I am a little confused regarding nameserver ordering.

When registering a domain name I understand two nameservers are required.

I have been registering the namerserver of my dedicated server as the first and the nameserver of the domain registration (which only parks the domain) as the second.

How do the nameserver allocations work? Is the first nameserver tried first and only if it doesn't respond does it go onto the second. Or are they both tried simultaneously and the first to respond wins.

The reason I ask is I recently leased a dedicated server and have set up two websites. One I can browse to the other I can't all I get is the domain registration parking page. I set the DNS settings in plesk the same for both. I later realised for the one that works I had misspelled the second nameserver for the domain to something that doesn't exist, yet this one shows the web page, the one I spelled correctly doesn't.

I am fairly new to administering a dedicated server (I am a programmer mainly) and the people I am hosting from give one line answers that are not easy to understand, so any help appreciated.

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