For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)

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For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)

A. to uniquely identify devices at Layer 2
B. to allow detection of a remote device when its physical address is unknown
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 communication with devices on a different network