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Lauren Crowe

on 1 October 2012

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Transcript of NETWORKS.

NETWORKS. WHAT IS A NETWORK? 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. 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, centralize 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 stand alone computer? 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. Advantages

*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 (hmm!) Hackers etc would have to be on the actual machine. The 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 computers *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!) 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. by Lauren Crowe.
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