The Internet, which facilitates
communications between computers all over the world, and access to data and applications at geographically scattered sites (including the World Wide Web)
* Intranets, which make information readily visible via a browser to users of a LAN or WAN, such as within a single corporation
* Extranets, which share data between users within a group of companies, for example a supplier may create an Extranet with its major customers to facilitate sharing of information
* Private networks: LANs and WANs where data is shared and e-mails are exchanged between members of a single organisation
* Virtual Private Networks (VPNs) where remote users can be given access rights to make a dial-in connection via modem to the resources of a private network (usually protected by encryption).
The wide use of TCP/IP means that you will need to understand the essentials of this group of protocols when installing and
maintaining networked machines.