Aditya Abeysinghe Networking

The problem with general communication methods- Businesses had to historically dedicate on leased dedicated circuits such as T1, ISDN and OC3. Although these methods provide reliable private secure methods, these lines are expensive and often rise in cost as the distance between offices increase. Fig 1 : Leased lines What is VPN? VPNs (Virtual Private Networks) are type of point-to-point connections across a private or public network. VPNs use a tunneling process to secure data while transferring data through insecure medium like the internet.&nbsp When a message to be sent is composed and submitted for sending through an insecure medium, a virtual envelope is created around the data, thus securing what is inside the message from the outsiders. Then a virtual tunnel is created for routing between different ports by which the message is sent across. See figure below for more details. Tunneling- The process- Tunneling is the process o...