单项选择题
Which of the following network hardware allows the MOST network traffic collisions?（）
A.WAP
B.Hub
C.Switch
D.Router
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单项选择题
In the OSI model, which of the following layers would be the cause of a session time-out while browsing the web?（）
A.Laye r2
B.Layer 3
C.Layer 5
D.Layer 7
