选择题 .  Windows下，nslookup命令结果如下图所示，ftp.softwaretest.com的IP地址是______，可通过在DNS服务器中新建______实现。

C: \Documents and Settings\user＞uslookup ftp.softwaretest.com Server: nsl.aaa.com Address: 1992.168.21.252 Non-authoritativeanswer: Name: nsl,softwaretest.com Address: 10.10.20.1 Aliases: ftp.softwaretest.com

28.