1. watchA

以下の返事を丸呑みすると、毒が入る。-- ToshinoriMaeno 2019-03-19 15:25:24

$ dig www.yahoo.com @ns1.yahoo.com

; <<>> DiG 9.12.3 <<>> www.yahoo.com @ns1.yahoo.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24292
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 3
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1272
; COOKIE: 8405d1c10f9d6fc6716df12c5c910802bee923abc5bd60bf (good)
;; QUESTION SECTION:
;www.yahoo.com.                 IN      A

;; ANSWER SECTION:
www.yahoo.com.          1800    IN      CNAME   atsv2-fp-shed.wg1.b.yahoo.com.

;; AUTHORITY SECTION:
wg1.b.yahoo.com.        172800  IN      NS      yf4.a1.b.yahoo.net.
wg1.b.yahoo.com.        172800  IN      NS      yf1.yahoo.com.
wg1.b.yahoo.com.        172800  IN      NS      yf2.yahoo.com.
wg1.b.yahoo.com.        172800  IN      NS      yf3.a1.b.yahoo.net.

;; ADDITIONAL SECTION:
yf1.yahoo.com.          86400   IN      A       68.142.254.15
yf2.yahoo.com.          86400   IN      A       68.180.130.15

;; Query time: 110 msec
;; SERVER: 68.180.131.16#53(68.180.131.16)
;; WHEN: 水  3月 20 00:17:22 JST 2019
;; MSG SIZE  rcvd: 222

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