Local Preference？

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

what is the advantage of policing opposite to shaping？

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?（）

如何實(shí)現(xiàn)擁塞避免？

QoS機(jī)制中的分類，采用ip數(shù)據(jù)包中的哪個字段？

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?（）

hsrp speak狀態(tài)是什么意思？

Refer to the exhibit.How many broadcast domains exist in theexhibited topology？（）

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