#1 Son is almost all the way through his Cisco CCNA book, and we're getting ready for him to actually take the exam. He still has a little trouble with subnetting/route aggregation, but that means he's not converting the IP addresses into binary (everything becomes simple then).
But as a reminder to my readers who may be looking to break into an industry that has high pay, if you are a bit technical this is something that you can do, too. No need for fancy College (or the tuition for same).
Here are some posts I've done on the subject:
Why and how to teach yourself security
Free Technical Education