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）？

QoS機制中的分類，采用ip數(shù)據(jù)包中的哪個字段？

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

aaa架構(gòu)中哪個是要求用戶輸入用戶名和密碼？

如何實現(xiàn)擁塞避免？

Refer to the exhibit.The network administrator is in acampus building distant from Building B.WANRouter is hosting a newly installed WAN link on interface S0/0.The new link is not functioning and the administrator needs to determine if the correct cable has been attached to the S0/0 interface.How can the administrator accurately verify the correct cable type on S0/0 in the most efficient manner?（）

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

What is method list for configure aaa？

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