OS internals, Threads Safety, Windows Drivers , C++ and JAVA theoretical questions. Program to rotate a matrix. which language is preferred , C++, JAVA or C#. describe your projects: more interested in distributed systems project, asked about producer and consumer problem. difference in thread and Process, PCB structure, Deadlock, any experience with Bluetooth APIs, Encryption, Cryptography algorithms, Asymmetric and symmetric key algorithms. which one is faster ?