Which of the following describes the roles of devices in a WAN?（）

如何實(shí)現(xiàn)擁塞避免？

QoS Mechanisms：?jiǎn)栐诓渴餛oS中要用的3個(gè)mechanisms是什么？

How should arouter that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates?（）

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

R1 will choose which path to reach 10.1.0.0？

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

兩ebgp鄰居發(fā)路由過(guò)來(lái) ，哪些屬性重置？

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?（）

aaa架構(gòu)中哪個(gè)是要求用戶(hù)輸入用戶(hù)名和密碼？