What can ranchers do to protect their livestock from wolves?

Ranchers are always worried about their live stock. the ranchers are near Yellowstone national park and they worry because of wolves. The wolves wonder out of the park and the eat the ranchers livestock. Some things the ranchers could do is put up some traps and trap them then send them back to the park or make a wall high enough that the wolves cant jump over or they could move with their livestock to a different location. There is endless possibilities for what the ranchers could do. See if you can come up with some answers