Cognizant Software Engineer Associate interview questions

difference between analog and digital how does internet work? wifi and bluetooth operations, pre emphasis and de emphasis. about time complexities in sorting algorithms. code for linear and binary search. protocols TCP,UDP,IP. what is mostly based on optical communication? how is a mobile call routed ,explain the process. why do you want to work for IT sector ?? difference between microprocessor and micro controller. practical example for counters. Any one recent trend in Digital electronics.