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多选题
For what two purposes does the Ethernet protocol use physical addresses？（）
A
to uniquely identify devices at Layer 2
B
to allow communication with devices on a different network
C
to differentiate a Layer 2 frame from a Layer 3 packet
D
to establish a priority system to determine which device gets to transmit first
E
to allow communication between different devices on the same network
F
to allow detection of a remote device when its physical address is unknown
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