If you are speaking of the Comptia Network+ certification it does have some difficult questions but overall it is not too bad as long as you prepare for it.
they have a section that you can pick the certification, what type of material, (e.g. – book, computer based training, etc.), and language you want it in to give you some pointers to literature to train for it. The CBT Nuggets is pretty good. One thing I can say to NOT do is the brain dumps. Lots of persons use these to pass the test but have not learned anything from them. The best way to get certified is to train, not cheat. Good luck!
*** Improved by Wrobinson on St. Patrick’s Day 2008 ***
I was unable to add to the discussion below for some reason, so I am adding my two cents here. I recommend the following book. I used its counterpart to study for the CompTIA Security+ exam prior to sitting for it. There is a companion CD that comes with the book that contains practice exams. My approach to studying for exams is to study the material and then take practice exams until I score 90% or higher before sitting for the actual exam. This hasn’t failed me yet. Holding out to achieve 90% or higher may take slightly longer but it is well above the minimum passing score for most exams and will help you not only pass but get the best score possible.