Cisco Full Stack Software Engineer interview questions

Applied through online job portal of Cisco. They send me to link to Hackerank coding test. The test consist of 5 algorithmic questions which are very easy. But need to be very fast since we will be having 15 mins for each questions. After that F2F interview happened in cisco bangalore office. The interview was very easy and panellists were asking simple questions only. Everything went well, but they rejected my profile without telling any reason.