A machine A sends a message to a machine B directly connected to it. Which proposition is correct ?

Question

Accepted Answer

If a collision occurs, machine A will, in all cases, be aware of the collision

Answer

If a collision occurs, it is the physical layer that will manage the detection and retransmission of the message

Answer

If a collision occurs machine A might not be aware of the collision, other layers will detect the loss and ensure retransmission

Answer

If machine A detects the collision, it will ask layer 3 to retransmit

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