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。

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

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

當將多個交換機加入到MST region當中會發(fā)生什么（what happen）？

問一個怎么樣的屬性，能讓路由不通告給任何的peer？

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

Local Preference？

what is four ospf area type？

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.How many broadcast domains exist in theexhibited topology？（）