Is it true that if you fail one of the CCNP certification exams you will need to wait six months before retaking it?
The good thing here is that this is not the case :)
Candidates who fail an exam must wait a period of five (5) calendar days, beginning the day after the failed attempt, before they may retest for the same exam.
Once passed, a candidate must wait a minimum of 180 days before taking the same exam with an identical exam number.
Hope this helps!