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Top 50 AWS Interview Questions and Answers with Dimensionless

Top 50 AWS Interview Questions and Answers with Dimensionless


Launched back in 2006, AWS has succeeded in becoming the leading provider of on-demand cloud computing services. The cloud computing services provider secures a staggering 32% of the cloud computing market share up until the last quarter of 2018.

Every aspiring developer looking to make it big in the cloud computing ecosphere must have a stronghold on AWS. If you’re eyeing for the role of an AWS Developer, then these most important 20 AWS interview questions will help you take a step further towards your desired job avenue. So let us kickstart your AWS learning with Dimensionless!

AWS Interview Questions with Answers

1. What is AWS?

AWS attains as Amazon Web Service; this is a gathering of remote computing settings also identified as cloud computing policies. This unique realm of cloud computing is also recognized as IaaS or Infrastructure as a Service.

2. What are the Key Components of AWS?

The fundamental elements of AWS are

  • Route 53: A DNS web service
  • *Easy E-mail Service: It permits addressing e-mail utilizing RESTFUL API request or through normal SMTP
  • *Identity and Access Management: It gives heightened protection and identity control for your AWS account
  • *Simple Storage Device or (S3): It is warehouse equipment and the well-known widely utilized AWS service
  • *Elastic Compute Cloud (EC2): It affords on-demand computing sources for hosting purposes. It is extremely valuable in trouble of variable workloads
  • *Elastic Block Store (EBS): It presents persistent storage masses that connect to EC2 to enable you to endure data beyond the lifespan of a particular EC2
  • *CloudWatch: To observe AWS sources, It permits managers to inspect and obtain key Additionally, one can produce a notification alert in the state of crisis.


3. What is S3?

S3 holds for Simple Storage Service. You can utilize S3 interface to save and recover the unspecified volume of data, at any time and from everywhere on the web. For S3, the payment type is “pay as you go”.

4. 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.

5. What Does an AMI Include?

An AMI comprises the following elements:

  1. A template to the source quantity concerning the instance
  2. Launch authorities determine which AWS accounts can avail the AMI to drive instances
  3. A base design mapping that defines the amounts to join to the instance while it is originated.

6. How Can You Send the Request to Amazon S3?

Amazon S3 is a REST service, you can transmit the appeal by applying the REST API or the AWS SDK wrapper archives that envelop the underlying Amazon S3 REST API.

7. How many Buckets can you Create in AWS by Default?

In each of your AWS accounts, by default, You can produce up to 100 buckets.

8. List the Component Required to Build Amazon VPC?

Subnet, Internet Gateway, NAT Gateway, HW VPN Connection, Virtual Private Gateway, Customer Gateway, Router, Peering Connection, VPC Endpoint for S3, Egress-only Internet Gateway.

9. What is the Way to Secure Data for Carrying in the Cloud?

One thing must be ensured that no one should seize the information in the cloud while data is moving from point one to another and also there should not be any leakage with the security key from several storerooms in the cloud. Segregation of information from additional companies’ information and then encrypting it by means of approved methods is one of the options.

10. Name the Several Layers of Cloud Computing?

Here is the list of layers of the cloud computing

PaaS — Platform as a Service
IaaS — Infrastructure as a Service
SaaS — Software as a Service

11. Explain- Can You Vertically Scale an Amazon Instance? How?

  • Surely, you can vertically estimate on Amazon instance.
  • Twist up a fresh massive instance than the one you are currently governing
  • Delay that instance and separate the source webs mass of server and dispatch
  • Next, quit your existing instance and separate its source quantity
  • Note the different machine ID and connect that source mass to your fresh server

12. What are the Components Involved in Amazon Web Services?

There are 4 components involved and areas below. Amazon S3: with this, one can retrieve the key information which are occupied in creating cloud structural design and amount of produced information also can be stored in this component that is the consequence of the key specified. Amazon EC2 instance: helpful to run a large distributed system on the Hadoop cluster. Automatic parallelization and job scheduling can be achieved by this component.

Amazon SQS: this component acts as a mediator between different controllers. Also worn for cushioning requirements those are obtained by the manager of Amazon.

