单项选择题

WhatsthedefaultstratumclockonaCiscorouter，whenyouseethe……

What s the default stratum clock on a Cisco router， when you see the key word "master" configured on the NTP line？（）

A.1
B.2
C.4
D.6
E.8

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问答题先描述的就是源树。然后说源和receiver通讯，问process叫什么？

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?（）

A.Single-rate，two-color marker
B.Three-rate，two-color marker
C.Two-rate，three-color marker
D.Single-rate，three-color marker