Cisco Software Developer interview questions

1 phone interview, 6 hours of interview onsite Decent interview.. Focus on C, memory concepts, Distributed systems , O.S , algorithms. 1 interview with manager, rest with with tech lead.. took entire day.. Flow in from south Ca, to north CA, Decent experience

first round was an aptitude round which consisted of both technical and quantz. Quantz questions were relatively easy. Technical questions were very difficult. Second round was a technical round but it was a teleconference interview and it didnt go well. Was asked questions on linux and its code.