[dns-operations] Test on Priming Behavior

[Davey Song]

Hi folks,

I am doing a test on priming exchange from different DNS software’s and
find something weird. BIND(v9.8.1, v9.9.4, v9.10.1 ) would send NS query
and a query simultaneously rather than wait until NS query get answered.
PowerDNS(v3.3) will not do any NS query but query base on the content in
hint file when root-hint is configured. Does anyone know any consideration
or risk of these implementation?

Regards,
Davey
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