Cisco Senior Software Engineer interview questions

RD1 written test 4 questions hacker rank RD2: networking basics mostly l2 and l3 protocols RD3: Networking protocols and basic c Questions, linked lists RD4: Networking protocols and basic c Questions, linked lists RD5: It is scheduled as a manager round, asking mostly technical questions final feedback: my approach is not good for programming after 5 rounds including the manager round cisco got to know my approach is not good if my approach is not good why conduct this many rounds?