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Why NS record is needed in Zone file?

beer9 asked
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Last Modified: 2017-04-08
I am wondering why NS record is needed in the DNS zone file. Client gets the NS record with IP (GLUE record) from the TLD and then proceed further with name resolution. So where do we do we need NS record from zone file in name resolution process. Even if this information is not available in zone file then still name resolution will happen smoothly.

Appreciate any hindsight to it. Thanks!
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