1. Stefan Thorvaldsson – stefan@ywies.com

2. What is a network? A network is two or more computer linked together so the are able to share resources. It could be a printer, scanner, folder, software or even a connection to the Internet. You can also share data using a network. For example, a database could be accessed from any of the computers connected to the network.

3. Stefan Thorvaldsson – stefan@ywies.com Key concepts The key components Advantage and disadvantage The Use of Wi-Fi and Bluetooth Communication methods Differences between LAN and WAN

4. Stefan Thorvaldsson – stefan@ywies.com WAN Wide Area Network Covers wide geographical area In lot of buildings, countries or/and cities Uses more expensive links owned by telecommunication companies More expensive LAN Local Area Network Small area Usually located in the same building Uses cable, wire-less usually owned by organization Less expensive to build

5. Stefan Thorvaldsson – stefan@ywies.com Disadvantage Might need a network manager Security problems Viruses Breakdown problems Initial costs of equipment Disadvantage Might need a network manager Security problems Viruses Breakdown problems Initial costs of equipment Advantage You can share printers, scanners, folders, Internet Connection and more Central Back Up Speed Access to central data Advantage You can share printers, scanners, folders, Internet Connection and more Central Back Up Speed Access to central data

6. Stefan Thorvaldsson – stefan@ywies.com Bus network Star network Tree network How computers link to each other in a network

7. Stefan Thorvaldsson – stefan@ywies.com Wi-fi Enables computers and other devices to communicate wirelessly with each other. Most known as get connected to the Internet. Bluetooth Is a wireless technology to exchange data over a short distance. Can be used up to 100m depending on the strenght of the signal. Network LAN WAN Bandwidth WLAN

8. Stefan Thorvaldsson – stefan@ywies.com Internet A huge group of networks working together. Each network consists a lot of smaller networks. Connected to the Internet you’re a part of the largest network in the world. ISP Web Internet

9. Stefan Thorvaldsson – stefan@ywies.com Internet related topics Browsers URL www HTML Internet related topics Browsers URL www HTML Network related topics IntranetsBridgesRoutersSwitchesHubs Proxy servers Network related topics IntranetsBridgesRoutersSwitchesHubs Proxy servers

10. Stefan Thorvaldsson – stefan@ywies.com Activity Search on the “Web” for information about the topics Think of advantages and disadvantages in every topic Activity 4.2 Do Activity 4.2 ---------Activity Search on the “Web” for information about the topics Think of advantages and disadvantages in every topic Activity 4.2 Do Activity 4.2 ---------