单项选择题

Which of the following is a secure method of remote access via command line?（）

A.RCP
B.Telnet
C.RSH
D.SSH

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An administrator is using a protocol analyzer to monitor traffic between two servers. However, the only traffic that appears is broadcast and traffic originating from the administrator's PC.
Which of the following devices is the administrator plugged into? （）

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单项选择题

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