100 Essential AWS Interview Questions

Amazon Web Services (AWS) is a comprehensive cloud computing platform offered by Amazon. It provides a mix of infrastructure as a service (IaaS), platform as a service (PaaS), and packaged software as a service (SaaS) offerings. AWS questions in a tech interview often assess a candidate’s understanding of cloud architecture, scalability, and stability. They can also evaluate a candidate’s ability to make effective use of AWS services to build and manage applications in the cloud. These questions serve to test the candidate’s competency in managing and designing systems on AWS, in the context of real-world scalability and performance requirements.

Content updated: April 19, 2024

AWS Fundamentals


  • 1.

    What is Amazon Web Services (AWS) and what are its key features?

    Answer:

    Amazon Web Services (AWS) is a cloud computing platform that offers a vast range of services, including computing power, storage, and databases, to help businesses scale and grow more cost-effectively.

    Key Features of AWS

    1. Scalability and Elasticity: AWS provides tools that allow for both vertical and horizontal scaling, as well as the ability to auto-scale based on demand.

    2. Global Reach: With data centers in multiple geographic regions, AWS enables businesses to operate on a global scale while remaining compliant with local regulations.

    3. Pay-As-You-Go Pricing: This flexible pricing model allows users to pay only for the resources they consume, reducing upfront costs.

    4. Security and Compliance: AWS offers a variety of security tools and features to help protect data, as well as compliance with numerous industry standards.

    5. Hybrid Capabilities: AWS supports hybrid architectures, allowing businesses to integrate their existing on-premises solutions with the cloud.

    6. Artificial Intelligence and Machine Learning: With AWS, businesses can harness the power of AI and ML through accessible services for data processing, analysis, and more.

    7. Developer Tools: From code repository management to continuous integration and deployment, AWS provides a comprehensive suite of developer-centric services.

    8. Internet of Things (IoT): AWS offers capabilities for managing and processing IoT data, connecting devices securely to the cloud.

  • 2.

    Explain the concept of Regions and Availability Zones in AWS.

    Answer:
  • 3.

    What is an Amazon Machine Image (AMI) and how is it used?

    Answer:
  • 4.

    Describe the difference between Elastic IP and Public IP in AWS.

    Answer:
  • 5.

    What is the role of the AWS Management Console?

    Answer:
  • 6.

    Explain the concept of Elastic Computing in AWS.

    Answer:
  • 7.

    What is AWS Identity and Access Management (IAM) and why is it important?

    Answer:
  • 8.

    Describe the AWS Shared Responsibility Model.

    Answer:
  • 9.

    What is the difference between Vertical Scaling and Horizontal Scaling in AWS?

    Answer:
  • 10.

    Explain the concept of High Availability in AWS.

    Answer:

Compute Services


  • 11.

    What is Amazon Elastic Compute Cloud (EC2) and what are its key features?

    Answer:
  • 12.

    Describe the different EC2 instance types and their use cases.

    Answer:
  • 13.

    What is Amazon Elastic Container Service (ECS) and how does it work?

    Answer:
  • 14.

    Explain the difference between Amazon EC2 and AWS Lambda.

    Answer:
  • 15.

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

    Answer:
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