20+ Redserv Global Solutions Interview Questions and Answers

The problem involves determining if there exists a triplet in an array such that the sums of specific subarrays are equal.

• Iterate through all possible triplets (i, j, k) satisfying the given conditions.

• Calculate the sum of subarrays [0, i - 1], [i + 1, j - 1], [j + 1, k - 1], [k + 1, N - 1] for each triplet.

• Check if any triplet has equal sums for the subarrays, return True if found, else False.

Generic collections provide type safety and reusability in software development.

• Generic collections allow us to store and manipulate objects of any type in a type-safe manner.

• They provide compile-time type checking, reducing the chances of runtime errors.

• They promote code reusability by allowing the same collection to be used with different types.

• Generic collections improve performance by eliminating the need for boxing and unboxing operations.

• They enable us to write cleaner ...read more

One way SSL is unidirectional while two way SSL is bidirectional.

• One way SSL only authenticates the server to the client while two way SSL authenticates both the server and the client to each other.

• One way SSL uses only server certificate while two way SSL uses both server and client certificates.

• One way SSL is commonly used in websites while two way SSL is used in applications that require higher security such as online banking.

• One way SSL is vulnerable to man-in-the-middle ...read more

SOAP is a protocol while REST is an architectural style for web services.

• SOAP uses XML for messaging while REST uses JSON or XML.

• SOAP requires more bandwidth and processing power than REST.

• SOAP has built-in error handling while REST relies on HTTP error codes.

• SOAP supports both stateful and stateless communication while REST is stateless.

• SOAP is commonly used in enterprise applications while REST is used for web-based applications.

• Example of SOAP: Web Services Description Lan...read more

Public key is used for encryption and private key is used for decryption.

• Public key is shared with others to encrypt messages.

• Private key is kept secret and used to decrypt messages.

• Public key is used in digital signatures to verify authenticity.

• Examples include RSA, DSA, and Elliptic Curve Cryptography.

• Public key is longer than private key for added security.

Public cloud is accessible to everyone while private cloud is restricted to a specific organization.

• Public cloud is owned and operated by third-party providers while private cloud is owned and operated by the organization itself.

• Public cloud is accessible over the internet while private cloud is accessible only within the organization's network.

• Public cloud is more cost-effective for small businesses while private cloud is more secure for large enterprises.

• Examples of public ...read more

SSL can be configured at HTTP layer by enabling HTTPS protocol and configuring SSL certificates.

• Enable HTTPS protocol in web server configuration

• Generate or obtain SSL certificates

• Configure SSL certificates in web server

• Ensure secure communication between client and server

• Test SSL configuration for any vulnerabilities

REST supports methods like GET, POST, PUT, DELETE, PATCH, OPTIONS, HEAD.

• GET - retrieves a resource

• POST - creates a new resource

• PUT - updates an existing resource

• DELETE - deletes a resource

• PATCH - partially updates a resource

• OPTIONS - returns the supported methods for a resource

• HEAD - returns metadata about a resource

Cloud refers to the delivery of computing services over the internet.

• Cloud computing allows users to access data and applications from anywhere with an internet connection.

• It offers scalability, flexibility, and cost-effectiveness compared to traditional on-premises computing.

• Examples of cloud services include Amazon Web Services, Microsoft Azure, and Google Cloud Platform.

Multiple dispatch is not a feature of Redux. It can be achieved using middleware or custom logic.

• Middleware like redux-thunk or redux-saga can be used to dispatch multiple actions based on a single action.

• Custom logic can be implemented in the reducer to handle multiple actions based on a single action type.

• For example, a single 'ADD_ITEM' action can trigger multiple actions like 'UPDATE_TOTAL', 'UPDATE_HISTORY', etc.

• Multiple dispatch can also be achieved using the 'redux-bat...read more

OAuth 2.0 is used for secure authorization and authentication in various applications.

• OAuth 2.0 is used by Google to allow third-party applications to access user data without sharing passwords.

• It is used by Facebook to allow users to log in to other websites using their Facebook credentials.

• It is used by Microsoft to allow users to grant access to their Office 365 data to third-party applications.

• OAuth 2.0 is also used in mobile applications to authenticate users and access ...read more

Use XOR operation to find the missing number in an array of integers.

• Iterate through the array and XOR all the elements with their indices.

• Then XOR the result with the indices from 0 to n.

• The final result will be the missing number.

Various exceptions can occur in PL/SQL, such as NO_DATA_FOUND, TOO_MANY_ROWS, and INVALID_CURSOR.

• NO_DATA_FOUND exception is raised when a SELECT INTO statement returns no rows.

• TOO_MANY_ROWS exception is raised when a SELECT INTO statement returns multiple rows.

• INVALID_CURSOR exception is raised when an invalid cursor operation is performed.

I use various design tools such as Adobe XD, Sketch, Figma, and InVision for designing user interfaces.

• Adobe XD

• Sketch

• Figma

• InVision

OOPs is a programming paradigm based on the concept of objects, which can contain data and code.

• OOPs stands for Object-Oriented Programming.

• It focuses on creating objects that interact with each other to solve a problem.

• It has four main concepts: Encapsulation, Inheritance, Polymorphism, and Abstraction.

• Encapsulation is the process of hiding data and methods within a class.

• Inheritance allows a class to inherit properties and methods from another class.

• Polymorphism allows obje...read more

Database structure design involves identifying entities, relationships, attributes, and normalization.

• Identify entities and their relationships

• Define attributes for each entity

• Normalize the database to reduce redundancy

• Consider indexing for efficient querying

• Use primary and foreign keys to establish relationships

• Choose appropriate data types for each attribute

String buffer is mutable while string builder is not. String builder is faster but not thread-safe.

• String buffer is synchronized and thread-safe, while string builder is not.

• String builder is faster than string buffer because it is not synchronized.

• String buffer is mutable, meaning it can be changed after creation, while string builder is immutable.

• Example: StringBuffer sb = new StringBuffer(); StringBuilder sb = new StringBuilder();

OAuth 2.0 is an authorization framework that allows third-party applications to access user data without sharing passwords.

• OAuth 2.0 is used for authentication and authorization.

• It allows users to grant access to their resources stored on one site to another site.

• It uses access tokens to grant access to resources.

• Examples of OAuth 2.0 providers include Google, Facebook, and Twitter.

Postgres query for grouping data based on a specific column.

• Use the GROUP BY clause in your query

• Specify the column you want to group by in the GROUP BY clause

• Aggregate functions like COUNT, SUM, AVG can be used with GROUP BY

• Example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name

Yes, you can deactivate in Angular using the ngIf directive.

• Use ngIf directive to conditionally show or hide elements in Angular templates.

• Set the condition to false to deactivate the element.

• Example:

  Content

Polymorphism is the ability of an object to take on many forms. It allows objects of different classes to be treated as the same type.

• Polymorphism allows a single interface to be used for different types of objects.

• It helps in achieving code reusability and flexibility.

• Polymorphism can be achieved through method overriding and method overloading.

• Example: A 'Shape' class can have different subclasses like 'Circle', 'Rectangle', and 'Triangle', all implementing a 'draw' method.