## page was renamed from DNS/RCODE/NXDOMAIN
## page was renamed from DNS/1/RCODE/NXDOMAIN
## page was renamed from DNS/1/RCODE/NXDomain
== DNS/1/RCODE/NXDomain ==

SOA record in NXDOMAIN response means where are NO zone cuts!
  Under the name of the label of SOA record, NO zone cuts exist.

[[/example.jp]]  [[/www.nsd.e-ontp.com]]
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NXDOMAIN返答であっても、SOAレコードがあるとは限らない。
　どういう場合か。(クイズ)
　
NXDOMAIN返答であっても、Answer Sectionがあることがある。[[/例]]

https://twitter.com/tss_ontap_o/status/907832980374159361
{{{
DNS 温泉 4 の予習して悩んでいる人がもっと悩めるスレ > 
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"CNAME and NXDOMAIN" https://www.ietf.org/mail-archive/web/namedroppers/current/thrd8.html#06284
 … 
14:07 - 2017年9月13日 
== response format ==
RCODE=NXDomain, AA=1
 * No Answer Section
 * Authority Section contains a SOA record (owner is at/below cut and at/above query name)
 * No Additionl Section

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https://www.ietf.org/proceedings/94/slides/slides-94-dnsop-9.pdf

https://tools.ietf.org/html/draft-ietf-dnsop-nxdomain-cut-01

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NXDOMAIN really means there is nothing underneath
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                    draft-ietf-dnsop-nxdomain-cut-01

This document states clearly that when a DNS resolver receives a
   response with response code of NXDOMAIN, it means that the domain
   name which is thus denied AND ALL THE NAMES UNDER IT do not exist.

REMOVE BEFORE PUBLICATION: this document should be discussed in the
   IETF DNSOP (DNS Operations) group, through its mailing list.  The
   source of the document, as well as a list of open issues, is
   currently kept at Github [1].

This documents clarifies RFC 1034 and modifies a bit RFC 2308 so it
   updates both of them.