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單項(xiàng)選擇題

Which of the following would MOST likely be used to punch down LAN cables before connecting them to the main switch?（）

A. IDF
B. 66 block
C. MDF
D. 110 block

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單項(xiàng)選擇題

In which of the following layers of the OSI model does the TCP protocol operate?（）

A.Session
B.Network
C.Data link
D.Transport

單項(xiàng)選擇題

Which of the following ports does POP3 services use, by default?（）

A.25
B.110
C.143
D.443

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