Negative Caching

When iteratively querying a server in the ancestral line of the record that:

• 1. Doesn’t have the record.
• 2. Has no relevant delegations.

The server will respond with an authoritative negative response. A resolver with negative caching will cache the negative response for a set time period, usually ten minutes. The resolver will reply with a non-authoritative negatives response to the query for that set period