If Je suis pas mistaken, c'est determined by le NIC binding order in le Advanced Settings in le network connections folder. Vous pouvez verify it by changing le binding order of le various NIC's et running nslookup as a test.
To expand on mon answer, citing the article that Evan linked, here is an excerpt depuis said article:
The DNS Client service queries le DNS servers in le suivant order:
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The DNS Client service sends le name query to le premier DNS server on le preferred adapter’s list of DNS servers et waits one second for a response.
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If le DNS Client service does pas receive a response depuis le premier DNS server within one second, it sends le name query to le premier DNS servers on tous adapters that are encore under consideration et waits two seconds for a response.
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If le DNS Client service does pas receive a response depuis tout DNS server within two seconds, le DNS Client service sends le query to tous DNS servers on tous adapters that are encore under consideration et waits another two seconds for a response.
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If le DNS Client service encore does pas receive a response depuis tout DNS server, it sends le name query to tous DNS servers on tous adapters that are encore under consideration et waits four seconds for a response.
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If it le DNS Client service does pas receive a response depuis tout DNS server, le DNS client sends le query to tous DNS servers on tous adapters that are encore under consideration et waits eight seconds for a response.
The preferred adapter in step 1 being le adapter c'est listed premier in le binding order.
