10
Stefan Thorvaldsson – [email protected]
Computer networksICT InteraCT for KS3
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.
Stefan Thorvaldsson – [email protected]
Computer networksICT InteraCT for KS3
Key conceptsThe key components
Advantage and disadvantageThe Use of Wi-Fi and Bluetooth
Communication methodsDifferences between LAN and WAN
Stefan Thorvaldsson – [email protected]
Computer networksICT InteraCT for KS3
WANWide Area Network
Covers wide geographical areaIn lot of buildings, countries
or/and citiesUses more expensive links owned by telecommunication companies
More expensive
LANLocal Area Network
Small areaUsually located in the same
buildingUses cable, wire-less usually
owned by organizationLess expensive to build
Networks
Stefan Thorvaldsson – [email protected]
Computer networksICT InteraCT for KS3
Disadvantage
Might need a network managerSecurity problems
VirusesBreakdown problems
Initial costs of equipment
Advantage
You can share printers, scanners, folders, Internet Connection and
moreCentral Back Up
SpeedAccess to central data
Networks
Stefan Thorvaldsson – [email protected]
Computer networksICT InteraCT for KS3
Bus network
Networks
Star network
Tree network
How computers link to each other in a network
Stefan Thorvaldsson – [email protected]
Computer networksICT InteraCT for KS3
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.
Networks
Keywords
NetworkLAN WAN
BandwidthWLAN
Stefan Thorvaldsson – [email protected]
Computer networksICT InteraCT for KS3
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.
Networks
KeywordsISP
WebInternet
Stefan Thorvaldsson – [email protected]
Computer networksICT InteraCT for KS3
Internet related topics
BrowsersURL
wwwHTML
Network relatedtopics
IntranetsBridgesRouters
SwitchesHubs
Proxy servers
Networks
Stefan Thorvaldsson – [email protected]
Computer networksICT InteraCT for KS3
ActivitySearch on the “Web” for information about the topicsThink of advantages and disadvantages in every topic
Do Activity 4.2---------
