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Networks.

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by

Chloe Taylor

on 23 April 2013

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Transcript of Networks.

By Chloe Taylor. Networks. A network is a series of interconnected computers, that are linked together either via a cable or wireless.
It is often linked via a central server but can be linked without a central computer. What is a network? A stand alone computer is a computer that 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? There are many advantages of a network here are a few;
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.)
Improved communication (Emal, intranets and collaboartive writing.)
Shared software (Network licenses for software is often cheaper than individual licenses)
Improved centralised security. (Logons, access levels.)
Centralised backup (Removing responsibility of individual people.) Advantages of a network. There are quite a few disadvantages of a network here they are;
A lot of hardware is required. (E.g. servers, hubs, switches, wiring, wireless routers.)
Reliability and performance. (High network traffic, could cause things to 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.) Disadvantages of a network There are a few advantages of a stand alone computer here is a list of them;
Fewer hardware requirements. (No extra wiring or cabling required, just a PC needed.)
Reliability and performance (Its not effected by network traffic. Performance should stay relatively the same.)
Security (A virus would not effect other machines. Hackers 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.) Advantages of a stand alone. There are a few disadvantages of a stand alone computer, here is the list of them;
No hardware sharing (You would have to switch to different machines to use different hardwares.)
Software installed on every machine. (Costs alot and takes up alot of time!)
Individual backups (Each person would be responsibile for backing up data on their machine.)
Harder to communicate (No real electronic means to communicate , unless they all had a seperate connection to the internet, which would cost alot!) Disadvantages of a stand alone. What is a LAN? LAN stands for Loacl Area Network.
A LAN is a computer network that interconnects a series of computers in a limited area such as a home, school, computer laboratory or office buildings using network media.
They are usually connected with a mix of cables and wireless technologies. WAN stands for Wide Area Network.
A WAN is a series of interconnected computers over more than one physical site.
They are connected with a range of technologies such as phone lines, satellite links, broadband, physical fibre optic link.
The internet is the most popular WAN, and is used by businesses , governments, individual consumers and numerous others for almost any purpose imaginable. What is a WAN? Topology Each computer is connected to a central server. Star Topology. The server has a high specification on the PC. Everything goes through the central server. Theres a huge dependance on the central server. Central Backup. The network stays active if online breaks. Its easy to expand. There are fewer security problems due to central control. It has a high perfomance and each client has its own cable. All computers are connected to one closed loop. Ring topology There is no main computer. Communication happens by passing data around the ring. All data passes through all computers,not much security!! To add a new client, the whole network must be switched off. Backup issues. A break in the line causes the whole network to fail. Very fast transmission rates. Not dependant on a single server. Its cheap to install. Its Cheap to install. Bus Topology Only one cable is needed. It is straightforward and easy to install. Extra computers can be added easily. No central server. Data is sent to every machine, this is a security issue. Backup issues. Network down if main cable is damaged. It has fast transmission. It is easy to set up and install. New clients can be added easily.
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