OSI model/TCP IP, types of attacks, port scanning. Reconnaissance.

Aptitude was easy only time limit was less so answer questions which you know confidently and try to guess rest if you are not sure. No Negative Markings. For GD round be confident and put forth your views clearly , Don't try to be harsh and don't shout . Remember its not a debate . If you don't speak a word you will be asked to conclude which means you don't have any chance for further shortlisting For final round just concentrate on your final year project and technologies which you have mentioned in your CV . They will ask all possible questions with regard to your current profile and you should be proficient to answer any of them