Internal networks
Usually referred to as a local area network (LAN), this involves linking a number of hardware items (input and output devices plus computer processing) together within an office or building.
The aim of a LAN is to be able to share hardware facilities such as printers or scanners, software applications and data. This type of network is invaluable in the office environment where colleagues need to have access to common data or programmes.
External networks
Often you need to communicate with someone outside your internal network, in this case you will need to be part of a Wide Area Network (WAN). The Internet is the ultimate WAN - it is a vast network of networks.
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