What is the strongest technology that would assure alice that bob is the sender of a message?

Answerhostname;

Once the twisted pair cable is connected and a network is established the led lights at the back of the computer should be steady. on most ethernet adapters nowadays, a steady green light means that the connection is actively connected to a valid partner at the opposite end. if the status of the led starts flashing, this means that there’s some activity and data is being transferred.

Ais the answer

By going on youtube and watching a volcano eruption video