Tata Consultancy Services Interview Question

What They Ask: Core concepts: Data Structures: arrays, stacks, linked lists Algorithms: sorting, searching, recursion OOP: classes, inheritance, polymorphism DBMS: joins, normalization, SQL queries OS: processes, memory management CN: TCP/IP, OSI layers, protocols Hands-on Coding: Write code live (usually simple but correct) Debug or explain existing code Project Questions: What did you build? Tools used? Explain architecture, logic, challenges