using NS servers with different records

Let's say I have a domain called In that domain I have two NS records: and I also have A-records that specify the IP addresses for these servers.

But let's say my Name Server internaldns (which is the 1st NS record) contains the following A records:

Now my other Name Server (externaldns, the 2nd NS record) only contains the following A records:
ftp .

Now when someone would enter the URL '', does it first query my first Name Server (internaldns) and then the other Name Server (externaldns), or does it immediately fail if it can't find the requested name on the first server?
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It would fail on the first dns as name not found.  Both the name servers should have the same hosts listed.  What you can do is have an entry in the external dns that points to the internal address, and if it is a unroutable address, it would not be of much use to external users.  There would be a minor exposure of an external hacker knowing your internal network structure, but it is not enough to worry about.

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RHochstenbachAuthor Commented:
Thanks for you help, I will make sure that the records in both servers are the same.
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