AWS Interview Questions

What is IAM in AWS? Explain Users, Groups, Roles, and Policies.

What is the difference between Security Groups and NACLs in AWS?

Explain VPC and its components — subnets, route tables, Internet Gateway.

What is the difference between S3 storage classes?

What is Auto Scaling in AWS? How does it work?

What are EC2 instance types and how do you choose the right one?

What are EBS volumes? Explain the different volume types.

What is Route 53? How does DNS routing work in AWS?

What is CloudFront and how does it work?

What is the difference between RDS and DynamoDB?

What is AWS Elastic Beanstalk and when should you use it?

What is the difference between SNS and SQS in AWS?

How do you use the AWS CLI effectively for DevOps tasks?

Explain AWS Regions and Availability Zones. How do they affect architecture?

What is an AWS tagging strategy and why does it matter?

How does AWS EKS differ from self-managed Kubernetes?

Explain AWS networking — what happens when you make a request to an EC2 instance?

What is AWS Lambda? What are its limitations?

What is IRSA (IAM Roles for Service Accounts) in EKS?

Explain Application Load Balancer (ALB) in depth — listeners, rules, and target groups.

Compare ECS and EKS — when should you use each?

What are AWS Organizations and Service Control Policies (SCPs)?

How do you set up effective monitoring with CloudWatch — metrics, alarms, and dashboards?

What is AWS Systems Manager and how is it used in operations?

What is ECR (Elastic Container Registry) and how do you use it in CI/CD?

What are AWS Step Functions and when should you use them?

What is Amazon EventBridge and how does it enable event-driven architectures?

Explain AWS Transit Gateway and its role in network architecture.

What are VPC Endpoints and why are they important?

How does ECS Fargate compare to EKS Fargate for serverless containers?

What is the role of Amazon EventBridge Scheduler and how does it replace CloudWatch Events for scheduled tasks?

How does AWS handle high availability and disaster recovery?

How do you design a cost-optimized AWS architecture?

Explain AWS CloudFormation vs Terraform for infrastructure as code.

How do you implement a secure CI/CD pipeline on AWS?

Explain the AWS Well-Architected Framework and its six pillars.

How do you design a multi-account strategy on AWS?

How do AWS Config and compliance automation work?

How do GuardDuty and Security Hub protect your AWS environment?

How do you implement cross-region disaster recovery on AWS?

How do you use Spot Instances effectively in production?

Explain AWS cost optimization in depth — beyond basic right-sizing.

How does EKS networking work with the VPC CNI plugin?

What are CloudFormation StackSets and how do you manage infrastructure across multiple accounts?

What is AWS PrivateLink and when should you use it?

How do you design serverless architecture patterns on AWS?

What are AWS service quotas and how do you manage them in production?

What is a Landing Zone and how does AWS Control Tower implement it?

How do you implement infrastructure compliance at scale using AWS Config, SCPs, and Config Rules together?

How do you architect a production-grade EKS cluster with security, networking, and observability best practices?