VIRTUAL PRIVATE NETWORK

VIRTUAL PRIVATE NETWORK

A VPN is a private network that uses a public network to connect remote sites or users together. Instead of using a dedicated, real-world connection such as leased line. Virtual uses “virtual” connections routed through the Internet from the company private network to the remote site or employees.

Two types of VPN:

Remote access
Site to site


Remote access: It is also called a virtul dial up network. It is a user to LAN connection used by a company that has employees who need to connect to the Private network firm various remote locations. A corporation that wishes to set up a large remote-access VPN will outsource to an enterprise service provider (ESP). The ESP sets up a network access server and provides the remote users with destop client software for their computer. The telecommuters can then dial a toll-free number to each as and use their VPN client software to access the corporate network.
Site to site VPN: Through the use of dedicatedequipment and large-scale encryption, a company can connect multiple fixed sites over a public network such as internet.
Site to site VPNs can be two types:

Intranet
Extranet


Intranet:
An intranet is a network inside an organization that uses Internet technologies such as web browser and servers, TCP/IP network protocol, html hypermedia document publishing and database and so on. It provides an internet like environment within the enterprise for information sharing, communication, collaboration, and the support of business processes.

An intranet is protected by security measures such as password, encryption and firewalls and can be accessed by authorized users through the Internet.

If a company has a one or more remote locations that they wish to join on a single private network. They can create an intranet VPN to connect LAN TO LAN.


Extranet:
Extranet are network links that use internet technologies to interconnect the intranet of a business with intranets of its customers, suppliers, and other business partner. Companies use EXTRANET direct private network links between themselves or create private secure internet links between them. It is also use the unsecured internet as the extranet link between its intranet and consumers and others but rely on encryption of sensitive data and its own firewall system to provide adequate security.

In a company has a Close relationship with another company like partner, suppliers, customers then they can build an extranet VPN that connects LAN To LAN, and that allows all of the various companies to work in a shared environment.