For what two purposes does the Ethernel protocol use physical addresses? $($Select Two$)$

to uniquely idemity devices al Layel $2$

to allow defection of a remote device when is physical address is unknown

to differentiate a Layer $2$ frame from a Layer $3$ packet

to establish a priority system to determine which device gets fo transma firs

to allow comment devices on the same network

to allow communcation with devices on a different nefwork.