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DNS — the distributed hierarchical naming system that translates domain names into records such as IP addresses and mail-routing information.
DNS is a distributed hierarchy. A resolver starts with available data and, when necessary, queries root, TLD, and authoritative servers. TTL-based caching reduces query volume but delays the visibility of changes.
DNS — the distributed hierarchical naming system that translates domain names into records such as IP addresses and mail-routing information.
This component participates in locating, storing, or returning authoritative data about domain names. Its role is determined by its place in the hierarchy and the type of DNS query.
Query the authoritative servers and a recursive resolver separately. Compare the answer, TTL, delegation, and cache state to distinguish a zone error from stale client-side data.
