Can you tell me how can anesthesia work?

Cutting off signals: Think of consciousness and the perception of pain as a complicated simultaneous communication amongst multiple brain cells. Most brain cells work like wires which talk to several others (up to 1000's!). If any of the wires are prevented from transmitting their signals, that contributes to loss of consciousness. Anesthesia prevents multiple wires from transmitting, with compounded effects.

Unknown.: Theories as to how general anesthesia works abound but simply put, the precise mechanism of action remains unknown.