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A Virtual Private Network (VPN) provides end users with a way to privately access information on their network over a public network infrastructure such as internet. Using a technique called "Tunneling", data packets are across a public routed network, such as internet that simulates a point-to-point connection. The basic structure of the virtual circuit is to create a logical path from the source port to the destination port. The authors proposed a new algorithm "Provisioned Restorable algorithm" to achieve better quality of service by combining the provision and restoration algorithms. Their algorithm used to meet the bandwidth requirements specified by customers in virtual private networks.
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