The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.00.0.0.255 any What is the effect of this access list configuration?（）

what is the disadvantage of policing？

What is method list for configure aaa？

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?（）

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

QoS Mechanisms：問在部署QoS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?（）

what is the advantage of policing opposite to shaping？

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 is the three main step of using the QoS feature with MQC command line interface？