Cognizant Program Analyst Trainee interview questions

My Interview went for 30 minutes. They told me to start with my Introduction and then ask my preferred language for coding. Then, We discuss the code which I wrote to check the validity of code for different scenarios. Rapid Fire round of Technical Question from different Subjects like OS, Networking, Microprocessors, DBMS, Data Structures, SD. At last, Do you have any Question for me?

The over all process consisted 3 rounds spanning over 2 days. The first round was an online test(aptitude+verbal+logical reasoning). The online test also contained 7 programming questions in which 3 were error correction and the rest 4 was easy problem solving. After the first round the short listed candidates take the interview on the next day. On the second the we had the technical interview first and the candidates clearing the tech interview will attend the HR interview.