The affect on "being smart", is being smart at your level, if an asperger has a technical prowess, h'ell be smart at that. He also might have economic or mathemistic skills.
You should realize that you need just as much system administrators to come up with a tax registration, as you would need bookkeepers to secure a wireless network.
The knowledge of "IP-spoofing", is used as an excuse in common media(overhere politicians use it when trying to explain the alterations on their wikipedia in their advantage and it has been traced back to their office PC, believing that everybody who does read it wouldn't understand that they are lying).
Something aspergers are very, very good at, is finding excuses for their behaviour. This means he knows it is tied to his computer somehow, but not that he knows how it works, what it is used for or how to alter it.