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Networks LAN = Local Area Network.

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Networks LAN = Local Area Network. When PCs close to one another in a single office or building are joined by a cable, a network is formed known as a Local Area Network (LAN). Once the computers are connected together into a LAN, many people (users) can share and use the same resources at the same time. They can share files, software, hard disks and peripherals such as a printer or CD-ROM. Users can also use the LAN to communicate with each other by e-mail. Data can be transmitted very quickly between networked computers. Advantages of Networks * Programs can be shared- software packages can be installed onto the file server and accessed by all individual workstations at the same time. ...read more.


The only other person who can access these files is the 'system administrator' who looks after the network. Disadvantages of Networks * Networks can be expensive to set up. They often involve taking up floors and ceilings to lay hundreds of metres of cables. * The File Server needs to be a powerful computer, which often means that it is expensive. * Networks are vulnerable to security problems. Hackers, disgruntled employees or even competitors might try to break into the system to read or damage crucial information. Much effort is spent preventing unauthorised access to data and software. * If the main File Server breaks down, then the whole system becomes useless and no-one can carry on working. ...read more.


Disadvantage If a single machine is switched off then the network does not work. If the cable breaks, once again, the network does not work. Bus This is the simplest way to connect workstations, servers and other components of a network by using a single cable. One or more of the workstations act as the File Server, whilst the other machines are used as workstations or terminals. Advantage Easy to install Very cheap Disadvantage If many workstations are using the network at the same time, response can be very slow, thus frustrating users who want to work quickly. The technical term for data trying to travel simultaneously along the cable in different directions is called 'data collision'. A busy network will have many data collisions. If there is a problem with the cable, the entire network stops working. ?? ?? ?? ?? ...read more.

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