I am starting to see why I failed now. There are too many subjects to review and I only really reviewed the 200-105 book. But the 200-125 exam takes parts from both books.
The NAT part of the exam (see title) is only covered in the first book (100-105).
Next time I would probably take the 2 exam route. Now I am sticking to the single exam approach.
So 5.6.a Static:
On the inside local interface (e0/0) type:
ENT1(config-if)#ip nat inside
On the puside local interface (s2/0) type:
ENT(config-if)#ip nat outside
Then in global config mode type:
ENT1(config)#ip nat inside source static 192.168.0.126 184.108.40.206