QoS機制中的分類，采用ip數據包中的哪個字段？

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

what is the advantage of policing opposite to shaping？

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

Local Preference？

Refer to the exhibit.The network administrator is in acampus building distant from Building B.WANRouter is hosting a newly installed WAN link on interface S0/0.The new link is not functioning and the administrator needs to determine if the correct cable has been attached to the S0/0 interface.How can the administrator accurately verify the correct cable type on S0/0 in the most efficient manner?（）

A default Frame Relay WAN is classified as what type of physical network?（）

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?（）

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

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