they asked all about digital and analog electronics along with network theory que. C programming is must for this role. for this role strong aptitude is mandatory and reasoning skills as well

it is of 3 rounds 1st round was written test about reasoning, basic C and bitwise. 2nd round was technical again some basic questions in C, Protocols and some linux command. 3rd round was also Technical a bit advanced in C asked some programs based on arrays and Protocols.