[单选题]路由器上激活端口的命令是（）

正确答案 ：B

no shutdown

[多选题]CDP is being used throughout the Ezonexam network. What are two reasons why the Ezonexam network administrator would use CDP? (Choose two)

正确答案 ：BD

To obtain the IP Address of a connected device in order to telnet to the device

To verify Layer 2 connectivity between two devices when Layer 3 fails

[单选题]对交换机的描述，正确的是（）

正确答案 ：B

单广播域，多冲突域的设备

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