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Round 2: 2 Interviewers took this round. Both were polite and positive. Was asked,There are millions of servers and databases, how will I detect whether files which are present in DB are original or they have been tempered by any virus or other means. This question was a bouncer for me, I was clueless but with full confidence I started my design and eventually proceeded. Then was asked to make a directory, just like we have in windows ("C:/{folder}/{files}). Achieved this with trees, and further was asked some questions on this. Rating for this round (6/10).