单项选择题 A network administrator is verifying the configuration of a newly installed host by establishing an FTP connection to a remote server. What is the highest layer of the protocol stack that the nework administrator is using for this operation?（）

单项选择题 根据下图中展示的show running-config命令的结果。网络管理员该如何做才能允许工作站连接到FastEthernet0/0接口去获得一个IP地址？（）

多项选择题 What three pieces of information can be used in an extended access list to filter traffic (Choose three.)（）。