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Transcript of NETWORKS
They are often linked via a central server but can be linked without a central computer. What is a Network? A computer which is not connected to a network (i.e. other machines or a central server).
All devices are directly connected to that computer and all data (software and information), is stored on each individual machine. What is a stand alone computer?
Hardware can be shared
Data can be stored
Improved centralised security
Centralised backup Advantages of Networks Fewer hardware requirements
Reliability and performance
Little ICT knowledge needed Advantages of Stand Alones A lot of hardware is required
Have to have a reliable central server
Upgrading is expensive Disadvantages of networks No hardware sharing
Software installed on every machine
Harder to communicate Disadvantages of Stand Alones LAN stands for Local Area Network.
A series of interconnected
computers restricted to one site.
Usually connected with a mix of cables and wireless technologies. What is a LAN? LAN WAN stands for Wide Area Network.
A series of interconnected computers over more than one physical site.
Connected with a range of technologies such as phone lines, satellite links, broadband, physical fibre optic link. What is a WAN? WAN Info on LAN LAN is based in Schools and small businesses such as self-employed or restaurants. WAN is based in big businesses and offices. Info on WAN Star Topology Each computer connected to a central server.
Server is a high specification PC.
Everything goes through the central server.
Huge dependence on central server. All connected to one closed loop.
No main computer.
Communication happens by passing data around the ring.
All data passes through all computers. Ring Topology Cheap to install. Only one cable needed.
Straightforward and easy to install.
Extra computers can be added easily.
No central server. Bus Topology