Virtual Private Networks
Virtual Private Networks are Private networks running over a shared network infrastructure that allows interconnections between different corporate network sites and remote users. Business critical transactions passed through a VPN are highly secure and, in fact, it appears the same as transferring data on a private network. Virtual Private Networks are significantly less expensive than private networks because they are based on a shared infrastructure and can deploy required quality of service, the prime factor for cost measurement with respect to usage.

Remote Users can connect to the Corporate Network using the encryption software installed on a notebook or desktop machine, secure tunnels are then established between the software and VPN devices at the edge of the corporate network with the help of dynamic reconfiguration. It also has an additional quality of being Ubiquitously accessible.

VPN Challenge?
The biggest challenge for service providers seeking to deploy and deliver large-scale managed Virtual Private Network (VPN) services is end-to-end VPN service management. To be truly effective, a provider's service management solution should support the entire service life cycle, from creating customizable service offerings for customers to activating services and ensuring smooth operation. Fault management issues incase of failure in change of Quality of Service (QoS). Performance management at customer and provider edge devices.