iSON Xperiences Big Data Engineer Interview Questions and Answers

A program to replace a character with another character in Java.

• Create a string variable with the original text

• Use the replace() method to replace the character with another character

• Print the new string with the replaced character

Program to print unique elements in an array in Java

• Create a HashSet to store unique elements

• Iterate through the array and add each element to the HashSet

• Print the HashSet to get the unique elements

Data structures are ways of organizing and storing data in a computer so that it can be accessed and used efficiently.

• Arrays - a collection of elements of the same type

• Linked Lists - a sequence of nodes where each node contains a reference to the next node

• Stacks - a collection of elements with two main operations: push (add) and pop (remove)

• Queues - a collection of elements with two main operations: enqueue (add) and d...read more

OOPs stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects.

• OOPs focuses on creating objects that contain both data and functions.

• It emphasizes on encapsulation, inheritance, and polymorphism.

• Examples of OOPs languages are Java, C++, Python, etc.

OOPs is used for creating modular, reusable and maintainable code.

• Encapsulation: Hiding implementation details and exposing only necessary information.

• Inheritance: Reusing code and creating a hierarchy of classes.

• Polymorphism: Using a single interface to represent multiple entities.

• Abstraction: Reducing complexity by hiding unnecessary details.

• Examples: Java, C++, Python, Ruby, etc.

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reuse and promotes code organization.

• The existing class is called the parent or superclass, and the new class is called the child or subclass.

• The child class inherits all the properties and methods of the parent class and can also add its own unique properties and ...read more

Polymorphism is the ability of an object to take on many forms.

• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A parent class Animal can have child classes like Dog, Cat, and Bird, each with their own unique implementation of the method 'makeSound'.

• Polymorphism makes code more flexible and reusable.

Abstraction is the process of hiding complex implementation details and exposing only the necessary information.

• Abstraction helps in reducing complexity and increasing efficiency.

• It allows us to focus on the essential features of an object or system.

• For example, a car can be abstracted as a vehicle with certain properties like speed, fuel efficiency, and seating capacity.

• Abstraction can be achieved through interfaces,

Encapsulation is the process of hiding implementation details and providing a public interface for accessing the functionality.

• Encapsulation helps in achieving data abstraction and information hiding

• It prevents unauthorized access to the internal details of an object

• It allows for easy modification of implementation without affecting the external code

• Example: A class with private variables and public methods

• Example: A b...read more

RAID stands for Redundant Array of Independent Disks. It is a data storage technology that combines multiple physical disks into a single logical unit.

• RAID provides improved performance, fault tolerance, and data protection.

• There are different levels of RAID, including RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10.

• RAID 0 offers improved performance but no redundancy, while RAID 1 provides redundancy but no performance im...read more

FSMO stands for Flexible Single Master Operations. It is a role in Active Directory that controls specific domain-wide operations.

• There are five FSMO roles: Schema Master, Domain Naming Master, RID Master, PDC Emulator, and Infrastructure Master.

• Each FSMO role is responsible for a specific operation within the Active Directory domain.

• For example, the PDC Emulator role is responsible for time synchronization and passwor...read more

iDRAC stands for Integrated Dell Remote Access Controller. It is a hardware and software solution for remote server management.

• iDRAC allows administrators to remotely manage and monitor Dell servers.

• It provides features such as power management, virtual media access, and console redirection.

• iDRAC can be accessed through a web interface or command line interface.

• It is available on most Dell PowerEdge servers.

• iDRAC can b...read more

DNS stands for Domain Name System. It is a system that translates domain names into IP addresses.

• DNS is like a phonebook for the internet

• It helps to locate websites by translating domain names into IP addresses

• DNS servers store information about domain names and their corresponding IP addresses

• DNS can also be used for other purposes like email routing and network diagnostics

DHCP stands for Dynamic Host Configuration Protocol. It is a network protocol that automatically assigns IP addresses to devices on a network.

• DHCP is used to simplify network administration by automatically assigning IP addresses to devices on a network.

• It allows devices to join a network and obtain an IP address without manual configuration.

• DHCP servers can also provide additional network configuration information, su...read more