单项选择题
Which of the following protocols uses UDP to transfer files?（）
A.FTP
B.SFTP
C.SMTP
D.TFTP
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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
D.Smart jack -
单项选择题
An administrator wants to test the network MTU. Which of the following commands allows differentsize packets to be sent?（）
A.netstat
B.traceroute
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