Amazon SimpleDB: helps in storing the transitional position log and the errands executed by the consumers.

13. What is Lambda@edge in Aws?

  • In AWS, we can use Lambda@Edge utility to solve the problem of low network latency for end users.
  • In Lambda@Edge there is no need to provision or manage servers. We can just upload our Node.js code to AWS Lambda and create functions that will be triggered on CloudFront requests.
  • When a request for content is received by CloudFront edge location, the Lambda code is ready to execute.
  • This is a very good option for scaling up the operations in CloudFront without managing servers.

14. Distinguish Between Scalability and Flexibility?

The aptitude of any scheme to enhance the tasks on hand on its present hardware resources to grip inconsistency in command is known as scalability. The capability of a scheme to augment the tasks on hand on its present and supplementary hardware property is recognized as flexibility, hence enabling the industry to convene command devoid of putting in the infrastructure at all. AWS has several configuration management solutions for AWS scalability, flexibility, availability and management.

15. Name the Various Layers of the Cloud Architecture?

There are 5 layers and are listed below

  • CC- Cluster Controller
  • SC- Storage Controller
  • CLC- Cloud Controller
  • Walrus
  • NC- Node Controller

16. What is the Difference Between Azure and AWS?

AWS and Azure are subsets in terms of cloud computing. Both are used to build and host applications. Azure helped many companies, such as the platform, such as PaaS. … Storage: – AWS has temporary storage that is assigned when an instance is started and destroyed when the instance is terminated.

17. Explain- What is T2 Instances?

T2 instances are outlined to present average baseline execution and the ability to explode to powerful execution as needed by the workload.

18. In VPC with Private and Public Subnets, Database Servers should ideally be launched into which Subnet?

Among private and public subnets in VPC, database servers should ideally originate toward separate subnets.

19. What is AWS SageMaker?

Amazon SageMaker is a fully managed machine learning service. With Amazon SageMaker, data scientists and developers can quickly and easily build and train machine learning models, and then directly deploy them into a production-ready hosted environment. It provides an integrated Jupyter authoring notebook instance for easy access to your data sources for exploration and analysis, so you don’t have to manage servers. It also provides common machine learning algorithms that are optimized to run efficiently against extremely large data in a distributed environment.

20. While Connecting to your Instance What are the Possible Connection Issues one Might Face?

  • The feasible connection failures one might battle while correlating instances are
  • Consolidation timed out
  • User key not acknowledged by the server
  • Host key not detected, license denied
  • The unguarded private key file
  • Server rejected our key or No sustained authentication program available
  • Error handling Mind Term on Safari Browser
  • Error utilizing Mac OS X RDP Client

21. Explain Elastic Block Storage? What Type of Performance can you Expect? How do you Back itUp? How do you Improve Performance?

That indicates it is RAID warehouse to begin with, so it’s irrelevant and faults tolerant. If disks expire in the RAID you don’t miss data. Excellent! It is more virtualized, therefore you can provision and designate warehouse, and connect it to your server with multiple API appeals. No calling the storage specialist and asking him or her to operate specific requests from the hardware vendor.

Execution of EBS can manifest variability. Such signifies that can run above the SLA enforcement level, suddenly descend under it. The SLA gives you among a medium disk I/O speed you can foresee. That can prevent any groups particularly performance specialists who suspect stable and compatible disk throughput on a server. Common physically entertained servers perform that direction. Pragmatic AWS cases do not.

Backup EBS masses by utilizing the snap convenience through API proposal or by a GUI interface same elasticfox.

Progress execution by practising Linux software invasion and striping over four extents.

22. Which Automation Gears can Help with Spinup Services?

The API tools can be used for spinup services and also for the written scripts. Those scripts could be coded in Perl, bash or other languages of your preference. There is one more option that is patterned administration and stipulating tools such as a dummy or improved descendant. A tool called Scalr can also be used and finally, we can go with a controlled explanation like a RightScale.

23. What is an Ami? How Do I Build One?

AMI holds for Amazon Machine Image. It is efficiently a snap of the source filesystem. Products appliance servers have a bio that shows the master drive report of the initial slice on a disk. A disk form though can lie anyplace physically on a disc, so Linux can boot from an absolute position on the EBS warehouse interface.

