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HP R & D Labs Interview Experience | Set 7 (For Experienced)

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I would like to share my recent interview experience with HP R&D Labs banglore. I have experience of 4 years into network protocol development. The opening position is for network protocol developer (Layer2/Layer3). Selected people were called for the drive. Totally, there are 5 rounds happened in a single day. (4 technical (1 written + 3 face to face), HR) Written test (objective): Questions in written test are to test the basic knowledge of C language and OS. Mainly stressed on bitwise operators, little endian and big endian. Technical Round 1: This round is completely for c . Interviewer has asked question on bitwise operator and linked lists. Memory layout of a c program. 1. How to set,unset and toggle bits using bitwise operators? 2. Stack implementation using linked lists? 3. Reversing of a linked list? 4. Memory layout of c program? How to findout the starting address of each segment (Data,stack,code)? I could clear the first round and called for the second round. Technical Round 2: In this round, interviewer evaluated my knowledge in network protocols and the work, Operating systems and C. After going through my resume, interviewer asked the protocol operations whichever i worked on and practical scenarios. Mostly stressed on operating systems. 1. Difference between semaphore and mutex? 2. What are race conditions? How to avoid them? 3. What is a dead lock? how to detect it? 4. What flavours of operating system were used in your projects? 5. What are x-factors of these operating systems? In C, 1. Swap two nodes of a linked list(not data)? 2. Malloc to allocate memory for 2-D array? 3.
int main() {
        chat *p=NULL;
Output of the above program? 4. What is a NULL pointer crash? how to detect it? 5. How memory leaks happen? how to find out them? Technical Round 3 (Manager+technical): This round was taken by the manager. He tried to test everything from C basics, networking, operating systems and software methodologies. And as expected, other questions from manager. HR round: This is the final round. Just a casual discussion happened regarding the notice period, hr questions, salary negotiations etc.

Last Updated : 27 Nov, 2017
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