It's not enough to be able to subnet. You must be able to subnet quickly and accurately. There was A LOT of subnetting to work out on my exam.
I caught a network topology config question late in the exam. I have seen posts that indicate one must look closely at the addressing scheme to complete the question. I didn't have time for that. Had I been a little better at subnetting, I would be a CCNA now.
Best of luck to all...