問(wèn)一個(gè)怎么樣的屬性，能讓路由不通告給任何的peer？

what is four ospf area type？

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

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

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?（）

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。

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

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

what is the disadvantage of policing？