Top 113 AWS Interview Questions and Answers for 2025 (Updated Guide)

Complete AWS Interview Questions Guide for 2025

AWS (Amazon Web Services) has become the leading cloud platform, making AWS skills essential for modern software engineering roles. Whether you're interviewing for a cloud engineer, DevOps engineer, solutions architect, or general software developer position, this comprehensive guide covers 113+ AWS interview questions you need to master.

AWS Interview Question Categories

1. AWS Fundamentals (Questions 1-25)

Basic AWS Concepts

Q1: What is AWS and what are its key benefits?

AWS is Amazon's cloud computing platform offering 200+ services including computing, storage, networking, databases, analytics, and machine learning. Key benefits include scalability, cost-effectiveness, global reach, security, and managed services.

Q2: Explain the difference between Public, Private, and Hybrid clouds.

Public cloud resources are owned and operated by cloud providers like AWS. Private cloud is dedicated to a single organization. Hybrid cloud combines both public and private cloud environments.

Q3: What are AWS Regions and Availability Zones?

Regions are separate geographic areas with multiple isolated locations called Availability Zones (AZs). Each AZ has independent power, cooling, and networking to ensure fault tolerance.

Q4: What is the difference between Scalability and Elasticity?

Scalability is the ability to handle increased load by adding resources. Elasticity is the ability to automatically scale resources up or down based on demand.

Q5: Explain AWS Global Infrastructure.

AWS has 31+ regions, 99+ availability zones, 400+ edge locations, and 13+ regional edge caches worldwide. This provides low latency, high availability, and fault tolerance.

2. EC2 and Computing (Questions 26-45)

Q26: What is Amazon EC2?

EC2 (Elastic Compute Cloud) provides resizable compute capacity in the cloud. It offers virtual servers with various instance types optimized for different use cases.

Q27: Explain different EC2 instance types.

• General Purpose: t3, m5 - Balanced CPU, memory, networking
• Compute Optimized: c5 - High-performance processors
• Memory Optimized: r5, x1 - Large datasets in memory
• Storage Optimized: i3, d2 - High sequential read/write
• Accelerated Computing: p3, g4 - GPU workloads

Q28: What are the different EC2 pricing models?

• On-Demand: Pay per hour/second with no commitment
• Reserved Instances: 1-3 year commitment with discount
• Spot Instances: Bid for unused capacity at lower prices
• Dedicated Hosts: Physical servers dedicated to your use

3. Storage Services (Questions 46-65)

Q46: Compare S3, EBS, and EFS storage services.

• S3: Object storage, web accessible, virtually unlimited
• EBS: Block storage, attached to EC2, high performance
• EFS: File storage, POSIX-compliant, shared across instances

Q47: What are S3 storage classes?

• Standard: Frequently accessed data
• Standard-IA: Infrequently accessed data
• One Zone-IA: Less critical, infrequent data
• Glacier: Archive storage, minutes to hours retrieval
• Glacier Deep Archive: Long-term archive, 12 hour retrieval

4. Networking (Questions 66-85)

Q66: What is Amazon VPC?

VPC (Virtual Private Cloud) lets you provision a logically isolated section of AWS cloud where you can launch resources in a virtual network you define.

Q67: Explain Subnets, Route Tables, and Internet Gateways.

• Subnets: Range of IP addresses in your VPC
• Route Tables: Rules determining network traffic direction
• Internet Gateway: Allows internet access to/from VPC

Q68: What is the difference between Security Groups and NACLs?

• Security Groups: Instance-level, stateful, allow rules only
• NACLs: Subnet-level, stateless, allow and deny rules

5. Databases (Questions 86-100)

Q86: Compare RDS, DynamoDB, and Redshift.

• RDS: Managed relational databases (MySQL, PostgreSQL, etc.)
• DynamoDB: Managed NoSQL database, serverless
• Redshift: Data warehouse, analytics, petabyte scale

Q87: What is RDS Multi-AZ deployment?

