## page was renamed from DNS/用語/PublicDNS/Google/ttl
## page was renamed from DNS/PublicDNS/Google/ttl
## page was renamed from DNS/Google公開キャッシュ/ttl
## page was renamed from DNS/キャッシュサーバ/Google/ttl
## page was renamed from DNS/キャッシュサーバ/google/ttl
## page was renamed from DNS/キャッシュサーバの動作/亡霊/google
## page was renamed from DNS/キャッシュサーバの動作/亡霊退治/google
## page was renamed from DNS/キャッシュサーバの動作/亡霊/google
## page was renamed from DNS/キャッシュサーバの動作/浸透問題/google
DNS/キャッシュサーバの動作/浸透問題/googleについて、ここに記述してください。

Google キャッシュサーバもTTLの書き直しはしていないようだ。-- ToshinoriMaeno <<DateTime(2011-08-11T23:20:39+0900)>>
  authority section をどう扱っているか。

{{{
$ dig ns @8.8.8.8 qmail.jp

; <<>> DiG 9.7.3 <<>> ns @8.8.8.8 qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5463
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;qmail.jp.			IN	NS

;; ANSWER SECTION:
qmail.jp.		86400	IN	NS	a.ns.qmail.jp.

;; Query time: 166 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:10 2011
;; MSG SIZE  rcvd: 45

tmaeno@:~$ dig ns @8.8.8.8 qmail.jp

; <<>> DiG 9.7.3 <<>> ns @8.8.8.8 qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29211
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;qmail.jp.			IN	NS

;; ANSWER SECTION:
qmail.jp.		86396	IN	NS	a.ns.qmail.jp.

;; Query time: 68 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:15 2011
;; MSG SIZE  rcvd: 45

tmaeno@:~$ dig ns @8.8.8.8 qmail.jp

; <<>> DiG 9.7.3 <<>> ns @8.8.8.8 qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41888
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;qmail.jp.			IN	NS

;; ANSWER SECTION:
qmail.jp.		86392	IN	NS	a.ns.qmail.jp.

;; Query time: 70 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:19 2011
;; MSG SIZE  rcvd: 45

tmaeno@:~$ dig a @8.8.8.8 www.qmail.jp

; <<>> DiG 9.7.3 <<>> a @8.8.8.8 www.qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28756
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

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

;; ANSWER SECTION:
www.qmail.jp.		3600	IN	A	202.41.218.243

;; Query time: 164 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:31 2011
;; MSG SIZE  rcvd: 46

tmaeno@:~$ dig ns @8.8.8.8 qmail.jp

; <<>> DiG 9.7.3 <<>> ns @8.8.8.8 qmail.jp
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51507
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;qmail.jp.			IN	NS

;; ANSWER SECTION:
qmail.jp.		86373	IN	NS	a.ns.qmail.jp.

;; Query time: 70 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Aug 11 23:17:38 2011
;; MSG SIZE  rcvd: 45
}}}