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Which OSI layer does a bridge operate at?
A．the Physical Layer
B．the Network Layer
C．the Transport Layer
D．the Data Link Layer
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单选题A computer is connected to the network through a NIC， which has a unique assignment that is called the Ethernet MAC address. Which layer of the OSI model does the MAC address use to communicate with the network？（）A
networkB
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sessionD
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单选题At which layer of the OSI model does the Spanning Tree Protocol （STP） operate at？（）A
Layer 5B
Layer 4C
Layer 3D
Layer 2E
Layer 1
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