Multi-AZ provides high availability by maintaining a standby replica in a different AZ. Automatic failover occurs if the primary database fails.

6. Security and Compliance (Questions 101-113)

Q101: Explain AWS IAM components.

• Users: Individual people or applications
• Groups: Collection of users with shared permissions
• Roles: Set of permissions for AWS services
• Policies: JSON documents defining permissions

Q102: What is AWS CloudTrail?

CloudTrail provides governance, compliance, operational auditing, and risk auditing by logging API calls made in your AWS account.

Advanced AWS Concepts

Serverless Architecture

AWS Lambda: Run code without provisioning servers. Event-driven, auto-scaling, pay-per-execution pricing model.

API Gateway: Create, publish, maintain, monitor, and secure APIs at any scale. Integrates with Lambda for serverless applications.

Container Services

ECS (Elastic Container Service): Fully managed container orchestration service supporting Docker containers.

EKS (Elastic Kubernetes Service): Managed Kubernetes service that makes it easy to run Kubernetes on AWS.

DevOps and Automation

CloudFormation: Infrastructure as Code service that helps model and provision AWS resources.

CodePipeline: Continuous integration and continuous delivery service for fast and reliable application updates.

How InterviewCodeAssist Helps with AWS Interviews

Technical Question Support

• Real-time answers to complex AWS architecture questions
• Detailed explanations of AWS services and their use cases
• Comparison between different AWS solutions
• Best practices and architectural patterns

Scenario-Based Problem Solving

• Architecture design for specific business requirements
• Cost optimization strategies
• Security and compliance solutions
• Disaster recovery and high availability planning

Code Examples and Configuration

• CloudFormation templates for common scenarios
• Lambda function code examples
• IAM policy configurations
• CLI commands and scripts

Common AWS Interview Scenarios

Scenario 1: High-Traffic Web Application

Question: Design a scalable web application architecture for millions of users.

Solution: Use ALB, Auto Scaling Groups, ECS/EKS, RDS with read replicas, ElastiCache, CloudFront CDN, and Route 53.

Scenario 2: Data Analytics Pipeline

Question: Build a real-time data processing pipeline.

Solution: Kinesis Data Streams, Lambda for processing, S3 for storage, Redshift for analytics, and QuickSight for visualization.

Scenario 3: Disaster Recovery

Question: Implement disaster recovery for critical applications.

Solution: Multi-region deployment, RDS cross-region backups, S3 cross-region replication, and Route 53 health checks.

AWS Certification Preparation

Popular AWS Certifications

• Cloud Practitioner: Foundational understanding
• Solutions Architect Associate: Designing distributed systems
• Developer Associate: Developing and maintaining applications
• SysOps Administrator: Operating systems on AWS

Preparation Strategy

1. Hands-on practice with AWS Free Tier
2. Official AWS training courses
3. Practice exams and study guides
4. Real-world projects and case studies
5. InterviewCodeAssist for interview preparation

Success Tips for AWS Interviews

Technical Preparation

• Understand core AWS services deeply
• Practice architectural design exercises
• Know pricing models and cost optimization
• Understand security best practices
• Be familiar with monitoring and troubleshooting

Communication Tips

• Ask clarifying questions about requirements
• Explain your thought process clearly
• Consider trade-offs and alternatives
• Mention monitoring and security considerations
• Use InterviewCodeAssist for complex scenarios

Ready to Ace Your AWS Interview?

AWS interviews require deep technical knowledge, practical experience, and the ability to solve complex architectural problems. While studying and hands-on practice are essential, having InterviewCodeAssist as your companion ensures you can handle any AWS question thrown your way.

Whether you're interviewing for a cloud architect, DevOps engineer, or developer role, InterviewCodeAssist provides real-time support for technical questions, architectural decisions, and best practices that will impress your interviewers.

Start your AWS interview preparation with InterviewCodeAssist today and join developers who've successfully landed roles at top companies. Your cloud career advancement starts here!