Amazon Software Development Engineer AWS Security interview questions

I got response from recruiters 3 weeks after I applied for AMZ. However I went on vacation, therefore I asked them to re-schedule dates. After I came back from vacation, I attended the interview. Intial questions are simple like how does your day-2-day work look like, tell about a project you are stumbled upon etc. After that came the tough coding section. 1. Find duplicate element in array (1 - (n-1)). I explained a bucket based approach. However it requires extra storage. 2. Find phone number in directory of 10,000 files 3. Explain ssh protocol