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System Design · Concept

DNS

DNS maps domain names to IP addresses. It uses a hierarchy and cached results, so updates may not appear immediately.

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In-depth API docs are only for subscribers: parameters, examples, common mistakes and interview practice.

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  • Content delivery network
  • Load balancer
  • Availability patterns
  • Active-active
  • Fail-over

Source: system-design-primer/README.md at master · donnemartin/system-design-primer · GitHub. Checked 2026-11-03.