Explain Internet, intranet, extranet VPN and VAN?
An intranet is an implementation of Internet technologies usually restricted to within corporate sites, but which may operate over a wide area network. An extranet is a further extension of such restriction to approved clients, customers or associates for the purpose of exchanging confidential information or transactions. A VPN (virtual private network) is the network application for implementing an extranet or wide area intranet. A VAN (value added network), is essentially a proprietary network over which EDI, EFTPOS or other financial transactions are implemented. Firewall and encryption technologies are important in securing all of these networks, particularly over the external communications infrastructure.
