I'm a newbie and therefore will ask a lot of silly ones... Here it goes: In the very beginning, when adding the cube, ...

I'm a newbie and therefore will ask a lot of silly ones... Here it goes: In the very beginning, when adding the cube, cutting it in half and selecting it with the B key. When you press X and delete "Faces", it is supposed to delete all the faces of the side you selected? Or only the front face?