Possible Duplicate:
How Does Domain Know Where Your Web Host Is Located?

I just purchased a domain name from RapidNames, and a hosting plan at JustHost. I was told to enter JustHost's name server (ns1.justhost.com) in my domain name's name server field and wait for 24 hours for the process to be complete. I do not understand how RapidNames can find my account on JustHost's server as I am sure I am not JustHost's only customer.

I have read the article How DNS Works that John Conde has posted, but I still do not understand the issue. After reading several other articles, I am beginning to understand how it works, but I would still like someone to confirm if I am correct or not.

From my understanding, linking your domain name to your web host is a two step process. First, you need to tell your domain name who your web host is. This is done by providing the two DNS server addresses. Secondly, you need to tell your web host which domain names you own by entering your domain names into the domain name manager. As a result, when someone queries your domain name, they will be forwarded to your web host. The web host will look in their database to match the domain name the account's owner, and then serve the appropriate website.

I want to confirm if my understanding of how a domain knows where your web host is located is accurate?