Can a knight win against a bishop?

Here is an ending with Knight versus Bishop. What will be the outcome ? The answer is sometimes it can be a win, sometimes it can be a draw, depending on the game position.

Knight versus Bishop (also called Elephant)

This is a draw as shown in the diagram here since the Elephant and the King are not on the same side (in relation to the centre file). Popularly it is known as "door east gate west" (men dong hu xi)