I made a YouTube video yesterday attempting to analyze the Facebook outage and realized I have a pretty big gap in my knowledge regarding the DNS hierarchy and what records actually are authoritative for DNS. The SOA designates the primary name server, but I think DNS resolvers only ever actually look at the NS records for a host. Is the SOA primary name server entry actually used for anything? Is there ever a case where the SOA listed primary name server would not be present in the NS records for a domain?
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