Virtual private networks (VPNs) in their many and varied guises are becoming more and more prevalent throughout the world. For the service provider and enterprise, they provide a means of enabling new services and applications over a wide-area network (WAN), while providing considerable concomitant cost savings.

VPNs are complex, so when things go wrong, they can be difficult to troubleshoot. What are your options? One option is to contact Cisco TAC. Alternatively, you can buy this book, roll up your sleeves, and get to work. Armed with as much information as I could cram into 800-odd pages, you'll be well on your way to solving your problem. And if your organization is considering deploying or optimizing a VPN and wants to avoid ...

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