Local Preference？

When upgrading the IOS image,the network administrator receives the exhibited error message.What could be the cause of this error?（）

如何實現(xiàn)擁塞避免？

SPT初始狀態(tài)之后的一個狀態(tài)是什么？

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

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

Which of the following describes the roles of devices in a WAN?（）

R1 will choose which path to reach 10.1.0.0？

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

當(dāng)將多個交換機(jī)加入到MST region當(dāng)中會發(fā)生什么（what happen）？