Developing on AWS Interview Question and Answer

Q1. What is AWS and why is it important in application development?

Answer: AWS (Amazon Web Services) is a cloud computing platform that offers a wide range of services for developing, deploying, and managing applications. It is important in application development as it provides scalability, flexibility, cost-effectiveness, and a robust infrastructure.

Q2. What are the core components of AWS?

Answer: The core components of AWS include EC2 (Elastic Compute Cloud), S3 (Simple Storage Service), Lambda, RDS (Relational Database Service), and VPC (Virtual Private Cloud).

Q3. How does AWS support application development?

Answer: AWS supports application development by providing various services and tools such as AWS SDKs, AWS CLI (Command Line Interface), AWS CloudFormation, AWS CodeDeploy, and AWS CodePipeline.

Q4. What is the difference between EC2 and Lambda?

Answer: EC2 is a virtual server in the cloud that allows you to run applications, while Lambda is a serverless computing service that lets you run code without provisioning or managing servers.

Q5. What is an AWS region and availability zone?

Answer: An AWS region is a geographic area where AWS data centers are located. Each region consists of multiple availability zones, which are isolated data centers within a region for redundancy and fault tolerance.

Q6. What is Elastic Beanstalk?

Answer: Elastic Beanstalk is a platform-as-a-service (PaaS) offering from AWS that allows developers to deploy and manage applications easily by handling the infrastructure provisioning and configuration.

Q7. What is Amazon S3 and how is it used in application development?

Answer: Amazon S3 is a scalable object storage service that allows you to store and retrieve data. It is commonly used in application development for storing static assets such as images, videos, and files.

Q8. How can you secure your applications on AWS?

Answer: You can secure your applications on AWS by using security groups, network ACLs (Access Control Lists), AWS Identity and Access Management (IAM), encryption, and implementing best practices for application security.

Q9. What is Auto Scaling in AWS?

Answer: Auto Scaling is a feature in AWS that allows you to automatically adjust the number of EC2 instances based on the demand for your application. It helps maintain optimal performance and cost efficiency.

Q10. How does AWS Lambda work?

Answer: AWS Lambda runs your code in response to events and automatically scales based on the incoming requests. It eliminates the need to provision or manage servers and allows you to focus on writing the application logic.

Q11. What is the difference between RDS and DynamoDB?

Answer: RDS is a managed relational database service that supports various database engines like MySQL, PostgreSQL, and Oracle. DynamoDB is a NoSQL database service provided by AWS that offers high scalability and performance.

Q12. How can you monitor your applications on AWS?

Answer: AWS provides various monitoring services such as CloudWatch, which allows you to collect and track metrics, set alarms, and generate log data for your applications. You can also use third-party monitoring tools.

Q13. What is AWS CloudFormation?

Answer: AWS CloudFormation is a service that allows you to provision and manage AWS resources using JSON or YAML templates. It helps in automating the infrastructure deployment process.

Q14. What is the difference between a public subnet and a private subnet in VPC?

Answer: A public subnet is accessible from the internet, while a private subnet is not directly accessible. Private subnets are used for resources that require internal communication and are often behind a NAT gateway.

Q15. How can you deploy your application on AWS?

Answer: You can deploy your application on AWS using various methods, such as manually configuring EC2 instances, using Elastic Beanstalk, using container services like ECS (Elastic Container Service) or EKS (Elastic Kubernetes Service), or using serverless technologies like AWS Lambda.

Q16. What is AWS CodePipeline?

Answer: AWS CodePipeline is a fully managed continuous integration and continuous delivery (CI/CD) service that helps you automate the release process of your applications.

Q17. How can you troubleshoot performance issues in AWS?

Answer: You can troubleshoot performance issues in AWS by monitoring resource utilization, analyzing logs, setting up alarms and notifications, using performance monitoring tools, and following best practices for optimizing performance.

Q18. What is the AWS Well-Architected Framework?

Answer: The AWS Well-Architected Framework is a set of best practices and guidelines provided by AWS to help you design and operate secure, high-performing, resilient, and efficient applications on the AWS platform.

Q19. How can you ensure high availability for your application on AWS?

Answer: You can ensure high availability by using multiple availability zones, implementing load balancing, using Auto Scaling to handle increased traffic, and designing your application to be fault-tolerant.

Q20. What are the cost considerations when developing on AWS?

Answer: Cost considerations include selecting the right instance types, optimizing resource utilization, leveraging cost-effective storage options, using reserved instances or savings plans, and regularly monitoring and optimizing costs.

Q21. How can you manage databases in AWS?

Answer: You can manage databases in AWS using services like Amazon RDS, Amazon Aurora, Amazon DynamoDB, or by setting up your own self-managed database instances on EC2.

Q22. What are the security best practices for AWS development?

Answer: Security best practices include implementing strong access controls, encrypting sensitive data, regularly patching and updating software, using secure protocols, monitoring for security threats, and following AWS security guidelines.

Q23. How can you scale your application on AWS?

Answer: You can scale your application on AWS by using Auto Scaling, load balancing, serverless computing, and leveraging managed services that automatically scale based on demand.

Q24. What is AWS CloudWatch and how is it used for monitoring?

Answer: AWS CloudWatch is a monitoring service that provides visibility into your AWS resources and applications. It allows you to collect and monitor metrics, create alarms, and gain insights into resource utilization and performance.

Q25. How can you optimize costs while developing on AWS?

Answer: You can optimize costs by using cost-effective resource allocation, leveraging spot instances, using cost allocation tags for resource grouping, regularly reviewing and optimizing resource utilization, and using cost optimization tools provided by AWS.