This paper focuses on this particular type of VPN. First, it provides a short history on the evolution of VPNs, then it explains what is meant by Network based VPNs. To best present this concept, I will use a standard company network for which a CPE and a Network Based Solution is proposed and I will compare the 2 alternatives. Such an approach will allow identifying the differences in design and addressing some fundamental pre-requisites for the implementation of Network Based VPNs. I will review some important security issues to address when an ISP deploys such IP Service Switches. To finish up, we will be giving a list of the major PROs and CONs of Network Based VPNs.
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