What is a VPN?

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A VPN, or Virtual Private Network, is a private network that uses a public network (usually the Internet) to connect remote sites or users together.

Many organizations create their own VPNs  to accommodate the needs of remote employees and distant offices.

Instead of using a dedicated, real-world connection, such as leased line, a VPN uses "virtual" connections routed through the Internet from the company's private network to the remote site or employee. There are two common types of VPNs: Remote-Access and Site-to-Site.




Security is one the most important aspect of the VPN you need to know. IPsec is the  traditional choice for implementing VPN security at the layer 3 of the OSI 7-layer interconnection stack. Other alternative is SSL VPN through the application layer applications such as a web browser..