What does TTL stand for in DNS?

What does TTL stand for in DNS?

• A. Time to Live
• B. Time to Lease
• C. Time to Locale
• D. Time to Last

Answer: (A)

TTL in DNS stands for Time to Live, the duration a DNS record is allowed to be cached by resolvers before it must be refreshed from authoritative servers. This value, specified in seconds in DNS responses, is set by the zone administrator and controls how long you can reuse a cached result. Longer TTLs reduce query traffic and speed up responses for repeated lookups, but risk serving stale data if the underlying resource changes. Shorter TTLs keep data fresher but increase DNS query load. The other options don’t match DNS terminology: Time to Lease is associated with DHCP, while Time to Locale and Time to Last aren’t standard DNS terms.

TTL in DNS stands for Time to Live, the duration a DNS record is allowed to be cached by resolvers before it must be refreshed from authoritative servers. This value, specified in seconds in DNS responses, is set by the zone administrator and controls how long you can reuse a cached result. Longer TTLs reduce query traffic and speed up responses for repeated lookups, but risk serving stale data if the underlying resource changes. Shorter TTLs keep data fresher but increase DNS query load. The other options don’t match DNS terminology: Time to Lease is associated with DHCP, while Time to Locale and Time to Last aren’t standard DNS terms.