National Career Service Interview Questions, Process, and Tips

Q1. Java 8 What is Lamda Expression What is DI in spring
Ans. 
Lambda expression is a concise way to represent an anonymous function in Java 8. DI (Dependency Injection) is a design pattern used in Spring to manage object dependencies.
• Lambda expressions are used to implement functional interfaces with a single abstract method.

• DI in Spring allows for loose coupling between objects by injecting dependencies at runtime.

• Example of Lambda expression: (x, y) -> x + y

• Example of DI in Spr...read more
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Q2. What is Functional Interface
Ans. 
Functional Interface is an interface with only one abstract method.
• Functional Interface is used in Lambda expressions.

• It can have any number of default or static methods.

• Examples include Runnable, Comparator, and Callable interfaces.

• Functional Interface can be annotated with @FunctionalInterface annotation.
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Q3. What is oops concept
Ans. 
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 includes concepts like inheritance, polymorphism, encapsulation, and abstraction

• Examples of OOPs languages are Java, C++, Python, and Ruby
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The 90-minute test includes basic aptitude, verbal ability, followed by two data structure and algorithm questions.

Q1. What are the pillars of Object-Oriented Programming (OOP)?
Ans. 
OOP is based on four main pillars: Encapsulation, Abstraction, Inheritance, and Polymorphism, enhancing code modularity and reusability.
• Encapsulation: Bundling data and methods in a class. Example: A class 'Car' with properties like 'speed' and methods like 'accelerate()'.

• Abstraction: Hiding complex implementation details. Example: A 'Payment' interface that defines methods like 'processPayment()' without revealing the...read more
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Q2. What questions were asked regarding the OSI model in the context of computer networking?
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Q1. What are the steps to deploy an application to kubernetes?
Ans. 
Steps to deploy an application to Kubernetes
• Create a Kubernetes deployment file with specifications for the application

• Apply the deployment file using kubectl apply command

• Monitor the deployment using kubectl get pods command

• Expose the application using a Kubernetes service

• Scale the application by adjusting the replica count in the deployment file
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Q2. What are modules in terraform?
Ans. 
Modules in Terraform are reusable configurations that can be used to create multiple instances of resources.
• Modules help in organizing and reusing Terraform configurations.

• They allow for creating reusable components that can be shared across different projects.

• Modules can be used to encapsulate related resources and configurations.

• They promote code reusability and maintainability in Terraform scripts.
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Q3. Define stage in docker.
Ans. 
A stage in Docker is a logical division in a Dockerfile where a specific set of instructions are executed and the resulting image is saved.
• Stages help in breaking down complex build processes into smaller, manageable parts.

• Each stage can have its own base image and set of instructions.

• Stages can be used to optimize the build process by reusing intermediate images.

• Stages are defined using the 'FROM' keyword in a Dockerf
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Q4. What is CrashLoopBackOff
Ans. 
CrashLoopBackOff is an error state in Kubernetes when a container repeatedly crashes and fails to start.
• CrashLoopBackOff occurs when a container in a Kubernetes pod crashes and Kubernetes tries to restart it, but it keeps failing.

• This error is often caused by misconfigurations, resource constraints, or application bugs.

• To troubleshoot CrashLoopBackOff, check the container logs, resource limits, and pod configuration.

• Ex...read more
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Q5. What is NullResource in terraform.
Ans. 
NullResource in Terraform is a resource that performs no actions when applied, but can be used to trigger provisioners or other side effects.
• NullResource is a resource type in Terraform that allows you to run provisioners without creating any infrastructure.

• It can be used to trigger actions like running scripts or commands on the local machine or remote servers.

• NullResource is often used for tasks like running initiali...read more
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Q1. K8s architecture
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Q2. Modules in terrafrom
Ans. 
Modules in Terraform are reusable configurations that can be used to create resources in a consistent and efficient manner.
• Modules help in organizing and reusing Terraform configurations

• They can be used to create resources, manage infrastructure, and define policies

• Modules can be shared and reused across different projects

• Example: Creating a module for provisioning an AWS EC2 instance
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