RFC 1034:DOMAIN NAMES - CONCEPTS AND FACILITIES
RFC-Ref

Query Type


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... query specifies a target domain name (QNAME), query type (QTYPE), and query class ...


... when the CNAME RR matches the query type. This allows queries which ask whether an alias is present. ...
... queries which ask whether an alias is present. For example, if the query type is CNAME, the user is interested in the CNAME ...



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