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QoS機制中的分類，采用ip數(shù)據(jù)包中的哪個字段？
A network administrator is troubleshooting the OSPF configuration of routers R1 and R2.The routers cannot establish an adjacency relationship on their common Ethernet link.The graphic shows the output of the show ip ospf interface e0 command for routers R1 and R2.Based on the information in the graphic,what is the cause of this problem?（）
Refer to the exhibit.Which statement describes DLCI 17?（）
Which of the following describes the roles of devices in a WAN?（）
When upgrading the IOS image,the network administrator receives the exhibited error message.What could be the cause of this error?（）
QoS Mechanisms：問在部署QoS中要用的3個mechanisms是什么？
Local Preference？
什么是NAT？
R1 will choose which path to reach 10.1.0.0？
What is method list for configure aaa？