问题
单项选择题
Which OSI layer does a Bridge operate at ( )
A．the Physical Layer
B．the Data Link Layer
C．the Transport Layer
D．the Network Layer
答案
参考答案：B
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Which OSI layer does a Bridge operate at ( )
A．the Physical Layer
B．the Data Link Layer
C．the Transport Layer
D．the Network Layer
参考答案：B