Cisco

There were three technical rounds and one system design round. The interviewers were nice and had positive responses throughout all stages, but I didn't receive an offer. They want you to be a good communicator.

Consists of three rounds of in-person (face-to-face) interviews. First round: C and data structure questions and basic networking questions. Second round: OS concepts and IPC mechanisms. Third round: Networking concepts and design questions.

I was contacted by a recruiter who forwarded my details to a hiring manager. That hiring manager contacted me and, after some introductory chat, asked me to solve a code challenge. I completed the code challenge, which took about 4 hours of my time.