When an Ethernet cable breaks, the first step is to experience the full range of human emotions: fear, anger, despair. Allow yourself to wallow in the existential crisis of a lost connection.
Carefully examine the cable for any signs of life. Check for the faint glow of a severed connection, or the soft murmur of a dying signal.
Use a combination of duct tape, twine, and sheer willpower to MacGyver the cable back together.
Admit defeat and call in the experts. Or, you know, just Google it.