Which of the following are key characteristics of PPP?（）

The Frame Relay network in the diagram is not functioning properly.What is the cause of the problem?（） 

什么問題導致SERVER VTP密碼跟替他交換機VTP密碼不匹配？

如何實現(xiàn)擁塞避免？

As a CCNA candidate,you must have a firm understanding of the IPv6 address structure.Refer to IPv6 address,could you tell me how many bits are included in each filed?（）

QoS Mechanisms：問在部署QoS中要用的3個mechanisms是什么？

什么是NAT？

A network administrator is troubleshooting the OSPF configuration of routers R1 and R2.The routers cannot establish an adjacency relationship on their common Ethernet link.The graphic shows the output of the show ip ospf interface e0 command for routers R1 and R2.Based on the information in the graphic,what is the cause of this problem?（）

當將多個交換機加入到MST region當中會發(fā)生什么（what happen）？

What is method list for configure aaa？