Top Important AWS Interview Questions and Answers (2025)

Preparing for an AWS interview in 2025 requires a solid understanding of core AWS services and emerging trends. Here's a breakdown of important question categories and examples, keeping in mind the evolving cloud landscape: AWS Training in Pune

I. Core AWS Services:

• EC2 (Elastic Compute Cloud):
  • "Explain the different EC2 instance types and when you would use each."
  • "What are the differences between On-Demand, Reserved, and Spot Instances?"
  • "How do you ensure high availability for an EC2-based application?" AWS Course in Pune
• S3 (Simple Storage Service):
  • "Describe the various S3 storage classes and their use cases."
  • "How do you secure data stored in S3?" AWS Classes in Pune
  • "Explain the concept of S3 versioning and its benefits."
• VPC (Virtual Private Cloud):
  • "Explain the components of a VPC, including subnets, route tables, and NAT gateways."
  • "How do you establish connectivity between an on-premises network and a VPC?"
  • "What are Network ACLs and Security Groups, and how do they differ?"
• RDS (Relational Database Service) and DynamoDB:
  • "What are the differences between RDS and DynamoDB, and when would you choose each?"
  • "Explain how to ensure high availability for an RDS database."
  • "Describe use cases for DynamoDB."
• Lambda:
  • "Explain the concept of serverless computing and how AWS Lambda works."
  • "What are the use cases for AWS Lambda?"
  • "How do you troubleshoot Lambda function performance issues?"

II. Emerging Trends:

• AI/ML:
  • "Describe your experience with Amazon SageMaker or Amazon Bedrock."
  • "How can AWS AI services be integrated into applications?"
  • "Explain the use of AWS Trainium and Inferentia."
• Containerization (EKS, ECS):
  • "Explain the differences between Amazon ECS and Amazon EKS."
  • "How do you deploy and manage containerized applications on AWS?"
  • "What are the benefits of using Kubernetes on AWS?"
• Serverless Architecture:
  • "Describe your experience with serverless architectures on AWS."
  • "How can you optimize costs in a serverless environment?"
  • "What are the challenges of serverless computing?"
• Security:
  • "How do you implement the principle of least privilege in AWS IAM?"
  • "Describe how you would secure a web application deployed on AWS."
  • "What are AWS security best practices?"
• DevOps:
  • "Explain how you would implement CI/CD pipelines on AWS."
  • "Describe your experience with AWS CloudFormation or AWS CDK."
  • "How do you monitor and log AWS resources?"
• Sustainability:
  • "How can AWS services be used to improve sustainability?"
  • "What are AWS's sustainability initiatives?"

III. General Cloud Concepts:

• "Explain the differences between IaaS, PaaS, and SaaS."
• "What are the benefits of cloud computing?"
• "Explain the concept of Availability Zones and Regions."

Tips for Success:

• Hands-on Experience: Practical experience with AWS services is crucial.
• AWS Certifications: Pursuing AWS certifications demonstrates your expertise.
• Stay Updated: Keep up with the latest AWS announcements and trends.
• Scenario-Based Questions: Be prepared to answer scenario-based questions that test your problem-solving skills.
• Understand Well Architected Framework: Be familiar with the AWS well architected framework.

By focusing on these areas, you'll be well-prepared for your AWS interview.