單項(xiàng)選擇題

Which of the following ports is the default for HTTP?（）

A.21
B.25
C.80
D.110

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單項(xiàng)選擇題

Which of the following keys is pressed to enter the Windows boot options after POST?（）

A.F1
B.F8
C.F10
D.F12

單項(xiàng)選擇題

A networking device that sends packets to all connections is a:（）

A. gateway.
B. hub.
C. switch.
D. router.

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