50+ AWS Interview Questions and Answers for Getting a Job

Cracking the AWS Interview is not a cakewalk as there are more than 20000 positions open worldwide wide and there are lakhs of candidates who apply for each role.

Hence the competition is very tough and consists of multiple tests and interview rounds to screen and hire the best candidates.

Once you have applied for a role in AWS, you should start preparing for the further rounds and interviews to get selected.

The best way to prepare for an interview is by going through the questions asked in the previous hiring interviews.

Also, you should know about the role you are applying for and the vision of the company.

Here in this article, you will get a list of more than 50 interview questions with answers that have been frequently or recently asked in AWS interviews.

AWS Interview Questions and Answers

1. What is AWS?

Answer: AWS is the abbreviation for Amazon Web Service. It is a cloud computing platform that delivers remote computing services such as storage, server, content delivery, and many more associated services to the user.

2. What is meant by S3?

Answer: S3 means simple storage service. The s3 interface is used to store and retrieve any data from anywhere at any time. The payment model for S3 is ” pay as you go.”

3. Please tell me how can you send a request to Amazon S3?

Answer: The Amazon S3 is a REST service. A request can thus be sent using the REST API or the AWS SDK wrapper libraries defining the Amazon S3 REST API.

4. Which are the AWS products built for cloud services?

Answer: Computing, Storage, and Networking are the three kinds of cloud services for which AWS products are built.

Auto Scaling, EC2, Lambda, Lightstat, Elastic Beanstalk are the AWS products built for computing.

S3, Glacier, Elastic File System, Elastic Block System, are the AWS products built for storage.

VPC, Amazon CloudFront, Route53 are the products for networking.

5. What is Auto Scaling?

Answer: Auto Scaling is the function that supports the launch of new instances based on the demands.

Thus the resource capacity can be changed by the user as per the demand level.

6. By default, how many buckets can be created in AWS?

Answer: You can create 100 buckets for each AWS account by default. Buckets are nothing but directories and they should have a unique name globally.

7. What do you understand by AMI?

Answer: AMI stands for Amazon Machine Image. AMI are images that are used to create EC2 instances.  It is a template providing the infirmary required to launch an instance. The instance is a copy of the AMI running as a virtual server in the cloud.

8. What is the relationship between an AMI and an instance?

Answer: Using a single AMI, multiple types of instances can be launched. The type of instance tells about the hardware of the host computer that is used for your instance. Each instance has different memory and computer capabilities. After an instance is launched, it works as the traditional host and can interact just like any other computer.

9. What are the different types of authentication available in AWS?

Answer:

1. Session Token
2. User Name/Password
 3. Access Key

10. What are the main differences between EC2 and S3?

Answer: EC2 is a cloud web service but S3 is a data storage system.

EC2 is a big computer machine compatible with OS like Windows and Linux and applications like Python, Apache, PHP, or any database application whereas S3 has the REST interface and it uses the HMAC-SHA1 key as authentication.

EC2 is used for hosting web applications and S3 is used for storing any amount of data.

11. What is a T2 instance?

Answer: T2 instance is intended to offer moderate to higher-level performance depending on the workload and requirements.

12. How many Elastic IPs can be created by AWS?

Answer: 5 VCP Elastic IPs can be created by each AWS account.

13. What are key pairs in AWS?

Answer: Key-pairs is the secure login information for the virtual machines. It consists of a public-key and a private key that can be used to connect to the instances.

14. What is the default storage class in S3?

Answer: Well, the default storage class in S3 is referred to as the Standard frequently accessed.

15. What are the roles in AWS?

Answer: Roles in AWS provide permission to the trusted entities within the AWS account. They are similar to users and they need not create any username and password to work with various other resources in AWS.

16. What is VPC?

Answer: VPC stands for Virtual Private Cloud. It helps in the customization of the network configuration process. It allows user to have their IP address range, subnet, internet gateway, and security groups. Thus the network is logically separated from other cloud networks.

17. What is a subnet?

Answer: The large section of IP addresses when divided into smaller parts is called a subnet. There can be a maximum of 200 subnets per VPC.

18. Which command is used to create a new security group with an AWS account?

Answer: The command used is – ec2-create-group CreateSecurityGroup

The AWS security group works like a Firewall that controls in and out of our instance. In AWS terms, we call it Inbound and Outbound traffic.

19. Which is the storage solution offered by AWS with low pricing and Data Archiving?

Answer: Amazon glacier is a cost-effective storage service for data archiving and backup.

20. Define Amazon ElasticCache?

Answer: Amazon ElasticCache is a web service that allows the easy deployment, scaling, and storage of data in the cloud.

21. What is AWS Lambda?

Answer: AWS Lambda is a computing service of Amazon that allows running the code in the AWS cloud without server management.

22. What is Redshift?

Answer: Redshift in AWS is a fast and powerful big data warehouse product that can easily manage data warehouse service in the cloud.

23. Define SQL in AWS?

Answer: Th full form of SQL is Simple Queues Services that offers a distributed queuing service that acts as the mediator for two controllers.

24. Can Elastic IPs be created in AWS?

Answer: Yes Elastic IPs can be created in AWS.

25. Mention the advantages of auto-scaling?

Answer: The advantages of auto-scaling are-

  • Better cost management
  • Better availability
  • It Offers fault tolerance

26. Define Snowball.

Answer: Snowball is a data transport option. With snowball, you can transfer a huge amount of data from one place to another. It helps is the networking cost reduction.

