单项选择题
Which of the following ports does POP3 services use, by default?（）
A.25
B.110
C.143
D.443
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A. Incorrect DNS
B. Incorrect subnet mask
C. Duplicate IP address
D. Incorrect SSID -
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A technician is reporting wireless transmission speeds of 300Mbps. Which of the following wireless standards is being used?（）
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C. NAT
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