DNS (Domain Name System) translates names used by people and applications into records such as IP addresses and service locations. Resolution may involve local caches, recursive resolvers, authoritative servers and registrars, with separate owners and failure modes. DNS does more than map a website to one address, and cached answers can delay a change. Design should document zones, delegation, record ownership, time to live, access and recovery. Redundant servers must avoid a shared provider or configuration failure if genuine independence is required. DNSSEC can authenticate signed data but does not encrypt queries or correct a bad record. Tests should use external and internal paths, confirm intended answers and observe expiry. A server responding successfully does not prove that every resolver sees the same current configuration.
IT glossary
DNS (Domain Name System)
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