30+ AWS Interview Questions 2021 [Updated]

AWS Interview Questions: AWS (Amazon Web Services) is Amazon’s comprehensive & rapidly developing cloud computing podium. It offers platform-as-a-service, infrastructure-as-a-service, & software-as-a-service solutions. This offer provides a different set of worldwide computing, investigation, database, application, & sending services to assist businesses to grow faster.

One can use AWS for creating Virtual Machines that can be equipped with some processing power, analytics, and storage capacity with networking device management. If you’re attracted to some career in the cloud industry, the chance is here. Using platforms for cloud computing like AWS taking present business circumstances through a storm, getting skilled & certified in a certain forum offers you great career prospects.

AWS interview questions and answers for 5 years experience

Q1. What is AWS?

Ans: AWS (Amazon Web Service) it’s a group of remote services of computing also understood as a platform for cloud computing.

The new area of cloud computing is also understood as Infrastructure-as-a-Service.

Q2. What’s EC2?

Ans: EC2 refers to a Virtual Machine in the cloud which one has OS-level control. One can operate the cloud server when you need & can be utilized when you require deploying your servers in the cloud, which is similar to one’s on-premises servers when one has complete control over the selection of hardware & the updates on a machine.

Q3. What’s Cloud Computing?

Ans: This is like a third-party server where one can keep big information data with no hardware or software required. If you’ve internet, you need to operate from any place same like Gmail.

Q4. What are the major parts of AWS?


  • Simple Email Service
  • This enables sending email utilizing regular SMTP or RESTFUL-API call
  • Route 53
  • This is a DNS-web service
  • Identity & Access Management
  • It offers improved security & distinctiveness management for one’s AWS account.
  • Elastic Compute-Cloud
  • It offers on-demand computing properties for hosting apps. It’s handy just in case of irregular workloads.

CloudWatch: Monitors AWS resources, which enables administrators to view & collect the key. One needs to set an alarm notification in case of danger.

Simple Storage-Device or (S3): It’s a storage device & the more broadly utilized AWS service

Elastic Block-Store: It provides persistent volumes storage attached to EC2 to enable one to persist information past the lifespan of an Amazon EC2.

Q5. What’s auto-scaling?

Ans: This is an operation that enables one to provision & inauguration new instances when there’s demand. This enables one to auto decrease or increases resource capacity concerning demand.

Q6. What’s geo-targeting at CloudFront?

Ans: This is an idea where businesses show customized content for an audience based on their geographic location minus changing URL. This assists one in creating a modified content for an audience of a particular geographical area. This keeps their needs at the forefront.

Q7. What is the importance of buffer in Amazon Web Services?

Ans: An Elastic-Load Balancer guarantees that incoming traffic is dispersed optimally via numerous AWS instances. Buffer synchronizes various parts & makes arrangements extra elastic to some burst of load-or-traffic. Components are susceptible to operate in an unsteady way of processing & receiving requests. Buffer makes an equilibrium joining various apparatus & crafts them to operate simultaneously to supply extra rapid services.

Q8. Why are subnets made?

Ans: Making subnets means distributing a large network to smaller ones. The subnets are made for numerous reasons. For instance, creating & utilizing subnets which assist in reducing congestion by being certain that traffic intended for the subnet remains in a subnet. This assists in proficiently routing traffic coming to the network, which decreases the network’s load.

Q9. What’s Amazon S3?

Ans: Amazon S3 stands for Simple-Storage-Service. This refers to object storage which has a simple website service interface that stores & retrieves every amount of information anyplace on the web.

Q10. What’s CloudFront?

Ans: Amazon CloudFront has become among the most known distribution in the world. This is because of its ability to accelerate the transmission of dynamic and static web content, including .html, .js &.css files. CloudFront operates efficiently using services like AWS-Shield & assists in helping in curbing DDoS attacks. It utilizes Amazon S3, Elastic Load Balancing, or Amazon EC2 as sources for one’s applications & utilizes Lambda-@-Edge for running custom-code closer to & personalizes client users.

Q11. What’s AWS SNS?

Ans: Amazon Simple-Notification-Service refers to a push-notification service utilized in sending personal messages to some big set of email/mobile subscriber systems like Amazon SQS-queues, HTTPS endpoints & AWS-Lambda functions. This is both application-to-application & application-to-person communication.

Q12. What’s Sharding?

Ans: Horizontal partitioning (Sharding) refers to scale-out methods for some relational databases. The technique is utilized for placing information to smaller subsets & distribute it across physically divided database servers. This is where all servers are known a database shards. The database shards contain the same hardware, data structure & database engine; thus same performance level is generated.

Q13. List some of the qualities of Cloud Computing?


  • Multi-tenant
  • No big setup fee
  • Subscription
  • Fixed, probable cost
  • Auto Upgrade
  • Scales with one’s business

Q14. What’s CloudWatch?

Ans: This helps one in monitoring AWS environments, including EC2, CPU utilization & RDS Instances. It also activates alarms relying on different metrics.

Q15. What’s AMI?

Ans: AMI is a short form for Amazon-Machine-Image. This is a template that offers the inflation needed in launching an install launch an instance, ting as a virtual-server in the cloud.  One can intrthe oduce instances from various AMIs as required.

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Q16. What’s Elastic Transcoder?

