Data Networks

Data Networks

1. A Network is two or more computers, or other electronic devices connected toegther so that they can exchange data, share hardware and software

   • A Local Area Network (LAN) is one that has two or more machines connected within a fairly close geographical area e.g. used in school or small businesses
   • A Wide Area Network (WAN) allows widely dispersed computers to be connected as a single network, it may cover a number of offices within a business

2. Standalone Computers- a computer that is not connected to a network

   • Advantages
     • A user can log on to a computer anywhere on the network and access their work files from the file server
       • Sharing printers, modems etc saves time and money
         • Security- Network managers can allocate usernames and passwords to all users to prevent unauthorised access
   • Disadvantages
     • Takes a long time to install software application on each computer one at a time
       • Users may use up too much storage, causing problems in the network
         • Users may use too much bandwidth e.g. watching videos, preventing others from using the network facilities properly

3. Networked Computers

   • Advantages
     • Flexible access, files can be accessed from any computer throughout the school
       • Resources such as printers and modems can be shared