I have SM-P605. I think Knox bootloader is present from 4.3 onward. If SM-P600 has Knox app in the apps drawer and Knox security apps under Application manager then it's likely to have a Knox bootloader Tripping the Knox flag means the Knox container can never be accessed or used again but the phone/tablet itself is OK for regular use. I have not come across a phone/tablet with Knox apps and non-Knox bootloader.
Knox has been mentioned in this SM-P600 thread: http://forum.xda-developers.com/show....php?t=2618509