单项选择题
Which of the following is a reason to block FTP at the corporate firewall?（）
A. It does not transfer encrypted files.
B. It cannot be tunneled in a VPN.
C. It is a deprecated protocol.
D. It transmits passwords in clear text
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A. Log the administrator password used
B. Test the air temperature
C. Update the network diagram
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单项选择题
An administrator is deploying three B/G wireless access points in a new office location. Which ofthe following channels eliminates interference?（）
A.1，6，and 11
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单项选择题
Which of the following allows a technician to mask a private network of IP addresses behind onepublic IP address?（）
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