One of the easiest option to root galaxy note2 N7100 is with this app Framaroot.
Created by fellow xda member ALEPHZAIN.
You can find it here in xda of course.
Its not in Google Play store so look it up via google.Just type Framaroot and press search.
I've rooted using different ways before but the last time I rooted was with this app.Very efficient. Its just an app, open it theres 4 options,press aragon.You're rooted.
Sent from my GT-N7100 using xda premium
By SAMANTA- Google Patent Trolled by Rockstar
If you cant beat them on your own and with your own devices,take them to court and cross your fingers!