单项选择题
A.ping atm vci 0.100 interface at-0/1/0 end-to-end
B.ping atm vci 0.100 interface at-0/1/0 circuit
C.ping atm vci 0.100 interface at-0/1/0 far-end
D.ping atm vci 0.100 interface at-0/1/0 final-hop
单项选择题 Which command would you type to see a concise display of which interfaces are up and which are down?（）
单项选择题 In Ethernet networks, duplex mismatches will lower performance. Which error statistics can be seen if a duplex mismatch is present?（）
多项选择题 To troubleshoot interface problems, you can use both the disable command and the deactivate command. Which two statements are correct?（）