Lets face it - @CiscoNetAcad is a mind expanding drug ...
Taking the CCNA (Cisco Certified Networking Associate) is a step into the unknown and a step way beyond all that you thought you could do. You think you know networking - then give this a try. It makes and breaks and has made grown men (and of course women) cry.
Fact after fact, technology galore - making networks talk it is a case of more upon more. By the time you have completed Introduction to Networks - your synapses are fused, what seems like hell is only the start of your head being abused.
As you discover each new technology and manage to get it to work - it does become obsessive as you internetwork. If you do not understand this - ask a Cisco geek or give it a try. It has made careers for many, it is worth it, do not be shy.