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