Foundational Concepts

1. What is AWS?

   • AWS (Amazon Web Services) is a comprehensive cloud computing platform that offers a wide range of services, including compute, storage, database, networking, analytics, and machine learning.  AWS Training in Pune
      

2. Explain the difference between EC2 and Lambda.

   • EC2 (Elastic Compute Cloud) provides virtual servers for running applications. Lambda is a serverless computing service that allows you to run code without managing servers.

3. What is S3 and how does it work?

   • S3 (Simple Storage Service) is an object storage service that allows you to store and retrieve any amount of data from anywhere. It uses a key-value pair system for storage and retrieval.   
      

4. Describe the difference between a VPC and a subnet.

   • A VPC (Virtual Private Cloud) is a private cloud within the AWS public cloud. A subnet is a division of a VPC that defines a range of IP addresses.

5. What is IAM and why is it important?

   • IAM (Identity and Access Management) is a service that allows you to manage user identities and permissions in AWS. It is crucial for security and compliance.

Core Services

6. Explain the concept of auto-scaling in AWS.

   • Auto-scaling automatically adjusts the number of EC2 instances based on demand, ensuring optimal performance and cost-efficiency.

7. What is RDS and how does it differ from DynamoDB?

   • RDS (Relational Database Service) is a managed relational database service. DynamoDB is a managed NoSQL database service.

8. How do you ensure data security in AWS?

   • You can use various security measures, such as encryption, access controls, and IAM policies, to protect your data in AWS. AWS Classes in Pune

9. What is AWS Elastic Beanstalk?

   • Elastic Beanstalk is a platform as a service (PaaS) that simplifies the deployment and management of web applications and services.  
      

10. Explain the concept of a load balancer in AWS.

• A load balancer distributes traffic across multiple instances to improve performance and availability.

Advanced Topics

11. What is AWS Lambda's cold start? How can you optimize for it?

• A cold start occurs when a Lambda function is invoked for the first time after a period of inactivity. You can optimize for cold starts by using caching or keeping functions warm. 

12. What is AWS Kinesis?

• Kinesis is a real-time data processing service that can handle massive amounts of data streams.

13. Explain the difference between a public and private subnet.

• A public subnet has internet connectivity, while a private subnet does not.

14. What is AWS Glue?

• Glue is a serverless ETL (Extract, Transform, Load) service that helps you prepare and analyze data.

15. How do you implement a continuous delivery pipeline using AWS services?

• You can use services like CodeCommit, CodePipeline, CodeBuild, and CodeDeploy to create a continuous delivery pipeline.

Best Practices

16. What are some best practices for cost optimization in AWS?

• Use reserved instances, spot instances, and on-demand pricing appropriately. Monitor usage and shut down unused resources. AWS Course in Pune

17. How do you ensure high availability in AWS?

• Use multiple availability zones, load balancers, and auto-scaling to improve availability.

18. What is AWS CloudFormation?

• CloudFormation is a service that allows you to define and manage a collection of AWS resources using a template.

19. How do you troubleshoot performance issues in an AWS application?

• Use CloudWatch metrics, X-Ray tracing, and performance testing tools to identify and resolve performance bottlenecks.

20. What are some common security pitfalls to avoid in AWS?

• Avoid sharing credentials, use strong passwords, and implement proper access controls.

Additional Questions

21. What is AWS Step Functions?

• Step Functions is a serverless workflow service that helps you coordinate and automate complex workflows.

22. Explain the concept of a serverless architecture.

• A serverless architecture allows you to build applications without managing servers. AWS Lambda and API Gateway are key components of serverless architectures.

23. What is AWS CodePipeline?

• CodePipeline is a continuous delivery service that automates the release process for your applications.

24. How do you implement a multi-tier architecture in AWS?

• A multi-tier architecture typically consists of a presentation layer, application layer, and data layer. You can use EC2, S3, and RDS to implement these layers.

25. What is AWS Amplify?

• Amplify is a framework that simplifies the development and deployment of web and mobile applications.

Advanced Topics (Continued)

26. Explain the difference between a database instance and a database cluster in RDS.

• A database instance is a single database server. A database cluster is a group of database instances that provide high availability and scalability.

27. What is AWS Outposts?

• Outposts brings AWS infrastructure on-premises, enabling you to run applications and workloads in your own data center.

28. How do you implement a hybrid cloud architecture using AWS?

• A hybrid cloud architecture combines on-premises infrastructure with AWS services. You can use AWS Outposts or VPN connections to connect your on-premises environment to AWS.

29. What is AWS Athena?

• Athena is a serverless query engine that allows you to query data stored in S3 using standard SQL.

30. Explain the concept of a serverless API.

• A serverless API is an API that is managed and scaled automatically by AWS. You can create serverless APIs using API Gateway and Lambda.