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

Local Preference？

如何實現擁塞避免？

問一個怎么樣的屬性，能讓路由不通告給任何的peer？

what is the advantage of policing opposite to shaping？

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

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

What is method list for configure aaa？

aaa架構中哪個是要求用戶輸入用戶名和密碼？

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