Create a unique AMI at beginning rotating up and instance from a granted AMI. Later uniting combinations and components as needed. Comprise wary of setting delicate data over an AMI (learn salesforce online). For instance, your way credentials should be joined to an instance later spinup. Among a database, mount an external volume that carries your MySQL data next spinup actually enough.

24. What are the Main Features of Amazon Cloud Front?

Some of the main features of Amazon CloudFront are as follows: Device Detection Protocol Detection Geo Targeting Cache Behavior Cross-Origin Resource Sharing Multiple Origin Servers HTTP Cookies Query String Parameters Custom SSL.

25. What is the Relation Between an Instance and Ami?

AMI can be elaborated as Amazon Machine Image, basically, a template consisting software configuration part. For example an OS, applications, application server. If you start an instance, a duplicate of the AMI in a row as an unspoken attendant in the cloud.

26. What is Amazon Ec2 Service?

Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides resizable (scalable) computing capacity in the cloud. You can use Amazon EC2 to launch as many virtual servers you need. In Amazon EC2 you can configure security and networking as well as manage storage. Amazon EC2 service also helps in obtaining and configuring capacity using minimal friction.

27. What are the Features of the Amazon Ec2 Service?

As the Amazon EC2 service is a cloud service so it has all the cloud features. Amazon EC2 provides the following features:

  • The virtual computing environment (known as instances)
  • re-configured templates for your instances (known as Amazon Machine Images — AMIs)
  • Amazon Machine Images (AMIs) is a complete package that you need for your server (including the operating system and additional software)
  • Amazon EC2 provides various configurations of CPU, memory, storage and networking capacity for your instances (known as instance type)
  • Secure login information for your instances using key pairs (AWS stores the public key and you can store the private key in a secure place)
  • Storage volumes of temporary data are deleted when you stop or terminate your instance (known as instance store volumes)
  • Amazon EC2 provides persistent storage volumes (using Amazon Elastic Block Store — EBS)
  • A firewall that enables you to specify the protocols, ports, and source IP ranges that can reach your instances using security groups
  • Static IP addresses for dynamic cloud computing (known as Elastic IP address)
  • Amazon EC2 provides metadata (known as tags)
  • Amazon EC2 provides virtual networks that are logically isolated from the rest of the AWS cloud, and that you can optionally connect to your own network (known as virtual private clouds — VPCs)

28. What is the AWS Kinesis

Amazon Kinesis Data Streams can collect and process large streams of data records in real time. You can create data-processing applications, known as Kinesis Data Streams applications. A typical Kinesis Data Streams application reads data from a data stream as data records. These applications can use the Kinesis Client Library, and they can run on Amazon EC2 instances. You can send the processed records to dashboards, use them to generate alerts, dynamically change pricing and advertising strategies, or send data to a variety of other AWS services

29. Distinguish Between Scalability and Flexibility?

The aptitude of any scheme to enhance the tasks on hand on its present hardware resources to grip inconsistency in command is known as scalability. The capability of a scheme to augment the tasks on hand on its present and supplementary hardware property is recognized as flexibility, hence enabling the industry to convene command devoid of putting in the infrastructure at all.  AWS has several configuration management solutions for AWS scalability, flexibility, availability and management.

30. What are the Different Types of Events Triggered By Amazon Cloud Front?

Different types of events triggered by Amazon CloudFront are as follows:

Viewer Request: When an end user or a client program makes an HTTP/HTTPS request to CloudFront, this event is triggered at the Edge Location closer to the end user.

Viewer Response: When a CloudFront server is ready to respond to a request, this event is triggered.

Origin Request: When CloudFront server does not have the requested object in its cache, the request is forwarded to the Origin server. At this time this event is triggered.

Origin Response: When CloudFront server at an Edge location receives the response from the Origin server, this event is triggered.

31. Explain Storage for Amazon Ec2 Instance.?

Amazon EC2 provides many data storage options for your instances. Each option has a unique combination of performance and durability. These storages can be used independently or in combination to suit your requirements.

