TTL (Time To Live)
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TTL은 [[dns|DNS]] 레코드에서 [[dns-cache|캐시된]] 응답이 유효한 시간(초)을 지정하는 값입니다. TTL이 낮을수록 DNS 변경 사항의 전파는 빠르지만 [[authoritative-dns|권위 서버]]에 대한 쿼리 부하가 증가합니다.
예시
A TTL of 300 (5 minutes) means DNS changes propagate quickly; a TTL of 86400 (24 hours) reduces server load but delays updates.