CCNA Cisco Certified Network Associate (#203)

Section: Version 2.0

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

to uniquely identify devices at Layer 2
to allow detection of a remote device when its 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 to transmit first
to allow communication between different devices on the same network
to allow communication with devices on a different network