The questions depends on the interviewer.First they took a brief introduction me and then they asked me questions related to cpp. The question was to create a 2d pointer and write code by myself.Then they asked oops,os,dsa basic questions. Then he gave me 2 DSA questions.The first one was validating an IP address and second was to a rearrange a linked list.I was rejected after round 1.

General HR questions.Why Zscaler and everything was asked.I couldn't make it that's why I don't have a clear idea.

Tips: Prepare DSA and Computer fundamentals properly.Its a plus point to have a good knowledge of computer networks.