This chapter provides a very detailed overview of VPNs, with a focus on using IPSec as a VPN technology. It started by covering the various use cases for VPN and available options. It then covered the technicalities of different VPN protocols, such as PPTP, L2TP, SSTP, IPsec, and the components that make up IPSec.
The middle section of this chapter covered the design principle of corporate remote access VPNs by looking at full and split tunnel options and their benefits. The chapter finished by looking at WAN encryption techniques, from Enterprise to cloud services and financial organizations, in order to ensure security on different layers of the data communication model.
Now that you have a basic knowledge of all layers from network to application security, the next chapter will look at an overall approach to infrastructure security and future technology.
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