問一個(gè)怎么樣的屬性，能讓路由不通告給任何的peer？

what is the disadvantage of policing？

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?（）

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

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 advantage of policing opposite to shaping？

R1 will choose which path to reach 10.1.0.0？

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?（）

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

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