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Top Amazon AWS Interview Questions – Most Asked

AWS Interview Question
If you are going for an AWS interview, then this experts-prepared list of AWS interview questions is all you need to get through it. AWS Course will help you gain expertise in cloud architecture, starting, stopping, and terminating an AWS instance, comparing between Amazon Machine Image and an instance, auto-scaling, vertical scalability, AWS security, and more. This AWS interview questions are designed for all the professionals who are interested to learn about Cloud Computing, and they will help you in your career path which is aimed at pursuing various cloud job profiles like AWS Solution Architect, AWS Engineer, DevOps Engineer, Cloud Architect, etc.

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Top Answers to AWS Interview Questions

Basic Questions

Advanced Questions

1. Compare AWS and OpenStack
LicenseAmazon proprietaryOpen Source
Operating SystemWhatever cloud administrator providesWhatever AMIs provided by AWS
Performing repeatable operationsThrough templatesThrough text files
2. What is AWS?

AWS (Amazon Web Services) is a platform to provide secure cloud services, database storage, offerings to compute power, content delivery, and other services to help business level and develop.

Learn more about AWS in this insightful AWS Tutorial!

3. What is the importance of buffer in Amazon Web Services?

An Elastic Load Balancer ensures that the incoming traffic is distributed optimally across various AWS instances.  A buffer will synchronize different components and makes the arrangement additional elastic to a burst of load or traffic. The components are prone to work in an unstable way of receiving and processing the requests. The buffer creates the equilibrium linking various apparatus and crafts them effort at the identical rate to supply more rapid services.


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4. How are Spot Instance, On-demand Instance, and Reserved Instance different from one another?

Both Spot Instance and on-demand instances are models for pricing.

Spot InstancesOn-demand Instances
With Spot Instance, customers can purchase compute capacity with no upfront commitment at all.


With On-demand Instance, users can launch instances at any time based on the demand.


Spot Instances are spare Amazon instances that you can bid for.


On-demand Instances are suitable for high-availability needs of applications.


When the bidding price exceeds the spot price, the instance is automatically launched, and the spot price fluctuates based on supply and demand for instances.


On-demand Instances are launched by users only with pay-as-you-go model.


When the bidding price is less than the spot price, the instance is immediately taken away by Amazon.


On-demand Instances will remain persistent without any automatic termination from Amazon.


Spot Instances are charged at an hourly basis.On-demand Instances are charged at a per-second basis
5. Your organization has decided to have all their workload on the public cloud. But, due to certain security concerns, your organization decided to distribute some of the workload on private servers. You are asked to suggest a cloud architecture for your organization. What would be your suggestion?

Hybrid Cloud. Hybrid cloud architecture is where an organization can use the public cloud for shared resources and the private cloud for their confidential workloads.

6. The data on the root volumes of the Instance store-backed and EBS-backed instances get deleted by default when the instances are terminated. If you had to prevent that from happening, which instance would you use?

EBS-backed instances. EBS-backed instances use EBS volume as their root volume. EBS volume consists of virtual drives that can be easily backed up and duplicated by snapshots. The biggest advantage of EBS-backed volumes are that the data can be configured to be stored for later retrieval even if the virtual machine or the instances are shut down.

7. Which one of the storage solutions offered by AWS would you use if you need extremely low pricing and data archiving?

Amazon Glacier. AWS Glacier is an extremely low-cost storage service offered by Amazon that is used for data archiving and backup purposes. The longer you store data in Glacier, the lesser it will cost you.

8. You have connected four instances to ELB. To automatically terminate your unhealthy instances and replace them with new ones, which functionality would you use?

Auto scaling groups

9. How will you configure an Amazon S3 bucket to serve static assets for your public web application?

By configuring the bucket policy to provide public read access to all objects.

10. Your organization wants to send and receive compliance emails to their clients using their own email address and domain. What service would you suggest for achieving the same in an easy and cost-effective way?

Amazon Simple Email Service (Amazon SES) which is a cloud-based email sending service.

11. Can you launch Amazon Elastic Compute Cloud (EC2) instances with predetermined private IP addresses? If yes, then using which Amazon service?

Yes. By using VPC, Virtual Private Cloud.

12. Why do we make subnets?

Creating subnets means dividing a large network into smaller ones, namely subnets. These subnets can be created for several reasons. For example, creating and using subnets can help reduce congestion by making sure that the traffic destined for a subnet stays in that subnet. This helps in efficiently routing the traffic coming to your network which helps reduce the network’s load.

13. If you launched a standby RDS, will it be launched in the same availability zone as your primary?

No, standby instances are automatically launched in different availability zone than the primary, making it a physically independent infrastructure. This is because the whole purpose of standby instances is to prevent infrastructure failure. So, in case the primary goes down, standby instance will help recover all of the data.

14. Which of the following is a global Content Delivery Network service that securely delivers data to users with low latency and high transfer speed.

Amazon CloudFront

15. Which Amazon solution will you use if you had to accelerate moving petabytes of data in and out of AWS, using storage devices that are designed to be secure for data transfer?

Amazon Snowball. AWS Snowball is the data transport solution for large amounts of data to be moved into and out of AWS using physical storage devices.

16. If you are running your DB instance as Multi-AZ deployment, can you use standby DB instances along with your primary DB instance?

No, standby DB instance cannot be used along with primary DB instances since standby DB instances are supposed to be used only if the primary instance goes down.

17. Your organization is developing a new multi-tier web application in AWS. Being a fairly new and small organization, there’s limited staff. But, they require high availability. This new application comprises complex queries and table joins. Which Amazon service will be the best solution for your organization’s requirements?

DynamoDB will be the right choice here since it is designed to be highly scalable, more than RDS or any other relational database services.

18. Your organization is using DynamoDB for its application. This application collects data from its users every 10 minutes and stores it in DynamoDB. Then every day, after a particular time interval, the data (respective to each user) is extracted from DynamoDB and sent to S3. Then, the application visualizes this data to the users. You are asked to propose a solution to help optimize the backend of the application for latency and at lower cost. What would you recommend?

ElastiCache. Amazon ElastiCache is a caching solution offered by Amazon. It can be used to store a cached version of the application in a region closer to users so that when requests are made by the users the cached version of the application can respond, and hence latency will be reduced.

19. You accidently stopped an EC2 instance in a VPC with an associated Elastic IP. If you start the instance again, what will be the result?

The data on the instance store will be lost. Elastic IP is disassociated from the instance only if the instance is terminated.

20. Your organization has around 50 IAM users. Now, they want to introduce a new policy that will affect the access permissions of an IAM user. How can they implement this without having to apply the policy at the individual user level?

By using IAM groups and adding users in the groups as per their roles. Then, simply apply the policy to the groups.

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