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

How should arouter that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates?（）

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

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

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

hsrp speak狀態(tài)是什么意思？

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

如何實現(xiàn)擁塞避免？

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?（）

QoS Mechanisms：問在部署QoS中要用的3個mechanisms是什么？