考虑以下命令运行dig，我只是查询google.com的 IP 地址：
$ dig google.com
; <<>> DiG 9.16.1-Ubuntu <<>> google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32427
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;google.com. IN A
;; ANSWER SECTION:
google.com. 276 IN A 142.250.71.14
;; Query time: 1437 msec
;; SERVER: 192.168.225.1#53(192.168.225.1)
;; WHEN: Sun May …