DNS/返答/NoData/返答例について、ここに記述してください。

Answer Sectionは空。

Authority SectionにSOAレコードがあれば、　

Authority SectionにSOAレコードがなければ、

SOAレコードがないと、否定返答はキャッシュに保持しない。

1. 返答例

%dig -t a notexist.qmail.jp @a.ns.qmail.jp                     ~/dnsq/1210

; <<>> DiG 9.12.1 <<>> -t a notexist.qmail.jp @a.ns.qmail.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9680
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;notexist.qmail.jp.             IN      A

;; AUTHORITY SECTION:
qmail.jp.               900     IN      SOA     a.ns.qmail.jp. hostmaster.m.qmail.jp. 1544367874 16384 2048 1048576 900
qmail.jp.               259200  IN      NS      b.ns.qmail.jp.

;; ADDITIONAL SECTION:
b.ns.qmail.jp.          172800  IN      A       14.192.44.5

;; Query time: 0 msec
;; SERVER: 14.192.44.5#53(14.192.44.5)
;; WHEN: Fri Dec 14 08:26:32 JST 2018
;; MSG SIZE  rcvd: 121

2. 返答例 2

%dig -t a konnanamae.jp @a.dns.jp                              ~/dnsq/1210

; <<>> DiG 9.12.1 <<>> -t a konnanamae.jp @a.dns.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 28257
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 352c726e9d4f7f24ecaf8a5f5c12eb21549e2c44df2bc206 (good)
;; QUESTION SECTION:
;konnanamae.jp.                 IN      A

;; AUTHORITY SECTION:
jp.                     900     IN      SOA     z.dns.jp. root.dns.jp. 1544742901 3600 900 1814400 900

;; Query time: 6 msec
;; SERVER: 203.119.1.1#53(203.119.1.1)
;; WHEN: Fri Dec 14 08:28:33 JST 2018
;; MSG SIZE  rcvd: 117

3. 返答例 3

%dig +nocookie -t ns konnanamae.003.jp @ns1.xserver.jp         ~/dnsq/1210

; <<>> DiG 9.12.1 <<>> +nocookie -t ns konnanamae.003.jp @ns1.xserver.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32429
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;konnanamae.003.jp.             IN      NS

;; Query time: 8 msec
;; SERVER: 219.94.200.164#53(219.94.200.164)
;; WHEN: Fri Dec 14 08:33:52 JST 2018
;; MSG SIZE  rcvd: 35

4. 奇妙な返答の例

権威サーバーとして登録されているはずなのに： 

%dig -t DNSKEY 568.co.jp @penguin.kddnet.ad.jp                ~/dnsq/1210

; <<>> DiG 9.12.1 <<>> -t DNSKEY 568.co.jp @penguin.kddnet.ad.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57755
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1400
;; QUESTION SECTION:
;568.co.jp.                     IN      DNSKEY

;; Query time: 10 msec
;; SERVER: 210.132.91.129#53(210.132.91.129)
;; WHEN: Thu Dec 13 11:19:38 JST 2018
;; MSG SIZE  rcvd: 38

%dig -t DNSKEY beer.co.jp @ns1.emissary.co.jp.                ~/dnsq/1210

; <<>> DiG 9.12.1 <<>> -t DNSKEY beer.co.jp @ns1.emissary.co.jp.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5151
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1680
;; QUESTION SECTION:
;beer.co.jp.                    IN      DNSKEY

;; Query time: 9 msec
;; SERVER: 39.110.247.145#53(39.110.247.145)
;; WHEN: Thu Dec 13 11:30:59 JST 2018
;; MSG SIZE  rcvd: 39

%dig -t DNSKEY beer.co.jp @ns3.emissary.co.jp.                ~/dnsq/1210

; <<>> DiG 9.12.1 <<>> -t DNSKEY beer.co.jp @ns3.emissary.co.jp.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 18625
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1680
;; QUESTION SECTION:
;beer.co.jp.                    IN      DNSKEY

;; Query time: 11 msec
;; SERVER: 54.95.51.99#53(54.95.51.99)
;; WHEN: Thu Dec 13 11:30:46 JST 2018
;; MSG SIZE  rcvd: 39