VPN Topic One - Answers

VPN

VPN stands for Virtual Private Network. VPN is a communication network which is bridge through another network more securely and in encrypted way. The combination of these terms produces VPN – a private network , where the privacy is introduced by some method of virtualization. A VPN could be built between two end-systems or between two organizations, between several end-systems within a single organization or between multiple organizations across the global Internet, between individual applications, or any combination of the above.
Attractions of VPNs to enterprises include:

• Due to shared facilities, may be cheaper, especially in capital expenditure (CAPEX) than traditional routed networks over dedicated facilities.
• Can rapidly link enterprise offices, as well as small-and-home-office and mobile workers.
• Allow customization of security and quality of service as needed for specific applications
• Especially when provider-provisioned on shared infrastructure, can scale to meet sudden demands
• Reduce operational expenditure (OPEX) by outsourcing support and facilities

Ref :

http://en.wikipedia.org/wiki/Virtual_Private_Network
www.potaroo.net/papers/1998-3-vpn/vpn.pdf