There are mainly four types of storages provided by AWS:

  • Amazon EBS: Its durable, block-level storage volumes can be attached in running Amazon EC2 instance. The Amazon EBS volume persists independently from the running life of an Amazon EC2 instance. After an EBS volume is attached to an instance, you can use it like any other physical hard drive. Amazon EBS encryption feature supports encryption feature.
  • Amazon EC2 Instance Store: Storage disk that is attached to the host computer is referred to as instance store. The instance storage provides temporary block-level storage for Amazon EC2 instances. The data on an instance store volume persists only during the life of the associated Amazon EC2 instance; if you stop or terminate an instance, any data on instance store volumes is lost.
  • Amazon S3: Amazon S3 provides access to reliable and inexpensive data storage infrastructure. It is designed to make web-scale computing easier by enabling you to store and retrieve any amount of data, at any time, from within Amazon EC2 or anywhere on the web.
  • Adding Storage: Every time you launch an instance from an AMI, a root storage device is created for that instance. The root storage device contains all the information necessary to boot the instance. You can specify storage volumes in addition to the root device volume when you create an AMI or launch an instance using block device mapping.

32. What are the Security Best Practices for Amazon Ec2?

  • There are several best practices for secure Amazon EC2. Following are a few of them.
  • Use AWS Identity and Access Management (AM) to control access to your AWS resources.
  • Restrict access by only allowing trusted hosts or networks to access ports on your instance.
  • Review the rules in your security groups regularly, and ensure that you apply the principle of least
  • Privilege — only open up permissions that you require.
  • Disable password-based logins for instances launched from your AMI. Passwords can be found or cracked, and are a security risk.

33. Explain Stopping, Starting, and Terminating an Amazon Ec2 Instance?

Stopping and Starting an instance: When an instance is stopped, the instance performs a normal shutdown and then transitions to a stopped state. All of its Amazon EBS volumes remain attached, and you can start the instance again at a later time. You are not charged for additional instance hours while the instance is in a stopped state.

Terminating an instance: When an instance is terminated, the instance performs a normal shutdown, then the attached Amazon EBS volumes are deleted unless the volume’s deleteOnTermination attribute is set to false. The instance itself is also deleted, and you can’t start the instance again at a later time.

34. What is S3? What is it used for? Should Encryption be Used?

S3 implies for Simple Storage Service. You can believe it similar ftp warehouse, wherever you can transfer records to and from beyond, merely not uprise it similar to a filesystem. AWS automatically places your snaps there, at the same time AMIs there. sensitive data is treated with Encryption, as S3 is an exclusive technology promoted by Amazon themselves, and as still unproven vis-a-vis a protection viewpoint.

35. What is AWS Cloud Search

Amazon CloudSearch is a managed service in the AWS Cloud that makes it simple and cost-effective to set up, manage, and scale a search solution for your website or application.

Amazon CloudSearch supports 34 languages and popular search features such as highlighting, autocomplete, and geospatial search

36. What is Qlik Sense Charts?

Qlik Sense Charts is another software as a service (SaaS) offering from Qlik which allows Qlik Sense visualizations to be easily shared on websites and social media. Charts have limited interaction and allow users to explore and discover.

37. Define Auto Scaling?

Answer: Auto-scaling is one of the conspicuous characteristics feature of AWS anywhere it authorizes you to systematize and robotically obligation and twist up new models externally that necessary for your entanglement. This can be accomplished by initiating brims and metrics to view. If these proposals are demolished, the latest model of your preference will be configured, wrapped up and cloned into the weight administrator panel.

38. Which Automation Gears can Help with Spinup Services?

For the written scripts we can use spinup services with the help of API tools. These scripts could be coded in bash, Perl, or any another language of your choice. There is one more alternative that is patterned control and stipulating devices before-mentioned as a dummy or advanced descendant. A machine termed as Scalar can likewise be utilized and ultimately we can proceed with a constrained expression like a RightScale.

39. Explain what EC2 Instance Metadata is. How does an EC2 instance get its IAM access key and Secret key?

EC2 instance metadata is a service accessible from within EC2 instances, which allows querying or managing data about a given running instance.

