Top 50 AWS Interview Questions and Answers

By | October 8, 2021

Amazon Web Service or AWS, launched by Amazon, is one of the leading on-demand cloud platforms in the industry. The first launch was made in 2002 when AWS used to provide web services. Cloud Storage was launched in 2006. The reason behind AWS getting an upper hand on its counterparts is that AWS provides the various basic technical infrastructure and distributed computing building blocks and tools.

AWS provides a console for managing accounts and monitoring the costs in its web-based interface. The console works on an account and a mobile application. It allows applications to be developed as AWS in the back-end due to its wide availability in most of the Software development Kits.

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AWS consists of three cloud computing models described below:

  1. Infrastructure as a Service: Iaas is the basic layer of infrastructure for instant computing in cloud IT. It facilitates services such as storage resources, and access to networking tools over the internet.
  2. Platform as a Service: PaaS is a model for cloud computing that provides an environment for the deployment of applications in the cloud. It provides services and stacks for the deployment of applications. The platform it provides gives services such as databases, and OS and handles the scalability of the applications.
  3. Software as a Service: The SaaS is a browser-based user application. Saas is totally handled by the provider of the service. Applications that use Saas are, Saleforce.com, Web-based email, Office 365, etc.

AWS gained significant growth in a couple of years, leaving its competitors far behind it. It dominates the cloud industry by occupying 33% of it, while Microsoft rests at 18% and Google at 9%. AWS developers in the industry are significantly well paid as it is broadening its boundaries towards all sectors. It fulfills the need of users for any number of servers at any time in minutes, thus making it convenient as users earlier had to book the servers in advance weeks and months before

Top AWS Interview Questions and Answers

1. What do you understand by AWS?

Answer: AWS or Amazon Web Services. AWS is a cloud storage platform that provides various computing services such as networking services, cloud services, and storage services. It provides cheap and efficient cloud computing solutions, which are more scalable than other cloud services.

AWS has stepped in and provided its services in a number of technical as well as non-technical fields. AWS provides solutions in the fields of gaming technology, advertising and marketing, financial services, healthcare, and life sciences, manufacturing, and a lot more.

AWS provides the three cloud computing models described as below:

  1. Infrastructure as a Service (IaaS): Iaas is the basic layer of infrastructure for instant computing in cloud IT.
  2. Platform as a Service (PaaS): PaaS is a model for cloud computing that provides an environment for the deployment of applications in the cloud.
  3. Software as a Service(SaaS): SaaS is a browser-based user application.

2. What services are provided by AWS?

Answer: Following are the types of services provided by AWS:

Computing

  • AWS Lambda: AWS Lambda is highly efficient in computing. It allows its users a cheap and efficient service, as the users only pay for the time taken by the program to compute. You don’t have to pay when your program is not running.
  • Amazon EC2: Amazon EC2 is an abbreviation for Amazon Elastic Compute Cloud. It provides a secure environment for its users and lets you choose resizeable cloud computing capacity.
  • AWS Elastic Beanstalk: It is a platform that provides easy and efficient deployment of applications.

Networking

  • Amazon VPC: Amazon VPC is known for letting the users create a private network with complete access and command over it
  • Amazon Route 53: Amazon Route 53 provides a reliable and pocket-friendly way of routing to its users.

Storage

  • Amazon S3: Amazon S3 is a platform that provides storage to store any amount of data with high durability and equally easy retrieval.
  • Amazon Glacier: It is another storage service whose specialty is its cheapness and long-term storage service.

3. What is auto-scaling?

Answer: Auto-scaling in cloud computing refers to adjusting the resource capacity according to the demand. It dynamically increases or decreases the number of servers that are active as per the load and preferences.

AWS also provides the auto-scaling of applications and automates the scaling of different resources by optimizing the cost and availability. AWS auto-scaling is quite efficient and powerful for users allowing them to create scale plans. Auto-scaling automatically scales up or scales- down instances in the resource. Auto-scaling in AWS lets the users maintain the optimality of the application’s performance even in the case of non-uniform loads and demands, by monitoring the performance continuously. Desired performance levels are ensured for the applications to run on by the auto-scaling in AWS.

AWS auto-scaling console also lets the users track and configure what’s happening and enhances the quality and performance levels throughout. The scaling here involves both predictive and dynamic scaling to adjust the computing power. Users can either choose the strategies for scaling or they can create their own customized strategies for scaling to optimize utilization of resources.

4. Explain geo-targeting in CloudFront?

Answer: The Amazon CloudFront provides geo-targeting that can locate the user’s origin from where the content is getting accessed, thereby allowing them to create content personalized according to that target location and their audiences. The geographic location information is received by the servers of Amazon CloudFront in an HTTP header. This allows a customized content delivery as per the demands of the users of specific locations around the world, without changing the URL.

User’s country is detected by geo-targeting and then the code of their country is sent to the servers located in your region, and that’s how you can target the viewer of specific geographic locations. This feature is available in the Amazon CloudFront without any extra charges, and you can choose which headers you want to forward to the servers of your origin.

