Virtual Private Network (VPN) is a Closed User Group created for providing backbone connectivity between locations over a Wide Area Network (WAN). VPN replaces the PtP intercity links running between customer locations with a last mile connection (wired/wireless) to the nearest Service Provider's Point of Presence. The backbone between POPs provides a highly redundant, reliable, commercially attractive solution. VPN allows a private intranet configuration to be securely extended across the Internet or other network service, facilitating secure e-commerce and extranet connections with business partners, suppliers and customers.