Networks

Networks

1. There are two types of nework, Local Area Network (LAN) and Wide Area Network (WAN).

   • A LAN covers a small area such as one site or building, eg a school or a college.
   • A WAN covers a large geographical area. Most WANs are made from several LANs connected together.

2. Advantages of networks

   • Sharing devices such as printers saves money.
   • Site (software) licences are likely to be cheaper than buying several standalone licences.
   • Files can easily be shared between users.
   • Network users can communicate by email and instant messenger.
   • Security is good - users cannot see other users' files unlike on stand-alone machines.
   • Data is easy to backup as all the data is stored on the file server.

3. Disadvantages of networks

   • Purchasing the network cabling and file servers can be expensive.
   • Managing a large network is complicated, requires training and a network manager usually needs to be employed.
   • If the file server breaks down the files on the file server become inaccessible. Email might still work if it is on a separate server. The computers can still be used but are isolated.
   • Viruses can spread to other computers throughout a computer network.
   • There is a danger of hacking, particularly with wide area networks. Security procedures are needed to prevent such abuse, eg a firewall.

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