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Casey Payne

on 1 October 2012

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Transcript of Networks.

By Casey Payne Networks What is a network? A network is a series of interconnected computers,
linked together either via cabling or wirelessly.
Often linked via a central server but can be linked without a central computer. A stand alone computer is a computer which is not connected to a network.
All devices are directly connected to that computer and all data, is stored on each individual machine. What is a stand alone
computer? Advantages! No extra cabling/equipment needed, meaning you only need a computer A virus wouldnt effect other machines Easy to understand. Disadvantages! No hardware sharing. You would have to switch to different machines Software has to be installed on every machine, and it costs money and takes time. Harder to communicate. Advantages! Hardware can be shared - Printers, scanners, file servers, internet routers Communication is improved, for example:
Collaborative working Centralised backup - Removing responsibility of individual people. Disadvantages! A lot of hardware required
E.g. servers, hubs, switches, wiring, wireless routers. Security - Viruses can potentially affect an ENTIRE network. Hackers could compromise a whole system. Upgrading - Upgrading cabling and machines on a mass scale is expensive. What is a LAN? What is a WAN? A LAN - Local Area Network, is made up of two or more computers connected together in a small area. A WAN, or wide area network, is a computer network that spans a large area. Topology Topologies - Network topology is the arrangement of the various elements. 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.
Security problem!
To add a new client, the whole network must be switched off.
Backup issues
A break in the line causes whole network failure.
Ring Topology
Full transcript