The braindumps we have seen on the Internet usually are fakes -- not the actual exam. Fortinet is not associated with them in any way. Given that you'd be buying essentially a black market product, don't be surprised if they're a fraud cheating you out of your money.
For the few that are real, the questions are stolen. They are in violation of the NDA contract you agree to when taking the exam. Violators are stripped of their NSE certification. They're subject to a DMCA action by Fortinet Legal.
But you don't need braindumps, anyway.
Fortinet provides practice questions when you take the FortiManager and FortiAnalyzer prep courses. If you use your Study Guide book and the practice questions we give you -- for free -- passing rate data shows that it's very unlikely that you would fail.