Refer to the exhibit.What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown？（）

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

Local Preference？

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

When upgrading the IOS image,the network administrator receives the exhibited error message.What could be the cause of this error?（）

What field in IP packet is used for classification by QOS？

four switches， which one will be root switch.（no pic）.

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?（）

SPT初始狀態(tài)之后的一個(gè)狀態(tài)是什么？

如何實(shí)現(xiàn)擁塞避免？