TTL
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Time To Live — the duration (in seconds) that a DNS record can be cached before it must be re-queried. Short TTLs (60s) enable fast failover but increase DNS query load. Long TTLs (86400s) reduce load but slow down DNS changes. Propagation delays occur because caches expire at different times.
Key Properties
Related
- Resolution Process (TTL controls caching at each resolver)
- Record Types (each record has its own TTL)