It is possible to retrieve an instance’s IAM access key by accessing the iam/security-credentials/role-name metadata category. This returns a temporary set of credentials that the EC2 instance automatically uses for communicating with AWS services.

40. What is AWS snowball?

Snowball is a petabyte-scale data transport solution that uses devices designed to be secure to transfer large amounts of data into and out of the AWS Cloud. Using Snowball addresses common challenges with large-scale data transfers including high network costs, long transfer times, and security concerns. Customers today use Snowball to migrate analytics data, genomics data, video libraries, image repositories, backups, and to archive part of data center shutdowns, tape replacement or application migration projects. Transferring data with Snowball is simple, fast, more secure, and can be as little as one-fifth the cost of transferring data via high-speed Internet.

41. Explain in Detail the Function of Amazon Machine Image (AMI)?

An Amazon Machine Image AMI is a pattern that comprises a software conformation (for instance, an operating system, a request server, and applications). From an AMI, we present an example, which is a duplicate of the AMI successively as a virtual server in the cloud. We can even offer plentiful examples of an AMI.

42. If I’m expending Amazon Cloud Front, can I custom Direct Connect to handover objects from my own data center?

Certainly. Amazon Cloud Front stipulations culture rises computing sources of separate AWS. By AWS Direct Connect, you will be accelerating with the appropriate information substitution rates. AWS Training Free Demo

43. If My AWS Direct Connect flops, will I lose my Connection?

If a gridlock AWS Direct connects has been transposed, in the event of a let-down, it will convert over to the next one. It is voluntary to allow Bidirectional Forwarding Detection (BFD) while systematizing your rules to safeguard quicker identification and failover. Proceeding the opposite hand, if you have built a backup IPsec VPN connecting as an option, all VPC transactions will failover to the backup VPN association routinely.

44. What is AWS Certificate Manager?

AWS Certificate Manager (ACM) manages the complexity of extending, provisioning, and regulating certificates granted over ACM (ACM Certificates) to your AWS-based websites and forms. You work ACM to petition and maintain the certificate and later practice other AWS services to provision the ACM Certificate for your website or purpose. As designated in the subsequent instance, ACM Certificates are currently ready for performance with only Elastic Load Balancing and Amazon CloudFront. You cannot handle ACM Certificates outside of AWS.

45. Explain What is Redshift?

The executes it easy and cost-effective to efficiently investigate all your data employing your current marketing intelligence devices which is a completely controlled, high-speed, it is petabyte-scale data repository service known as Redshift.

46. Mention What are the Differences Between Amazon S3 and EC2?

S3: Amazon S3 is simply a storage aid, typically applied to save huge binary records. Amazon too has additional warehouse and database settings, same as RDS to relational databases and DynamoDB concerning NoSQL.

EC2: An EC2 instance is similar to a foreign computer working Linux or Windows and on which you can install whatever software you need, including a Network server operating PHP code and a database server.

47. Explain What is C4 Instances?

C4 instances are absolute for compute-bound purposes that serve from powerful-performance processors. AWS Interview Questions and Answers

48. Explain What is DynamoDB in AWS?

Amazon DynamoDB is a completely controlled NoSQL database aid that renders quick and anticipated execution with seamless scalability. You can perform Amazon DynamoDB to formulate a database table that can save and reclaim any quantity of data, and help any level of application transactions. Amazon DynamoDB automatically increases the data and transactions for the table above an adequate number of servers to supervise the inquiry function designated by the customer and the volume of data saved, while keeping constant and quick execution.

49. Explain What is ElastiCache?

A web service that executes it comfortable to set up, maintain, and scale classified in-memory cache settings in the cloud is known as ElastiCache.

50. What is the AWS Key Management Service?

A managed service that makes it easy for you to create and control the encryption keys used to encrypt your data is known as the AWS Key Management Service (AWS KMS).


The above questions will provide you with a fair idea of how to get ready for an AWS interview. You are required to have all the concepts relating to AWS in your fingertips to crack the interview with ease. These questions and Answers will boost your confidence level in attending the interviews.

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