Defining Data Communication Systems

LAN, WAN & Internet

Types of communication systems

Network systems

Data Communication Systems


A Local Area Network (LAN) is a system whereby one grouping or one building is connected together via a single connection, these computers cannot speak to a computer outside the network and are limited to a geographical area.


Wide Area Networks (WAN) cover large geographical areas while it is similar in a lot of ways to the internet being able to cover large distances however the computers still are networked together.


Internet Service Providers (ISP, NSP) use more commonly telephone lines to connect the computers through the internet, this is done by connecting to the Network Service Provider which usually works in conjunction with companies like Sky, Virgin Media, BT (ISP’s).