单项选择题
Refer to the exhibit. This exhibit shows the NAT configuration for Router A and the output for a ping issued from device 171.68.200.48 and destined to 172.16.47.142. Based on this information， what change must be made to Router A in order for the ping to work？（）
A.reload the router B.clear the route cache C.add a static route D.configure IP as classless E.load a newer IOS image
问答题 NTP怎么度量距离可靠源的距离？
问答题 什么协议可以使用虚拟IP和虚拟MAC，在错误发生的时候，避免连接的丢失。
单项选择题 Refer to the exhibit. Based on this configuration, what type of marker is achieved?（）
