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AWS Interview Questions and Answers

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Interested in a career in the cloud industry? Get trained in the top computing platform AWS and prepare for the interview with the best collection of AWS interview questions.

Currently, the world is witnessing a substantial change in how organizations work. They are quickly digitizing their processes. The introduction of cloud computing has been a major driving force for this worldly transformation. Most businesses, these days, are using cloud computing for many of their operations. Thereby leading to a massive surge in the demand for cloud professionals.

It won’t be unfair to say that the opportunities are ample. However, there is a huge skills gap in this industry. Companies are not able to find the right candidates to work with them. This shortage has given rise to many great opportunities for those who are familiar with popular cloud platforms like AWS.

But to get into a large-scale IT company, you must well prepare to crack the interview. Here we have got you a set of AWS interview questions and their answers. We are sure these will help you in your preparation.

AWS cloud interview questions

As said, cloud platforms like AWS are taking today’s business scenarios by storm. As such, getting certified in that particular platform can offer you excellent career prospects. But, to get started with a career in AWS, you need to face interviews and ace them.

And to help you do that, here are some AWS interview questions along with their answers that will simplify your interview process. All the below given AWS interview questions and answers are scenario-based that test the depth of your knowledge.

AWS Basic Interview Questions

If you want to get into cloud computing, you must be aware of the following oftenly asked AWS interview questions and answers:

Q. What do you understand by AWS?

AWS or Amazon Web Services is the most comprehensive cloud computing platforms in the world. It offers the infrastructure to securely store, retrieve, manage data and other related operations without the need to have a physical server.

Q. What are the key components of AWS?

The key components of AWS are:

  • Simple E-mail Service that allows sending e-mail using RESTFUL API or via regular SMTP.
  • Route 53, which is a DNS web service.
  • Identity and Access Management, which offers identity management and enhanced security for AWS account.
  • Elastic Compute Cloud (EC2) offers on-demand computing resources for hosting applications. It becomes active during unexpected workloads.
  • Simple Storage Device or (S3) is the most widely used AWS storage device.
  • CloudWatch keeps an eye on AWS resources. In case of trouble, one can set a notification alarm. Also, it enables administrators to view and collect the key.
  • Elastic Block Store (EBS) provides persistent storage volumes that attach to EC2. This set up allows persisting data during the lifespan of a single Amazon EC2 instance.

Q. What is AMI?

Amazon Machine Image or AMI is a template that provides the resources (an operating system, an application server, and applications) required to launch an instance. This instance is a copy of the AMI running as a virtual server in the cloud. One can launch instances from a multiple numbers of different AMIs.

Q. What is S3?

Simple Storage Service or S3 is an interface used to store and retrieve any amount of data, at any time and from anywhere on the internet. The payment model for S3 is “pay as you go.”

Q. Is it possible to scale an Amazon instance vertically scale? If yes, how?

Yes, one can scale on Amazon instance vertically. The steps are:

  • Spin up a larger instance than your current one.
  • Keep that instance on the hole (pause). Detach the root webs volume from the server. Discard it.
  • Now stop the live instance and detach its root volume.
  • Pen down the unique device ID and attach that root volume to your new server.

Start the process again.

Q. What are storage classes in S3?

Each object in S3 is linked with some storage class. A storage class is used to assist the simultaneous loss of data in one or two facilities. Amazon S3 contains certain storage classes that allow storing objects. One can choose a storage class according to the requirements. Storage classes in S3 offer high durability.

AWS interview questions for freshers

Some of the frequently asked AWS interview questions and answers for freshers are:

Q. Why is buffer significant in AWS?

The primary role of an Elastic Load Balancer is to ensure that the incoming traffic is optimally distributed across various AWS instances. Here, a buffer will synchronize various components making the arrangement more elastic to accommodate load or traffic. Also, the components have a higher risk to work in an unbalanced way of receiving and processing requests. As such, the buffer creates equilibrium by linking different apparatus and make them work at an identical rate to source more rapid services.

Q. Why are subnets required?

Subnets are created to divide a large network into smaller ones. Several reasons could lead to the creating of these subnets. For example, subnets can help reduce congestion by ensuring that the traffic specific to a subnet reached and stays in that subnet. Subnets help in routing the traffic efficiently to the network reducing the load of the network.

Q. How can data be saved on root volume on an EBS-backed machine?

One can save the data on root volume by overriding the terminate option.

Q. Is there a way to upload a file greater than 100 megabytes in S3? What is the maximum number of S3 buckets you can create?

Yes, it is possible to upload a bigger file. You can do this by using multipart upload utility offered by AWS. Multipart upload utility allows larger files to be independently uploaded in multiple parts.

Also, one can decrease upload time by parallel uploading these parts. On the upload is completed, the parts are merged into a single file or object to create the original file from which the parts were created.

  • 50
  • 20
  • 70
  • 100

Q. What are key-pairs in AWS?

These are secure login information in the form of a public key and private key and are used to access your virtual machines. You can use key-pairs to connect to the instances.

Finding these AWS interview questions interesting? Try out our AWS Training Demo Class of you want to brush up your AWS skills. Contact us today!

