what is the disadvantage of policing？

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

DHCP SERVER在給一個(gè)網(wǎng)段設(shè)置POOL時(shí)，該網(wǎng)段路由器接口地址能不能放入POOL，能why，不能why。

當(dāng)將多個(gè)交換機(jī)加入到MST region當(dāng)中會(huì)發(fā)生什么（what happen）？

如何實(shí)現(xiàn)擁塞避免？

what is four ospf area type？

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

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?（）

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?（）

Refer to the exhibit.Which statement describes DLCI 17?（）