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