27. Does Amazon VPC support broadcast or multicast?

Answer: No, Amazon VPC does not support broadcast or multicast.

28. What are the different types of instances?

Answer: The different types of instances are-

  • Computer Optimized
  • Memory-Optimized
  • General Purpose
  • Accelerated Computing
  • Storage Optimized

29. How is a buffer used in AWS?

Answer: The use of buffer makes the system more robust for traffic management or load by synchronization of different components. The components generally process the received requests in an unbalanced way. Buffer helps in balancing the components and provides faster services.

30. Database servers are ideally launched into which subnet? private or public?

Answer: Database servers are ideally launched into private subnets in the case of both private and public subnets in VPC.

31. What is the difference between region and availability zone?

Answer: Regions are the different geographical locations and the availability zone is the

part of the regions that are isolated zones that can replicate themselves when the need arises.

32. What are the possible connection issues that you can face while connecting to your instance?

Answer: The connection errors that one can face while connecting instances are-

  • Unsupported authentication.
  • Error using Mac OS RDP Client.
  • Host key not found.
  • Unprotected private key file.
  • Unrecognized user key.
  • Connection timed out.

33. What is CloudFront geo-targeting?

Answer: Geo-Targeting in CloudFront supports customized content creation for a targeted audience depending on the demands of a specific geographical area.

This enables personalized business showcase to the targeted audience without URL change.

34. What are the steps involved in CloudFront?

Answer: The four steps involved in CloudFront are:

  1. Creation of a CloudFormation template in YAML or JSON format.
  2. Save the code in the S3 bucket to serve as the repository for the code.
  3. Creating a new stack on the template using the AWS CloudFormation.
  4. CloudFormation reads the file and understands the services required that are called with the order details, relationships with services, and required provisions.

35. Which tools in AWS helps you recognize that you are paying more than required for it?

Answer: AWS budgets, Cost allocation tags, Checking the top service table, and Cost explorer are the four tools that help in recognizing that you are paying more than required.

36. Can a Peering connection be established to a VPC in a different region?

Answer: No, a Peering connection can be established only between VPCs in the same region.

37. When was EC2 launched?

Answer: EC2 was launched officially in the year 2006.

38. What are the types of AMI provided by AWS?

Answer: EBS backed an instance store backed are the two types of AMI provided by AWS.

39. Define SimpleDB.

Answer: SimpleDB is a data repository of structure rec8rd that encourages data indexing and data doubts. EC2 and S3, both are called SimpleDB.

40. Which AWS service exists only to redundantly cache data and images?

Answer: AWS Edge locations are services to redundantly cache data and images.

41. What are the ways to enhance security in Amazon EC2?

Answer:

  1. Frequently reviewing security group rules.
  2. Disable password-based logins for instances launched from AMI.
  3. By allowing only trusted Host or networks to access ports on the instance.
  4. By controlling access to the AWS resources using IAM.

42. How can you use Amazon S3 with an EC2 instance?

Answer: Amazon S3 with EC2 instances can be used for instance with root devices backed by local instance storage.

Amazon provides an array of tools to load the AMIs into Amazon S3.

AWS developers can access reliable, inexpensive, fast, and scalable data storage infrastructure using Amazon S3.

43. How can we speed up the data transfer in Amazon snowball?

Answer: Data transfer can be made faster in Amazon snowball by-

1.  Reducing the encryption overhead by creating small batches of files for transferring large files
2.  By performing multiple copy operations simultaneously.
3.  By eliminating needless hops.
4.  Copying from different workstations to the same snowball.

44. How are scalability and elasticity different?

Answer: Scalability increases the hardware resources for handling the increase in demand.

Elasticity is the ability of a system to add hardware resources when the demand increases and to roll back the skilled resources when the demand decreases.

45. Differentiate between Amazon RDS and Amazon DynamoDB.

Answer:  Amazon RDS a database management service for relational databases whereas Amazon DynamoDB is a no SQL database service.

Amazon RDS deals with structured data whereas Amazon DynamoDB deals with unstructured data.

46. What is the boot time taken for the instance Store-backend AMI?

Answer: The boot time taken is less than 5 minutes for an Amazon instance store-backend AMI.

47. How do you connect EBS volume to multiple instances?

Answer: We cannot connect EBS volume to multiple instances but we can connect various EBS volumes to a single instance.

48. Are you allowed to do vertical scaling allowed in the Amazon instance?

Answer:  Yes we can vertically estimate one Amazon instance.

49. What are the various storage classes available in Amazon S3?

Answer:  The storage classes available with Amazon S3 are-

  • Amazon S3 reduced redundancy storage.
  • Amazon S3 standard.
  • Amazon S3 standard-infrequent access.
  • Amazon Glacier.

50. Mention some of the DB-engines that can be used in AWS RDS.

Answer: Below are some of the DB-engines that can be used for AWS RDS:

1. MS-SQL DB
2. PostgreDB
3. Oracle DB
4. MYSQL DB

51. What are the different types of Cloud Services?

Answer: Cloud services can be classified as:

1. SaaS (Software-as-a-service)
2. IaaS (Infrastructure-as-a-service)
3. PaaS (Platform-as-a-service)


Conclusion

This article consists of the most important and frequently asked questions in the AWS interview and will definitely help you in preparing better and you can ace the interview.

Best of luck for the AWS interview.


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