Definition : A set of programs designed to manage the resources of a computer Types Of Operating System : a) Stand-Alone Operating Systems  Definition : A complete operating system that works on a desktop computer, notebook computer, or mobile computing device. Examples ; Proprietary : UNIX Open Source : Linux  b) Server Operating Systems Definition : Designed specifically to support a network & resides on a server. Examples ; Proprietary : UNIX Open Source : Linux c) Mobile Operating Systems Definition : A mobile operating system resides on a mobile device. Examples ; Proprietary : iPhone OS Open Source :   Google Android

2.5.6 ADAPTER CARD Definition ; A circuit board that enhances functions of the component of a system unit and provides connections to peripherals. Types of Adapter Cards & Its Functions → FireWire Card : Connects to FireWire devices such as video camera. →  Modem Card : Connects other computers other computers through telephone lines. → Network Card : Connects system unit to a cable that connect to other devices on network. → Sound Card : Connects speakers or a microphone. →  USB Card : Connects to USB devices such as speaker & mouse. → Video Card : Connects a monitor. → MIDI Card : Connects musical instruments such as electronic keyboard. → PC-to-TV Converter Card : Connect and display computer output on TV screen. → TV Tuner Card : Allows viewing of television channel on the monitor. Example ;    TV Tuner Card   USB Card     Video Card

3.1.3 NETWORK TOPOLOGY What is network topology?  The layout of the computers and devices in a communications network.   Basics type of network topology ;  ➪  Star Network Topology Example ;  Advantages : If one device fails, only that device is affected. Disadvantages : Network will be malfunctioned single switch break down.   ➪ Bus Network Topology   Example ;  Advantages  : Inexpensive and easy to install. Disadvantages :  Network will be malfunctioned if single central cable break down. ➩ Ring Network Topology Example ; Advantages  : Data packet are flowing in one direction at high speed around the ring. Disadvantages : Network will be malfunctioned if device or cable break down.

WHAT IS COMPUTER ETHICS ? ↪   Computer Ethics are the moral guidelines that govern the use of computers and information systems.                              Areas Of Computer Ethics ; 1. Information Accuracy 2. Green Computing 3.Code Conduct 1. Information Accuracy Definition ; A measure of the reliability of information held within an IT system Explanation ; User should evaluate value of the Web Page before relying on its content.         2. Green Computing Definition ; Involves reducing the electricity and environmental  waste while using a computer. Reason ; i. To stop destroying environment / global warming                ii. Reduce electricity consumption 3. Codes Of Conduct Definition ; A written guideline that helps determine whether a specific computer action is ethical or unet...