5.5. Summary

In this chapter, we agreed on a definition of VPN and acknowledged that even with our definition, there can still be disagreement about whether a particular technology is a VPN or merely a secure application. We saw how this definition applies to PPTP and L2TP and examined the extent to which those protocols provide a robust VPN.

We ended the chapter by providing a road map for the rest of Part 2. We indicated that we will study SSL, SSH, and four lightweight VPNs.