What is method list for configure aaa？

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

QoS機制中的分類，采用ip數(shù)據(jù)包中的哪個字段？

hsrp speak狀態(tài)是什么意思？

what is the disadvantage of policing？

什么是NAT？

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

What is the next state of initial in spanning-tree protocol？

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?（）

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