1st Round:
Basic networking, oop, linux, sql related questions for an hour
2nd round: Networking, Switching, Routing, SDN, etc.. questions related to experience, experience with SDN, OPENFLOW, FPGA etc.
3rd Round: Software related questions, OOP, SQL, etc, don't remember
4th Round: Networking, Switching, Routing, SDN, etc.. questions related to experience, experience with SDN, OPENFLOW, FPGA etc.
5th Round: More behavioural questions and background related questions, explaining the nature of the job etc.