Cisco Software Engineer interview questions

Got a call from the HR representative. The representative given an overview about the job profile and the interview process. The interview was then scheduled and I received an email regarding the same. It was a full day interview consisting of 4 technical rounds. In the first round, I was asked to describe my current projects using whiteboard and markers. The interviewer had suggested some changes in the design and asked me how would I implement those design changes. The second round was about design patterns. In the third round, I was asked to write code in paper. The fourth round was about virtualization