Summary
Nowadays, much of our data is protected using some form of encryption. A VPN provides a secure tunnel to transmit data over an insecure network. In this chapter, we defined the meaning of a VPN and outlined some examples. We saw how consumers can secure data using OpenVPN or browser-based VPNs. We also saw how network administrators can use an SSH VPN for remote configuration and learned how PuTTY provides an easy method to use SSH on a Windows machine.
We then outlined the elements of an IPsec VPN. We examined the authentication header and discovered the encapsulating security payload, and saw what's involved when selecting an operating mode. We saw the importance of the IKE process and an example of what an administrator might see when setting up an IPsec profile on a device. We then finished up with a discussion of TLS. We saw what happens in both the TLS Record and handshake protocols by covering the handshake, change cipher spec, and alert protocols; and, once...
