$host -t SRV _ldap._tcp.samdom.example.com.
_ldap._tcp.samdom.example.com has SRV record 0 100 389 dc1.samdom.example.com.

我们来看看RFC 2782,A DNS RR for specifying the location of services (DNS SRV)

@H_301_4@The format of the SRV RR

@H_301_4@Here is the format of the SRV RR,whose DNS type code is 33:

@H_301_4@_Service._Proto.Name TTL Class SRV Priority Weight Port Target

@H_301_4@所以虽然你的例子没有列出TTL,但我们知道它的类是IN,它的类型是SRV ……

@H_301_4@_ldap._tcp.samdom.example.com 0 100 389 dc1.samdom.example.com.

@H_301_4@>名称_ldap._tcp.samdom.example.com
>优先级0
>重量100
> 389号港口
>目标dc1.samdom.example.com.

@H_301_4@