Cisco Developer interview questions

Got an onsite at San Jose, 4 rounds interview, talked about the resume, basic questions about OOP concepts, computer networks, data structure, algorithms and some front end stuff. The interviewers are polite and patience. But there's NO feedback after the interview even though it's about a month from then and they do NOT reply the email.

The recruiter setup a phone screen. This was an hour long and the interviewer asked me about OS, Data structures, OOPS and gave ma problem to solve. Then there was an onsite round which consisted of more DS and algorithm problems. Varied from Binary trees, recursion and Algorithms. Final round with the manager in which he asked me about previous learning experiences, career expectations, project management etc.