什么是NAT？

What is the three main step of using the QoS feature with MQC command line interface？

what is four ospf area type？

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

what is the advantage of policing opposite to shaping？

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

hsrp speak狀態(tài)是什么意思？

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?（）

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

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