Cognizant Fullstack Developer Intern Interview Questions and Answers

Q1. Demonstrate Function Overriding.
Ans. 
Function Overriding is a concept in object-oriented programming where a subclass provides a specific implementation of a method that is already provided by its parent class.
• In Function Overriding, a subclass can provide a specific implementation of a method that is already defined in its parent class.

• The method in the subclass must have the same name, return type, and parameters as the method in the parent class to ove...read more
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Q2. Linq query with order by
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Using LINQ query to order data in C#
• Use the OrderBy method to sort data in ascending order

• Use the OrderByDescending method to sort data in descending order

• You can also use ThenBy and ThenByDescending for secondary sorting
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Q3. What is Out Parameter with example
Ans. 
Out parameter is used to pass data out of a method or function.
• Out parameters are used when a method needs to return multiple values.

• They are declared using the 'out' keyword in C#.

• Example: void CalculateArea(int length, int width, out int area) { area = length * width; }
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Q4. Authentication and autherization, JWT Tocken
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Q5. Reflection in C#
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Reflection in C# allows for inspecting and manipulating metadata of types at runtime.
• Reflection is used to dynamically create instances of types, access properties, and invoke methods.

• Examples include using reflection to load assemblies at runtime, inspect attributes of types, and generate code dynamically.

• Reflection can be slow and should be used judiciously due to performance overhead.
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Q1. Where are Logic App logs stored?
Ans. 
Logic App logs are stored in Azure Monitor Logs (formerly known as Log Analytics).
• Logic App logs are stored in Azure Monitor Logs, which is a centralized log storage and analytics service in Azure.

• Logs can be viewed and analyzed using Azure Monitor Logs queries.

• Logs can also be integrated with other Azure services for monitoring and alerting purposes.
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Q2. How to get the 5th top position data in Sql?
Ans. 
Use the OFFSET and FETCH clauses in SQL to get the 5th top position data.
• Use the ORDER BY clause to sort the data in descending order.

• Use the OFFSET clause to skip the first 4 rows.

• Use the FETCH clause to retrieve only the next row after skipping the first 4 rows.
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Q3. How do you implement custom middleware in .net core?
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Custom middleware in .NET Core can be implemented by creating a class that implements the IMiddleware interface and adding it to the application pipeline.
• Create a class that implements the IMiddleware interface

• Implement the InvokeAsync method in the middleware class to handle the request processing logic

• Add the custom middleware to the application pipeline in the Configure method of the Startup class
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Q4. Explain Authentication & Authorization in asp.net core?
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Authentication verifies the identity of a user, while authorization determines what resources a user can access.
• Authentication confirms the identity of a user through credentials like username and password.

• Authorization determines the permissions and access levels of a user based on their authenticated identity.

• In ASP.NET Core, authentication is handled through middleware like Identity, OAuth, or JWT tokens.

• Authorizati...read more
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Q5. Explain session management in asp.net core?
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Session management in ASP.NET Core involves storing and retrieving user-specific data during a user's visit to a website.
• Session data is stored on the server side by default in ASP.NET Core

• Session data can be accessed and manipulated using the HttpContext.Session property

• Session data can be configured to use different storage providers such as in-memory, distributed cache, or SQL Server

• Session data is typically used to...read more
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Def factorial_iterative(n):
result = 1
for i in range(1, n + 1):
result *= i
return result

Q1. Java overloading overriding differences
Ans. 
Overloading is having multiple methods with the same name but different parameters, while overriding is implementing a method in a subclass with the same signature as in the superclass.
• Overloading allows different methods to have the same name but different parameters.

• Overriding involves implementing a method in a subclass with the same signature as in the superclass.

• Overloading is determined at compile time based on t...read more
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Q2. Angular decorators
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Q3. Angular services
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Q1. Tell me about internal working of JVM
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Q2. Tell me about SAGA pattern in Microservices
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SAGA pattern is a design pattern used in microservices architecture to manage distributed transactions.
• SAGA pattern breaks down a long-running transaction into a series of smaller, independent transactions.

• Each step in the SAGA pattern is a separate service that communicates with other services through events.

• If a step fails, compensating transactions are executed to rollback the changes made by previous steps.

• Example:...read more
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Q1. Tell me about your current project structure
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Q2. What is an API , how would you secure an API
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API stands for Application Programming Interface. It defines the methods and data formats that applications can use to communicate with each other.
• API is a set of rules and protocols that allows different software applications to communicate with each other.

• To secure an API, you can use authentication methods like OAuth, API keys, or JWT tokens.

• Implementing encryption (HTTPS) and rate limiting can also enhance API secu...read more
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Q1. Why do you want to relocate to Bangalore
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Q2. Tell me about one instance where you faced pressure and how did you overcome ?
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Q1. Basic js question on hoisting, closure, promises
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Q1. Basic resume based
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Q1. Salary discussion -- HR never responded
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Q1. Java Basic questions
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Q2. SpringBoot Basic questions
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Q3. Simple DSA problem: "introduction" find duplicate characters
Ans. 
Find duplicate characters in a given array of strings
• Iterate through each string in the array

• For each string, iterate through each character and store the count in a hashmap

• If the count of any character is greater than 1, it is a duplicate
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Q4. Write code for REST API using spring boot, include all annotation
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Code for REST API using Spring Boot with annotations
• Use @RestController annotation to define the class as a REST controller

• Use @RequestMapping annotation to map HTTP requests to handler methods

• Use @GetMapping, @PostMapping, @PutMapping, @DeleteMapping annotations for specific HTTP methods

• Use @PathVariable annotation to extract values from the URI

• Use @RequestBody annotation to bind HTTP request body to a method paramete
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Q1. 1. What is resolvers in angular 2. Difference between canActivated and CanGuard route guards in angular 3. How to create custom decorators 4. what is use of ngOnInit 3. How to make asynchronous method to s...read more
Ans. 
Resolvers in Angular are used to fetch data before the component is loaded, canActivate guards control access to routes, custom decorators can be created using @Decorator syntax, ngOnInit is a lifecycle hook in Angular, asynchronous methods can be made synchronous using async/await, cancellation tokens are used to cancel asynchronous operations.
• Resolvers in Angular are used to fetch data before the component is loaded,...read more
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