单项选择题
A network admin wants to know every hop the packets take when he accesses cisco.com. Which command is the most appropriate to use?（）
A. path cisco.com B. debug cisco.com C. trace cisco.com D. traceroute cisco.com
单项选择题 Which line from the output of the show ip interface command indicates a layer 1 problem?（）
单项选择题 Which statement about IPv6 is true?（）
单项选择题 Which statement about RIPng is true?（）
