Tag
negative-caching
- Aug 22, 2025 Negative Caching: NXDOMAIN, NODATA, and the SOA Minimum How a resolver distinguishes a name that does not exist from a name with no records of the requested type, and how the SOA fields set the lifetime of both. internet protocols
- Apr 8, 2024 Caching Absence with Negative Entries and Bloom Filters How a cache represents the answer "this does not exist", why missed negative lookups are more dangerous than missed positive ones, and what a Bloom filter costs in bits per key and false positives. backend systems