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

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

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

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

Explanation: Physical addresses or MAC addresses are used to identify devices at layer 2 -> A is correct.

MAC addresses are only used to communicate on the same network. To communicate on different network we have to use Layer 3 addresses (IP addresses) -> B is not correct; E is correct.

Layer 2 frame and Layer 3 packet can be recognized via headers. Layer 3 packet also contains physical address -> C is not correct.

On Ethernet, each frame has the same priority to transmit by default -> D is not correct.

All devices need a physical address to identify itself. If not, they can not communicate -> F is not correct.

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