The correct root file for N7100 Android 4.4.2 is not a magic single file. It is a combination : Odin + TWRP + SuperSU/Magisk. Bookmark this guide, download only from trusted sources (linked above), and your decade-old Note 2 will serve you for years to come.
Several tools facilitate the rooting process, with Odin being one of the most popular for Samsung devices. Odin allows users to flash the root file onto their device. Other tools and software, like KingoRoot, might offer a more straightforward, one-click rooting process, but they might not always support every device or software version. samsung n7100 root file 4.4.2 download