单项选择题
Which of the following command line utilities can Karen, a technician, use to check for open ports?（）
A.nbtstat
B.ipconfig
C.nslookup
D.netstat
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A. X.25.
B. Asynchronous transfer mode (ATM).
C. VoIP.
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单项选择题
Which of the following commands would be used to display hidden files?（）
A. dir /?
B. dir /d
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A technician has a user that consistently picks up viruses and malware no matter what kind ofsoftware is installed to prevent infection. Which of the following should be a cost-effective logical step in preventing future infections?（）
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