单项选择题
Which command is used to debug a ping command?（）
A. debug icmp B. debug ip icmp C. debug tcp D. debug packet
单项选择题 Which command is used to see the path taken by packets across an IP network?（）
单项选择题 Which command would you configure globally on a Cisco router that would allow you to view directly connected Cisco devices?（）
单项选择题 Which command is used to configure a default route?（）
