Qualcomm interview questions

I interviewed with the Qualcomm R&D division for Software Engineer position. I was a summer intern there previously so had to give just 3 interviews. The first one consisted of coding on whiteboard: Stack & Queue operations, Encryption The second one had logical puzzles in it. The third one comprised of OO design in C++ , operating systems & networking questions ( sliding window protocol) In each of the 3 interviews I was asked in detail about my college projects