Type of Network

Lan and Wan basically define a way by which devices are interconnected  with each other, and how data route from source to destination  but the level of exchange of information could be understand by discussing, Internet, Intranet, Extranet – What is it? and what is the difference between the internet, intranet, and  extranet?

Internet – inter means between, and net is short for networks, so internet literally means between networks. So what is the internet? The network of networks. The network formed by connecting all of the networks together i.e The "Internet" is a global wide area network that connects computer systems across the world.

Intranet – intra means within and net means network, so intranet means within the network. i.e all system connected together could communicate but they could not go to the internet to anything, i.e if you are accessing the server of school  which is not connected to the internet, then all system connected with the server can communicate with that server utility but could not browse any web page, bank network is the live example of it, they are internally connected but could not browse web page. 

Extranet – extra means in addition to, and net means network, so extranet literally means in addition to the network. An extranet is an area of the network that users who are outside of the network can remotely connect into. This can be done with VPN services, allowing users with permission to VPN into an area of the network.