Network types and topologies
A network is a number of computers linked together to allow the sharing of resources. A server usually provides services like file storage and email.
LANs and WANs
There are two main types of network:
- Local Area Network (LAN)
- Wide Area Network (WAN)
LAN
A LAN covers a small area such as one site or building, eg a school or a college.
WAN
A WAN covers a large geographical area. Most WANs are made from several LANs connected together.
- The internet is a WAN.
- A network of bank cash dispensers is a WAN.
- A school network is usually a LAN.
- LANs are often connected to WANs, for example a school network could be connected to the internet.
- WANs can be connected together using the internet, leased lines or satellite links.