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This powerpoint is about networks. It's about what they are, how they work and everything to do with them.

Melissa Williams

on 1 October 2012

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Transcript of Networks

Networks A network is a series of interconnected computers, linked together either via cabling or wirelessly.
A network is often linked via central computers but can be linked without a central computer. What is a network?. A stand alone computer is a compute that is not connected to a network for example other machines or a central server.
All devices are directly connected to a stand alone computer and all data. software and information is stored in each individual machine. What is a stand alone computer? --Hard ware can be shared( for example printers, scanners, internet routers and files servers.
-- Shared data, for example information can be centralized in shop data bases of products. It's also easier to get information to people in different places.
-- It also has improved communication, i.e E-mail, Internets and collaborative working.
-- Shared software. The network licenses for software is often cheaper than individual licenses.
-- Networks also have improved centralized security.
-- The final advantage is that networks give you centralized backup, which removes a responsibility of an individual person. Advantages of networks. -- There's a lot of hardware required. e.g servers, hubs, switching , wiring and wireless routers etc.
-- High network traffic which would cause it to slow down, and if it does down it could cause the whole network to shut down.
-- viruses could be caused and hackers could hack into your network.
--upgrading can also be very expensive. Disadvantages of Networks --There's fewer Hardware requirements which means there's no extra cabling or equipment needed, just your computer.

--Stand alone's are not affected by network traffic,so performance should stay the same.

-- Viruses wouldn't effect other machines, and hackers would have to be on the actual machine.

-- With the stand alone's very little ICT knowledge is needed which means there's no complex understanding Advantages of stand alone. -- The first disadvantage with Stand alone is that there's no hardware sharing, you would have to switch to different machines.

-- if you install stand alone then it would take time as it's timely and it would cost money as it's quite expensive.

-- it's also harder to communicate as there's no real electronic means to actually communicate unless they all had separate connection to the internet, which again is very costly. Disadvantages of a Stand alone. What is LAN? LAN or Local Area Network ,
is a series of interconnected computer restricted to one site.
LAN is usually connected with a mix of cables and wireless technologies. What is WAN? WAN or wide area network, is a series of interconnected computers over more than a physical site . Topology is the real or logical arrangement of elements, or it is how a network is laid out.
Topologies can be organised in many different ways, each of which have their own advantages and disadvantages. What is Topology? Ring Topology.

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. Bus Topology is cheap to install and you only need one cable.
it's also straight forward and very easy to install. There is also no central server, so less hassle.
However if the main cable is damaged the network would be down. Bus Topology
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