Are Name Servers looked up in the order that you put them in?

I have a company that is interested in hosting a backup site with us. They host their own site with their own name servers. They want to put a backup site on my servers in case their web and name servers go down. Additionally they only want the backup site to be called if the main site is down.

My plan is to just setup the account like normal and have them add my nameservers as third and fourth name servers with their registrar.

1) Will this accomplish what I need?

2) Will the name server lookup occur in the order that they are assigned to the domain name.

3) In the event that their web server goes down, will they have to down their name servers for this to work?

4) Could there be any possible adverse effects from this setup?


TIA

 

 

 

 

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