is this a test pj123?
The answer is very complex, and involves the way that DNS servers work. The concept of a recursive chain is of interest to hackers, and those who try to stop them, and relates to the way that servers check forward with the next server in a chain when handling TCP/IP requests. A hacker is able to fool the next server into thinking that it's handling a request from you, when in fact it isn't.
It's all a lot more involved than that, and is generally less interesting than watching concrete set, but if you really want to know more