QCLASS
The class field in a DNS question. IN is the normal value for Internet DNS queries.
Read definitionAlphabetical glossary
Q glossary terms
11 definitions beginning with Q.
11 terms
QNAME
The domain name in the question section of a DNS query. During alias processing, the original QNAME can lead to one or more other names and RRsets.
Read definitionQNAME minimization
A recursive-resolver technique that sends only the minimum name needed at each delegation step instead of exposing the full original query name to every upstream server. It improves privacy and can reduce unnecessary data disclosure.
Read definitionQPS
Queries per second, a common measurement of DNS request rate. Capacity planning should consider peaks, response sizes, cache behavior, query types, and failure scenarios rather than QPS alone.
Read definitionQR bit
The Query/Response bit in the DNS header. A value of 0 indicates a query and 1 indicates a response.
Read definitionQTYPE
The numeric type requested in a DNS question, such as A, AAAA, MX, or a meta-type such as ANY. QTYPE values share the IANA RR TYPE registry.
Read definitionQuery
A DNS message sent to request information or perform an operation. Most queries contain one question, though the protocol format can represent more.
Read definitionQuery logging
Recording DNS query metadata such as time, client, name, type, response code, latency, and selected policy. Logging improves troubleshooting and security visibility but requires privacy, retention, and volume controls.
Read definitionQuery name
A plain-language synonym for QNAME, the domain name being asked about in a DNS question.
Read definitionQuestion section
The DNS message section containing QNAME, QTYPE, and QCLASS. Normal queries usually contain one question.
Read definitionQuorum
The minimum set of nodes or votes required to make authoritative cluster decisions. Quorum prevents split-brain writes but may sacrifice management availability when too many members are unreachable.
Read definition