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單項(xiàng)選擇題

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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單項(xiàng)選擇題

An alternative to plain old telephone service (POTS) would be:（）

A. X.25.
B. Asynchronous transfer mode (ATM).
C. VoIP.
D. Public Switched Telephone Network (PSTN).

單項(xiàng)選擇題

Which of the following commands would be used to display hidden files?（）

A. dir /?
B. dir /d
C. dir /a
D. dir /s

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