[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]扩展IP访问权限表的表号范围是：()

正确答案 ：C

100-199

[单选题]FTP工作在OSI哪一层（）

正确答案 ：D

应用层

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