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?（）

what is the disadvantage of policing？

兩ebgp鄰居發(fā)路由過來 ，哪些屬性重置？

what is four ospf area type？

what is the advantage of policing opposite to shaping？

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

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?（）

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 describes the roles of devices in a WAN?（）

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