简答题 怎样保护密码？

多项选择题Refer to the exhibit. A network engineer received a sudden request to prioritize voice over his Cisco network and he has decided to leverage the AutoQoS feature. Based on the output shown, which two tasks need to be performed prior to issuing the autoqos voip command in this router? （）

A.Enable Cisco Express Forwarding.
B.Enable fast switching.
C.Delete all policy maps.
D.Remove service-policy commands from interface serial1/0.
E.Delete all the currently configured class maps.

单项选择题WhatsthedefaultstratumclockonaCiscorouter，whenyouseethekeyword master configuredontheNTPline？（）

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

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？