Cisco Developer interview questions

The interviewer (hiring manager) called me on time. At first he asked me to introduce my background, and then asked questions related with my background. Actually, there are about 12 qualifications in their job description in which 11 qualifications I am very strong on. However, finally he said the remaining 1 qualification (1 front end programming language) is critical for the job. So I knew there wouldn't be an offer.

I first got a phone call and the my availability was asked after which a day for interview was fixed. interview lasted for around 50min. I was asked to code on a shared screen with webcam on. The interviewer was one of the member from the same team which had an open position. The interview started with a walk-through of my resume, and my interests. THe interviewer then narrated to me, what the team does. I was asked just one question and was allowed to code in the lang i preferred, though he told he would appreciate if it was C. I chose C itself as that was the language I was comfortable with. He put forward a problem which was more of a data-structure, design question and I tried solvin it slowly. He gave few tips me whenever and wherever i got stuck. It took 3 weeks, after which they responded with a reject.