The Virtual Private Network (VPN) is one of the best technologies used for communication over the Internet. As the world is more and more getting dependent on the Internet, VPN is growing and making its mark as International and Multinational companies use VPN services as the medium of communication. A VPN has its public telephonic infrastructure and tunnelling protocols for communication. Companies can own their private telephonic lines from the VPN in order to maintain their security to a higher extent. The VPN provides the same resource sharing which telephone companies used to present but...