单项选择题
At which of the following layers does the TCP protocol operate?（）
A.Layer 1
B.Layer 4
C.Layer 6
D.Layer 7
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A. The wrong cable type has been used.
.B. IDS has shut down the computer's switch port.
C. The port on the switch is configured incorrectly
D. Spanning tree protocol was implemented. -
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B.PSTN
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