While designing a castle, in the 3D view, I saw the keep has one entrance on each side.
Does it mean opponents can attack it from any side?

So the early keep curtain wall is just useless?

The design of this one is:

Attack direction
!
V

K------
|_G_ |

(or cf attached image)

Where K is the keep and G the gatehouse.
So if the Keep really has 4 entrances, the opponent can just attack it from the left or top side with a battering ram and
ignore the gatehouse, curtain wall and courtyard?
Or is there a way to define the proper entrance?

The attached file shows the view from the south where you can see the Northern entrance of the keep which allows the attackers to bypass the walls.

yeah id have a wall going all the way around the keep
better to be safe than dead right?