行一个查询命令host。通过此命令，入侵者可获得保存在目标域服务器中的所有信息。其查询结果所含信息量的多少主要依靠于网络的大小和结构。

-Line a query command host. With this command, the intruder get all the information in the target domain server save. How much information is contained in its query results mainly depend on the size and structure of the network.