DNS 答案的顺序有多重要？
例子：
如果您host -a google.com在终端中输入，您将看到：
;; ANSWER SECTION:
google.com. 300 IN A 172.217.21.14
google.com. 300 IN AAAA 2a00:1450:4016:80b::200e
google.com. 3600 IN TXT "v=spf1 include:_spf.google.com ~all"
google.com. 345600 IN NS ns4.google.com.
google.com. 600 IN MX 30 alt2.aspmx.l.google.com.
google.com. 600 IN MX 40 alt3.aspmx.l.google.com.
google.com. 345600 IN NS ns2.google.com.
google.com. 60 IN SOA ns1.google.com. dns-admin.google.com. 192227941 900 900 1800 60
google.com. 300 IN TXT "docusign=05958488-4752-4ef2-95eb-aa7ba8a3bd0e"
google.com. 600 IN MX 20 alt1.aspmx.l.google.com.
google.com. 600 IN MX 50 alt4.aspmx.l.google.com.
google.com. 345600 …