AWS Interview Questions 2025
Basic AWS Concepts
- What is AWS, and how does it benefit businesses?
- Define cloud computing and its essential characteristics.
- Differentiate between IaaS, PaaS, and SaaS.
- What is the AWS Free Tier, and what services does it include?
- Explain the concept of AWS Regions and Availability Zones.
- What is an AWS Edge Location?
- Describe the Shared Responsibility Model in AWS.
- What are AWS Service Limits?
- How does AWS ensure data security and compliance?
- What is the AWS Well-Architected Framework?
Compute Services
- What is Amazon EC2, and what are its primary features?
- Describe the different EC2 instance types.
- What is the difference between stopping and terminating an EC2 instance?
- Explain EC2 pricing models: On-Demand, Reserved, and Spot Instances.
- What is Auto Scaling, and how does it work?
- Describe Elastic Load Balancing and its types.
- What is AWS Lambda, and when should it be used?
- Compare AWS Lambda with EC2.
- What is AWS Elastic Beanstalk?
- How does AWS Fargate differ from ECS?
Storage Services
- What is Amazon S3, and what are its storage classes?
- Explain the concept of S3 buckets and objects.
- How does versioning work in S3?
- What is Amazon EBS, and how does it differ from S3?
- Describe the types of EBS volumes available.
- What is Amazon EFS, and when should it be used?
- How does AWS Storage Gateway facilitate hybrid cloud storage?
- What is Amazon Glacier, and what use cases does it serve?
- Explain the concept of lifecycle policies in S3.
- What is AWS Snowball, and when is it used?
Database Services
- What is Amazon RDS, and which databases does it support?
- Describe the benefits of using Amazon Aurora.
- What is Amazon DynamoDB, and what are its primary features?
- How does DynamoDB ensure consistency?
- What is Amazon Redshift, and when should it be used?
- Explain the purpose of Amazon ElastiCache.
- What is Amazon Neptune, and what type of databases does it support?
- How does AWS Database Migration Service (DMS) work?
- What is Amazon DocumentDB?
- Describe the concept of read replicas in RDS.
Networking Services
- What is Amazon VPC, and why is it used?
- Explain the components of a VPC.
- What are subnets, and how do they differ from VPCs?
- Describe the purpose of Internet Gateways and NAT Gateways.
- What are Security Groups and Network ACLs?
- How does AWS Direct Connect differ from VPN connections?
- What is Amazon Route 53, and what are its routing policies?
- Explain the concept of Elastic IP addresses.
- What is AWS Global Accelerator?
- How does VPC Peering work?
Security and Identity Services
- What is AWS IAM, and what are its key components?
- Describe the difference between IAM roles and IAM users.
- What are IAM policies, and how are they structured?
- Explain the concept of Multi-Factor Authentication (MFA) in AWS.
- What is AWS KMS, and how does it manage encryption keys?
- How does AWS CloudHSM differ from KMS?
- What is AWS Secrets Manager?
- Describe the purpose of AWS Shield.
- What is AWS WAF, and how does it protect applications?
- How does AWS Config help in compliance management?
Monitoring and Logging
- What is Amazon CloudWatch, and what metrics can it monitor?
- How do CloudWatch Alarms work?
- What is AWS CloudTrail, and what information does it provide?
- Describe the purpose of AWS Trusted Advisor.
- How does AWS X-Ray help in application debugging?
- What is AWS Control Tower?
- How do you set up log retention policies in AWS?
- Explain AWS Config and its use cases.
- What is AWS GuardDuty?
- How does AWS Security Hub improve security monitoring?
Application Integration
- What is Amazon SQS, and how does it work?
- Explain the difference between SQS Standard and FIFO queues.
- What is Amazon SNS?
- Describe Amazon EventBridge and its use cases.
- What is AWS Step Functions?
- What is AWS App Mesh?
- How does AWS API Gateway work?
- Explain AWS Kinesis and its use cases.
- What is AWS Glue, and when should it be used?
- Describe AWS Data Pipeline.
DevOps and Automation
- What is AWS CodePipeline?
- Describe AWS CodeBuild.
- What is AWS CodeDeploy?
- How does AWS CloudFormation help in infrastructure as code (IaC)?
- What is AWS CDK (Cloud Development Kit)?
- How does AWS OpsWorks work?
- Explain the role of AWS Systems Manager.
- What is AWS Elastic Beanstalk?
- How does AWS Config enable infrastructure automation?
- What are AWS Deployment Strategies?
Big Data and Analytics
- What is AWS Glue, and how does it differ from AWS Data Pipeline?
- Explain the key features of Amazon EMR.
- What is AWS Athena?
- What is Amazon QuickSight?
- Describe the purpose of AWS Data Lake.
- What is AWS Lake Formation?
- How does AWS Redshift Spectrum work?
- What is AWS Kinesis Firehose?
- What are the use cases of AWS Glue DataBrew?
- How does AWS Quicksight compare to Tableau?
Machine Learning and AI
- What is Amazon SageMaker?
- How does AWS Rekognition work?
- Explain the purpose of AWS Polly.
- What is AWS Lex?
- Describe AWS Translate and its features.
- What is AWS Comprehend?
- How does AWS Personalize work?
- What is AWS Forecast?
- How does AWS Deep Learning AMI help developers?
- What is AWS Inferentia?
Serverless & Containers
- What is AWS App Runner?
- How does AWS Fargate compare to ECS?
- Explain AWS Lambda Layers.
- How does AWS Lambda interact with DynamoDB?
- What is AWS Lambda Destinations?
- How do you monitor AWS Lambda performance?
- Explain AWS Step Functions’ role in serverless workflows.
- What is AWS App Mesh?
- How do you optimize AWS Lambda cold start times?
- What is AWS Proton?
AWS Certification and Best Practices
- What AWS certifications are available?
- How do you prepare for AWS Certified Solutions Architect?
- What is AWS Well-Architected Tool?
- Explain the concept of AWS Landing Zone.
- What is the AWS Free Tier, and how long does it last?
- What are best practices for securing AWS environments?
- How do you optimize AWS cost using AWS Cost Explorer?
- What is AWS Budgets?
- Explain AWS Savings Plans.
- What is AWS Compute Optimizer?
Advanced AWS Topics
- How do you design multi-region AWS architectures?
- What is AWS Transit Gateway?
- How do you migrate workloads using AWS Application Migration Service?
- What are AWS best practices for disaster recovery?
- Explain AWS Outposts.
- What is AWS Local Zones?
- How do you secure a multi-account AWS environment?
- Explain AWS Service Quotas.
- How does AWS Marketplace work?
- What is AWS ParallelCluster?