[单选题]While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows "request times out."At which OSI layer is this problem associated with?

正确答案 ：E

The network layer

解析：解析：Explanation:

[多选题]Which of the following steps are necessary in order to add a new VLAN to the Ezonexam switched network? (Select all that apply)

正确答案 ：ABD

Create the VLAN.

Name the VLAN.

Add the desired ports to the new VLAN.

解析：解析：Explanation:

[单选题]FTP工作在OSI哪一层（）

正确答案 ：D

应用层

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