单项选择题
Which of the following would be used to connect two IDFs in the same building with the LAN, whileminimizing crosstalk?（）
A.RG-6
B.STP
C.CAT3
D.UTP
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A.FTP
B.SFTP
C.SMTP
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Which of the following is used to serve as an emergency backup line to troubleshoot a broadbandconnection on many routers?（）
A.DSL
B.POTS
C.VDSL
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单项选择题
An administrator wants to test the network MTU. Which of the following commands allows differentsize packets to be sent?（）
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