单项选择题 下列哪一条命令用于配置DCC的链路处于断开状态后，重新建立链接等待的时间？（）

单项选择题 A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAC-level security on all these ports?（）

单项选择题 Which type of attack is characterized by a flood of packets that are requesting a TCP connection to a server（）。