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While many VPN formats exist, only one appears to have the full backing of the IETF, OS developers, and major networking vendors. The above features are components in the IP Security Protocol (IPSec) Standard. Evidence of its adoption appears in the IP Version 6 specification and in its own RFCs. VPNs have wide applicability. In business application, the heaviest usage for VPN technology today is to address three primary needs:
Network managers and planners face several hurdles in VPN implementation. They must decide where VPNs will be used and does the size of the solution cost effectively fit the requirements of the location. In other words, how do you build a scalable VPN such as the illustration below? IPSec VPN Network
VPN creates a private means for communications between geographically distributed locations
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