Tree Tech interview questions

I applied through college or university. I interviewed at Huawei Technologies (Bangalore). It was lengthy.There were four rounds plus one written test.They ask you c++ data structures,OS,Networking basics,puzzles.For the written test you can prepare from some CAT exam questions.Rest of the interview was normal.Nothing difficult.Each interview round went on for about 1 hour.Never join the company as a contract member.