Simplified example of how DNS works

Here is just a brief and simpliefied example of how DNS works

How to use NSLOOKUP 

nslookup

Note that you may have to give the full pathname. Under SunOS, nslookup lives in the /usr/etc directory; under Ultrix, in /usr/ucb ; and under HP-UX, in /usr/bin .

Once nslookup is running, it prints the name of your default name server and the IP address for that machine, then a > character as a prompt and awaits input:

Server:  Your.Main.Server
Address:  123.45.67.8
>

In Part 2 of this article series, I walked you through the process of installing an Enterprise Certificate Authority that was to be used by a VPN Server. In this article, I will continue the discussion by showing you how to configure the necessary VPN Server. For the purposes of this article series, I will be installing the Network Policy Server onto the same physical computer as will be used for the VPN Server. In a real world deployment, you would usually want to use two separate computers to host these roles. Hosting both roles on the same computer should only be done in a lab environment.