What are virtual private networks?

Question

What will be an ideal response?

Answer 1

A virtual private network (VPN) is a network that uses a public communications infrastructure (like the Internet) to facilitate private communication between a company LAN and remote employees. Remote employees work from home or are located somewhere other than their workplace. Although they require extra security measures, VPNs provide a relatively inexpensive way to connect remote and mobile users with the company's private network. Very often, businesses want to provide some limited access to their communications infrastructure to nonemployees. This may include business partners, suppliers, vendors, and others who deal with the company but are not employees. The part of the company's network that allows access to these nonemployees is called the extranet, which is accessed over or through the Internet. Conversely, the part of the company's network that allows access to employees is called the intranet, which is completely separate from the Internet. Virtual private networks can be intranet VPNs or extranet VPNs. Alternatives to VPNs include owned or leased lines, which are much more expensive.