Summary
DNS has a common message format for DNS Name Query Request and Name Query Response messages and a different common message format for DNS Update and Update Response messages. DNS messages have a fixed-size portion and a variable sized portion. The variable-sized portion contains entries and records to perform name resolution, registration, and zone transfers between DNS servers. DNS name resolution, either for a recursive or iterative query, consists of an exchange of DNS Name Query Request and Name Query Response messages. For successful resolution, the Name Query Response message contains the RRs for the FQDN that was requested. DNS name registration consists of an exchange of DNS Update and Update Response messages. For successful registration, ...
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