I’ve mentioned, in the last few sections, that VPNs can be used to deal with certain kinds of attacks. Therefore, the question is: What is a virtual private network (VPN)? Having worked in the computer field for almost twenty years, I am constantly asked to explain various technologies and what they are used for. In security, the most common question I’m asked is “What’s a VPN?” I’ve probably seen all possible explanations of what a VPN is, such as the following:
It’s an encrypted tunnel.
It uses IPsec, GRE, PPTP, SSL, L2TP, or MPLS (described later in the chapter).
It encrypts data.
It protects traffic across the Internet.
It protects your data from hackers and attacks.
As you can see, many people have different views or perceptions ...