Ans: This is an AWS-Service Tool that assists one in varying a video’s format & resolution, which supports various devices including tablets, laptops, & smartphones of various resolutions.

Q17. State other alternative tools to log inside cloud environment other than support?

Ans: The tools which will assist you to log in to AWS resources include:

  • AWS CLI for Linux
  • Putty
  • AWS CLI (Windows)
  • AWS CLI (Windows CMD)
  • Eclipse

Q18. Which of the services can be utilized in creating a central logging solution?

Ans: Essential services which one could use include Amazon CloudWatch-Logs, keep them at Amazon S3, & utilize Amazon Elastic-Search for visualizing them. One can utilize Amazon Kinesis Firehose, which moves the information from Amazon-S3 to the Amazon-ElasticSearch.

Q19. When should one utilize the classic load balancer & the app load balancer?

Ans: While app load-balancing is utilized for extra intelligent load-balancing, dependent on container-based architecture or multi-tier architecture of an application. App load balancing is majorly utilized when there’s a necessity to channel traffic to more services.

Classic load-balancer is utilized for easy load balancing to traffic across more EC2 instances.

Q20. What’s DynamoDB?

Ans: DynamoDB refers to a NoSQL database. It’s very flexible & performs very reliably. It can be joined with AWS, which offers fast & predictable presentation which has seamless scalability. With the assistance of DynamoDB, one doesn’t require to worry about hardware provisioning, configuration, setup, replication, cluster scaling & software patching.

Q21. What’s Elastic Beanstalk?

Ans: Elastic Beanstalk is an orchestration service by AWS, is used in numerous AWS applications like EC2, Simple Notification-Service, S3, CloudWatch, Elastic Load-Balancers & autoscaling. It’s the fastest & simplest method of deploying one’s app on AWS utilizing AWS-Management Console, an integrated development environment, & a Git repository.

Q22. What’s a T2 instance?

Ans: These are made to offer moderate baseline performance & the ability to burst to bigger performance as needed by workload.

Q23. What’s Geo Restriction at CloudFront?

Ans: Geo restriction is also understood as geoblocking. It’s used for preventing clients in some precise geographic places from accessing content which you are distributing via CloudFront web dispersal.

Q24. What’s a Serverless app in relation to AWS?

Ans: AWS Serverless App Model prolongs AWS CloudFormation, which offers some simplified methods of defining Amazon API-Gateway APIs, Amazon DynamoDB-tables & AWS Lambda functions required by your serverless app.

Q25. What’s multi-AZ RDS?

Ans: Multi-AZ RDS allows one to have some copy of one’s generation database to a different accessibility zone. Moreover, the Multi-AZ database is used for disaster recuperation. You’ll have an accurate database. Thus when one’s necessary database moves down, one’s application consequently fails over to the backup database.

Q26. What’s meant by classic-link?

Ans: Amazon virtual reserved cloud classic link allows EC2 examples in EC2 unlimited stage. This occurs; thus, it could speak with occasions that are accessible in the virtual-private cloud. Correspondence occurs with the assistance of reserved IP addresses. Using a great connection, it’s important that you empower it to a virtual private cloud in one’s record. One needs to relate a security group with a case in EC2 great. Security bunch is offered by VPC which you vested the best connection in one’s record. All single principle that’s there for VPC security-bunch remains relevant for correspondences between examples at EC2 exemplary & those circumstances in VPC.

Q27. Explain the relationship between Availability Zone & Region?

Ans: Availability Zone refers to a physical place where Amazon data-center is found. AWS Region refers to a group or collection of Data Centers or Availability Zones.

The setup assists your services to be more accessible as you will be able to place the VMs in various data centers in AWS Region. If data centers are unsuccessful in the Region, client requests still become served from different data centers found in a similar Region. The arrangement will assist your service to be accessible even if Data Center is down.

Q28. What are consistency models to modern DBs provided by AWS?


Strong Consistency – It offers an instant consistency where information will be constant across all DB Servers directly. The model can take longer to make information consistent & subsequently begin serving requests again. Moreover, with this model, it’s guaranteed that every response will have steady data.

Eventual Consistency – This means that information will be steady eventually, though it may not be instant. This serves client requests quicker, though chances are some early read requests might read the stale information. This kind of consistency is desired in systems where information doesn’t require being real-time. For instance, if one doesn’t see recent Twitter tweets or latest posts on Facebook for some seconds, it’s acceptable.

Q29. Describe Connection Draining

Ans: These are features offered by AWS, which allows one’s servers that are going to be removed or updated to serve current requests.

When Connection Draining is allowed, Load Balancer enables an outgoing example to complete current demands for some particular period, though it won’t send a new request on it. When there’s no Connection-Draining, outgoing illustrations instantly move off & requirements are awaiting at instance error-out.

Q30. What’s Power-User Access concerning AWS?

Ans: Admin User is similar to the owner of AWS Resources. He creates, deletes, views, or modifies resources & grants permissions to different users for AWS Resources.

Power User Access offers Administrator Access minus capability for managing users & permissions. Also, user’s with Power-User Access deletes, creates, sees resources, or modifies but cannot offer permissions to different users.


At your AWS interview, you will likely come across these questions. Thus, studying them well will give you the upper hand in answering the question correctly.

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