TTL in DNS records indicates what?

• A. The number of DNS servers that may answer
• B. The duration records may be cached by resolvers
• C. The maximum size of DNS responses
• D. The frequency of zone transfers

Answer: (B)

TTL, or Time To Live, in DNS records specifies how long a resolver can cache that record before it must query again for updated information. This caching helps reduce DNS traffic and speeds up lookups. A longer TTL means data can be reused longer but risks serving stale information if the record changes; a shorter TTL allows faster propagation of updates but increases query load. The other options don’t describe TTL—it's not about how many servers may answer, the maximum size of responses, or how often zone transfers occur.