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Comparing, Designing, and Deploying VPNs lists for about $80.
The cover declares that it is a “practical guide” for comparing such things as IPsec, MPLS Layer 3, L2TP (versions 2 and 3), AtoM, and SSL virtual private networks. What makes it a practical guide is that almost every chapter begins with a Benefits and Drawbacks section for the technology being discussed and immediately lets you know whether you should consider this or not. I found this approach extremely helpful and appreciated having that information at the beginning of the chapter.
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