Delta X Interview Questions and Answers

Aspiring software engineers seeking to crack the code of success at DeltaX, buckle up! This article dissects the interviews at DeltaX, offering an exclusive guide to the frequently asked questions across key technical areas: Data Structures and algorithms (DSA), Database Management Systems (DBMS), Object-Oriented Programming (OOP), Computer Networking (CN)and Operating Systems (OS). Whether you’re navigating complex tree traversals, crafting efficient SQL queries, mastering inheritance principles, or understanding memory management, this insider insight will equip you with the knowledge and confidence to conquer your DeltaX interview. Dive in, sharpen your skills, and get ready to ace your path to becoming a DeltaXian!

An Operating System(OS) is software that manages and handles the hardware and software resources of a computer system. It provides interaction between users of computers and computer hardware.

• Difference between contiguous and non-contiguous memory allocation.
• Compare and contrast synchronous and asynchronous I/O operations.
• Describe the benefits and drawbacks of thread pools in multithreaded programming.
• Different types of disk scheduling algorithms and their performance characteristics.
• How does paging work in virtual memory systems? What are the page table and TLB?
• Concept of system calls and their role in the interaction between user programs and the kernel.
• Discuss the various types of file system locks and their purpose in preventing data corruption.
• How does user authentication and authorization work in an operating system?
• Explain the advantages and limitations of different types of distributed file systems.

Database Management System is a software or technology used to manage data from a database. Some popular databases are MySQL, Oracle, MongoDB, etc.

• Explain the ACID properties of transactions and provide real-world examples.
• Differentiate between primary key, candidate key, and unique key.
• Write an efficient SQL query to find the top N highest salaries in a Employees table.
• Explain the concept of joins (inner, outer, left, right) and when to use each type.
• Discuss different types of database normalization (1NF, 2NF, 3NF) and their benefits.
• How would you handle concurrency issues in a database like deadlocks and lost updates?
• Explain the difference between B-Tree and Hash indexing and their performance implications.
• Advantages and disadvantages of NoSQL databases compared to traditional relational databases.
• Explain the concept of database transactions and isolation levels

A computer network is a collection of computers or devices connected to share resources. Any device which can share or receive the data is called a Node.

• Explain the difference between Unicasting, Anycasting, Multicasting, and Broadcasting.
• Describe the OSI Model and the different layers involved.
• What is the role of TCP and UDP protocols in data transmission?
• How does routing work in a network? Explain different routing protocols.
• Discuss the concept of subnetting and its benefits.
• Explain the working of DHCP and its importance in assigning IP addresses.
• What are firewalls and how do they protect networks from security threats?
• Describe different types of network attacks and methods to mitigate them.
• Explain the concept of virtual networks and their applications.
• Compare and contrast wired and wireless network technologies.

Object-oriented programming – As the name suggests uses objects in programming. Object-oriented programming aims to implement real-world entities like inheritance, hiding, polymorphism, etc. in programming.

• Explain the four pillars of object-oriented programming (OOP)
• Differentiate between classes and objects.
• Different types of inheritance (Single, Multilevel, Hierarchical, Hybrid)
• Different forms (Method Overloading and Overriding).
• Benefits and drawbacks of using abstract classes and interfaces.
• Explain the concept of access modifiers (public, private, protected) and their usage.
• Describe the difference between constructor and destructor
• Explain the concept of exception handling and its importance in error management.
• Discuss the difference between shallow copy and deep copy in object cloning.
• Concept of operator overloading and its applications in customizing operation behaviour.