单项选择题
A.display fr map-info（显示映射表）
B.display fr pvc-info（PVC统计信息）
C.display fr lmi-info
D.display interface
单项选择题 Refer to the exhibit. What does the (*) represent in the output?（）
单项选择题 A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port（）。
单项选择题 Refer to the exhibit. The user at Workstation B reports that Server A cannot be reacheD.What ispreventing Workstation B from reaching Server A?（）