Top 30 AWS Interview Questions And Answers

These questions are designed to test your understanding of core AWS concepts and services. The specific questions you encounter in an interview may vary depending on the role and company.

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

  1. 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.
  2. 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.
  3. 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
  4. 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.  
  5. Explain the concept of a load balancer in AWS.

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

Advanced Topics

  1. 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. 
  1. What is AWS Kinesis?
  • Kinesis is a real-time data processing service that can handle massive amounts of data streams.
  1. Explain the difference between a public and private subnet.
  • A public subnet has internet connectivity, while a private subnet does not.
  1. What is AWS Glue?
  • Glue is a serverless ETL (Extract, Transform, Load) service that helps you prepare and analyze data.
  1. 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

  1. 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
  1. How do you ensure high availability in AWS?
  • Use multiple availability zones, load balancers, and auto-scaling to improve availability.
  1. What is AWS CloudFormation?
  • CloudFormation is a service that allows you to define and manage a collection of AWS resources using a template.
  1. 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.
  1. What are some common security pitfalls to avoid in AWS?
  • Avoid sharing credentials, use strong passwords, and implement proper access controls.

Additional Questions

  1. What is AWS Step Functions?
  • Step Functions is a serverless workflow service that helps you coordinate and automate complex workflows.
  1. 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.
  1. What is AWS CodePipeline?
  • CodePipeline is a continuous delivery service that automates the release process for your applications.
  1. 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.
  1. What is AWS Amplify?
  • Amplify is a framework that simplifies the development and deployment of web and mobile applications.

Advanced Topics (Continued)

  1. 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.
  1. What is AWS Outposts?
  • Outposts brings AWS infrastructure on-premises, enabling you to run applications and workloads in your own data center.
  1. 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.
  1. What is AWS Athena?
  • Athena is a serverless query engine that allows you to query data stored in S3 using standard SQL.
  1. 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.

shivani Salavi

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