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Laura Rose Whiston

on 23 April 2013

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Transcript of Networks

Networks So 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. It is a computer which is not connected to a network (i.e. other machines or a central server). What is a stand alone computer? All devices are directly connected to that computer and all data (software and information), is stored on each individual machine. Both networking and stand alone computing have advantages and disadvantages and depend upon the situation. Advantages of networks Hardware can be shared. (Printers, scanners, file servers, internet routers).
Providing cost savings. Shared data. Information can be stored centralised (e.g. a shop database of
products). More accurate data. Also easier to get information to
people in different places. Improved communication. E-Mail, Intranets and Collaborative working. Shared software. Network licenses for software is often cheaper than individual licenses.
Networks: software can be deployed or hosted on an applications server
and downloaded on-demand. Improved, centralised security. Logons, access levels. Centralised backup. Removing responsibility of individual people. Disadvantages of networks A lot of hardware required. E.g. servers, hubs, switches, wiring, wireless routers.
A lot of technical expertise requires. Reliability and performance. High network traffic , could cause slow down. Central server failure could cause whole network to die. 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? 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 WAN? Wide Area Network. A series of interconnected computers over more than one physical site (area, town, city or even country!)
Connected with a range of technologies such as phone lines, satellite links, broadband, physical fibre optic link. The different types of
which exist.
WAN and LAN 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. + Central Backup
+ Network stays active if one line breaks.
+ Easy to expand
+ Fewer security problems due to central control.
+ High performance. Each client has its own cable. Bus Topology Cheap to install. Only one cable needed.
Straightforward and easy to install.
Extra computers can be added easily.
No central server.
Data sent to every machine (security issues).
Backup issues.
Network down if main cable is damaged. + Fast transmission.
+ Easy to set up and install
+ New clients can be added easily 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. + Very fast transmission rates.
+ Not dependent on single server
+ Cheap to install (no server, no major
cabling). Advantages of stand alone. Fewer Hardware requirements.
No extra cabling or equipment needed.
Just a PC! Reliability and Performance. Not effected by network traffic.
Performance should stay relatively the same. Security. A virus would not effect other machines.
Hackers etc would have to be on the actual machine.
he machine can be locked away! Little ICT Knowledge Required. No complex understanding of networks etc is required for a stand alone system. Disadvantages of stand alone. No hardware sharing. You would have to switch to different
machines (taking your data with you), to use different hardware
(e.g. if a scanner was on another computer Software installed on every machine. Costly and Timely! Individual Backups. Each person would be responsible for backing up
data on their machine. Imagine the duplication of data in a business! Harder to communicate. No real electronic means to communicate
(unless they all had a separate connection to the internet – again, costly!) “ The real or logical arrangement of elements on a network”
“How a network is laid out”

They can be organised in many different ways. Each have their own advantages and disadvantages. Topologies By Laura Whiston
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