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This question already has an answer here:

Domain exemple-domain.com has two DNS server: dns1.exemple.com (master) and dns2.exemple.com (slave).

questions: If dns1.exemple.com temporarily disabled and dns2.exemple.com works, is it possible that some attempts to define ip addresses fails?

I try it many times in succession

dig @8.8.8.8 exemple-domain.com | awk '/^;; ANSWER SECTION:$/ { getline ; print $5 }'

and part of the query does not receive a reply

Could there be a part of that traffic would be lost if dns1.exemple.com not working and dns2.exemple.com work?

marked as duplicate by Andrew B, kasperd, HBruijn Sep 28 '15 at 18:05

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • I know your question is worded differently, but the linked Q&A answers this topic in detail. – Andrew B Sep 25 '15 at 15:07
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That depends.

If the first server simply isn't answering at all, resolvers should retry their queries against the other one. It is, of course, up to them if they actually do retry or not. And it's another question if the second name server will be able to answer. If it is a slave server and the master server has been gone for too long, all the data the slave had will have expired, so it cannot answer questions (it will still send a response, saying SERVFAIL, though).

So, yes, it could be as you think. As in, it's not impossible. But it is impossible for us to do more than guess wildly until you tell us which domain you're talking about.

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