How DNS Works: Resolvers, Record Types, TTL and Querying with dig
DNS resolves a name through a chain of stub resolver, recursive resolver, root, TLD and authoritative servers and caches every answer for its TTL. dig +trace, A/AAAA/CNAME/MX/TXT/CAA/HTTPS records, negative caching, DoH, and a blue-green experiment showing why HttpClient's open connections don't see DNS changes.
8 Nov 2026
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10 min
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7
