Abstract:
A Virtual Private Network (VPN) is a packet switching network technology that creates a secure network connection over a public network such as the Internet or a private network owned by a service provider. Large corporations, educational institutions, and government agencies use VPN technology to enable remote users to securely connect to a private network.
Quality of service is one of the important issues for this type of service in order to offer different classes of service for data transfer since it is carried over public, shared network.
VPN service is implemented via various technologies with different Quality of service and security aspects; the most well known technologies are (FR) Frame Relay, ATM (Asynchronous Transfer Mode) and the latest technology is MPLS (Multi-Protocols Label Switching).
This thesis studies and compares the different VPN models, technologies that provide this service, and the required Quality of Service parameters to guarantee the class of service for critical data transfer through the public network.
Sudanese Banks connectivity with their Branches and Central Electronic Banking System is taken as a case-study and recommendations to improve this important connectivity are made.
