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I was just curious about the nomenclature of certain variables part of DNS's RFC: https://www.ietf.org/rfc/rfc1035.txt
While I was able to find most other acronyms :
I was wondering what does "QD" stand for in the "QDCOUNT"?
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The Dns class is a static class that retrieves information about a specific host from the Internet Domain Name System (DNS). The host information from the DNS query is returned in an instance of the IPHostEntry class.
DNS message formatA header field (flags) controls the content of these four sections. The header section consists of the following fields: Identification, Flags, Number of questions, Number of answers, Number of authority resource records (RRs), and Number of additional RRs.
The header is exactly 12 bytes long and is exactly the same for a DNS query or DNS response.
it wasn't an acronym. QDCOUNT just means what it's defined to mean. FWIW, i always think of it as Query Domain Count, because the query section has no RDATA's in it unlike the other sections, each query has just a Name, Class, and Type.
note that this field is useless now, because BIND has always rejected QDCOUNT != 1. there is no way to ask more than one question per transaction, and it's not an oversight, rather it's because there is only one AA bit to describe the entire answer section.
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