Infinera Software Engineer Networking interview questions

I applied through my college career site and was called up for an interview. The first round was a 1:1 HR round and basically covered my credentials and why I wanted to work for Infinera. They briefed me on the life of an employee at Infinera and several non-work events there. I was told they would get back to me by the end pof december. But they didnt. So I sent them a mail and I got the reply saying that I was not selected.