Just got my A+ cert and wanted to say thanks. I used pretty much everything at my disposal. Your videos, a book you recommended, the practice tests you arranged, ran VMs for various Windows versions and a great little quiz app for Android called Quizzer by WayraSoft (it lets you author your own multiple choice quizzes).
Now on to Network+. Now from what I can glean from the CompTIA website, I don't need to pay any CE fees if I get the Network+ within the 3 years that my A+ is valid. They don't make it completely clear, spreading out the info around their website, but I think I've got it right.
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In the way that CompTIA's CE works, you're correct, every time you take another CompTIA exam that is considered equal to or more advanced level then your other CompTIA certifications will also renew.