AWS developer interview questions

The most often asked AWS interview questions and answers for developer are:

Q. What is AWS Lambda?

It is a computing service that runs code without managing servers. With Lambda, you need to pay only when your code is running.

Q. What is Cross-Region Replication?

It is a service that enables the replication of data from one bucket to another bucket. These buckets could be located in the same or different region. Cross-Region Replication offers asynchronous copying of objects. This means the objects are not copied immediately.

Q. What are Regions and Availability Zones?

Regions are the geographical areas that comprise 2 or more availability zones. It is a collection of data centres which are completely isolated from others.

An Availability Zone is a data centre located anywhere in the city or country. These can have multiple servers, firewalls, switches, and load balancing.

Q. What are EBS Volumes?

Elastic Block Store or EBS is a service that offers persistent block storage volume. These can be used with EC2 instances in the AWS cloud. EBS volume is replicated within its availability zone automatically to prevent component failure. Moreover, it provides availability, high durability, and low-latency performance required to run workloads.

Q. What is AMI? Can an AMI be shared?

AMI or Amazon Machine Image is a virtual image and is used to create a virtual machine within an EC2 instance. Yes, an AMI can be shared.

Q. What is Auto Scaling in AWS?

It is a feature that automatically scales the server capacity to maintain steady and foreseeable performance. Auto scaling allows you to scale multiple resources across multiple services in minutes. For those who are already using Amazon EC2 Autoscaling, they can combine Amazon EC2 Auto-Scaling with the Auto-Scaling to scale additional resources for other AWS services.

Benefits of Auto Scaling

  • Make Smart Scaling Decisions

  • It aids in making of scaling plans that automate the response of different resources to the changes. Auto Scaling optimizes the availability and cost and creates the scaling policies automatically. It sets the targets based on your preference. Moreover, it also monitors application and adds or removes the capacity automatically based on the requirements.

  • Setup Scaling Quickly

  • It sets the limit on the utilization of multiple resources in a single interface. Also, you do not have to move to a different console to see the average utilization level of multiple resources. Instead, you can see it on the same console.

  • Automatically maintain performance

  • Auto Scaling optimizes the application performance automatically and availability even when the workloads are uncertain. It continuously monitors your application to maintain the desired performance level. Also, Auto Scaling automatically scales the resources when the demand rises.

AWS interview questions and answers for experienced

Q. What is an EIP? Explain its concept.

Elastic IP address or EIP is a service offered by an EC2 instance. EIP is a static IP address attached to an EC2 instance. It is associated with your AWS account and not with an EC2 instance. It is possible to disassociate an EIP address from its EC2 instance and map it to another EC2 instance in an AWS account.

Let’s take an example. Suppose, the website points to the instance with a public IP address. Now, when the instance is reinitiated, the AWS takes another public IP address from the pool. This makes the previous public IP address invalid. Hence, the original link is no longer available between the website and the EC2 instance. To overcome such a situation, an EIP static IP address is used which does not change.

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

I would go for Amazon Glacier. It is an extremely low-cost storage service used for data archiving and backup purposes. It is an AWS offering. The longer you store data in Amazon Glacier, the lesser it will cost you.

Q. What is Amazon EMR?

It is a survived cluster stage which aids in interpreting the data structure working before the intimation. Services like Apache Hadoop and Apache Spark on AWS help you examine a large amount of data. One can prepare data to achieve the analytics goals and marketing intellect workloads using Apache Hive and using other relevant open-source designs.

AWS scenario based interview questions

Q. When the root volumes of store-backed and EBS-backed instances are terminated, the data on them get deleted by default. Which instances would you use to prevent that from happening?

The best instance to prevent such a situation is the EBS-backed instances since these use EBS volume as their root volume. These comprise virtual drives that can be easily backed up and duplicated through snapshots. With EBS-backed volumes, data can be configured to be stored for later retrieve even if the instances or virtual machine are shut down.

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

Yes. It is possible by using VPC (Virtual Private Cloud).

Q. Is it possible to launch a standby RDS in the same availability zone as the primary zone?

No. this is because standby instances are launched in different availability zones automatically. This makes them physically independent infrastructures. Since the purpose of standby instances is to prevent infrastructure failure, the standby instance will help recover all of the data in case the primary goes down.

Q. Can you use standby DB instances along with your primary DB instance if you are running your DB instance as Multi-AZ deployment?

No, because the standby DB instances are supposed to be used only if the primary instance goes down.

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

We can do this by configuring the bucket policy to offer public read access to all objects.

Q. What is the difference between Stopping and Terminating the instances?

Stopping means shutting down the instance. You can stop an EC2 instance. Here, the corresponding EBS volume is still attached to an EC2 instance allowing you to restart the instance later.


Terminating means removing the instance from the AWS account. You can also terminate the EC2 instance. When an instance is terminated, its corresponding EBS is also removed. As such, you cannot restart the EC2 instance in case of termination.

If you need any further assistance regarding AWS interview questions, feel free to contact experts at IQ Stream Technologies.

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