Glossary
DNS
Authoritative server
A server that holds a zone’s data and answers for it directly rather than from cache. Querying one bypasses caching, which is why it is the right place to check what you just published.
Defined in RFC 1034 §4.
Where this appears
The lessons that use this term, and what each is for.
Domain Security FundamentalsHow a name resolvesTrace a lookup from the root down and name what each step contributes.Domain Security FundamentalsReading DNS by handUse dig to ask the authoritative server directly, and know when the answer you got is not the answer everyone gets.DNS Security PractitionerOne provider is one outageQuantify what a single authoritative provider means for every service you run.DNS Security PractitionerAn open transferTest a nameserver for open transfer and say what one hands to anyone who asks.Domain Abuse & ImpersonationHosting patternsRead hosting choices as evidence, and say where that evidence stops.