5. Differentiate between EC2 and S3?

Answer:

EC2 S3
It’s a cloud-based web service It’s a data storage service.
It is used to host your applications over the cloud. It is used to store and manage the data for the applications.
EC2 is a machine that is based on the cloud. It is not a machine, instead, it’s a REST interface.
EC2 can be set up as per the requirement, as it is capable of running many utilities like Apache, PHP, LINUX, WINDOWS, and even databases. S3 allows you to store large binary data and other large data objects and it can even work along with EC2.

6. Explain AWS Lambda?

Answer: AWS Lambda, launched in 2014 is a highly efficient computing platform. It is serverless so that the users don’t have to manage the servers while executing their programs. AWS Lambda supports a vast variety of languages including Python, C#, Node.js, Java, Go, and Ruby.

Lambda enables its users, virtual execution of any type of program or server-side services without any management or provisioning. It allows its users a cheap and efficient service, as the users only pay for the time taken by the program to compute. You don’t have to pay when your program is not running, unlike its counterpart Amazon EC2 which is metered per hour.

It also supports automatic scaling of the code, which means that while your program will get executed, Lambda will meter the number of requests up to thousands of requests per second without any delay.

7. Explain the Amazon EBS Volumes.

Answer: Elastic Block Stores or EBS is a storage service that is used to connect the instances like EC2. Amazon EBS Volume is a highly durable and flexible block-level storage device that once connects an instance, makes it work like a physical hard drive. The storage size can be increased dynamically according to the needs of the user.

EBS Volumes are highly efficient and useful for storing the type of data that needs frequent modification and updates such as a database. Multiple EBS Volumes can be connected to a single instance using Multi-Attach, depending on the type of instances.

Amazon EBS also provides a data encryption feature. All volumes can be encrypted and can be used by the users to meet the vast range of data encryption requirements.

8. What is the need for subnetting?

Answer: Subnetting means creating sub-parts of a single large network, to serve security purposes and increase efficiency. This makes it easier to maintain the smaller networks and it also provides security to all the sub-networks. If there is subnetting in a network, then this will avoid any unnecessary routing of the network traffic and the traffic would have to travel a much shorter distance.

Data packets received from one network to another, are first sorted and then routed directly to the desired destination network through subnet, hence this reduces the unnecessary time taken for routing data.

In a network, there could be a huge number of connected devices, thus making it time-consuming for the data to reach the desired device. So, in such cases subnetting of the network plays a very crucial role. With subnetting, IP addresses can be narrowed down to devices in a small range so that the data can route directly in a much lesser time.

9. What do you understand by EIP?

Answer: Elastic IP (EIP) is a very important aspect in dynamic cloud computing, that allows communication between your instances and the internet. This comes in handy due to the fact that EIP is static and does not change after the termination of an instance. Public IP gets released as soon as an instance is re-launched, whereas an EIP remains the same even after the termination or start of an instance.

EIP makes the infrastructure simpler and adjusts the instances and their communication with the public internet according to the changing environments. EIP is basically combined of both public and static IP addresses. AWS EIP is an excellent solution for dynamic cloud computing as its static, as well as public states, allow the advertisement of content in a dynamic environment.

10. Why should one use Amazon EBS volumes over its other competitors?

Answer: Amazon EBS Volumes provide a wide range of user-friendly features and benefits among whom, some are listed below:

  • Data availability: EBS volumes have their own availability zones depending on which they get attached to the instances. Multiple volumes can be connected to a single instance if they are available in the availability zone. Once attached, it can be used just like a physical hard drive.
  • Data Persistence: EBS offers non-volatile storage. Connected EBS volumes can be disconnected from a running instance, without the fear of losing data, Data will still be stored in the memory unless you delete it by will.
  • Data Encryption: EBS also supports data encryption. Every volume can be encrypted easily with the Amazon EBS encryption feature. It uses AES-256 or 256-bit Advanced Encryption Standard algorithms for encryption.
  • Snapshots: Amazon EBS Volume lets users create backups of the instances. Instances need not be connected to any volume for taking snapshots. Snapshots taken of an availability zone remain inside the same zone.

11. What is Cloudwatch?

Answer: AWS Cloudwatch is a tool to monitor the applications and manage the services of cloud resources. This allows you to have a metric report of the performance of your application in real-time and other services of AWS in the form of stats and graphical reports allowing you to configure all your AWS services within the console. Using Cloudwatch monitoring, instances can be upgraded or downgraded as per the load requirements.

AWS provides 2 types of Cloudwatch:

Basic monitoring: Basic monitoring is enabled by default by the AWS Cloudwatch on the launch of an instance. A period of 5 minutes is taken by the Cloudwatch to collect monitoring data.

Detailed monitoring: To get detailed monitoring of the instances, you have to enable it explicitly to have detailed data so that it will be enough to decide upon better architecture about the computing resources of your application. Detailed monitoring Cloudwatch takes up a period of 1 minute for getting detailed monitoring data.

12. What do you understand by Amazon EC2?

Answer: Amazon EC2 or Amazon Elastic Compute Cloud. It is a cloud computing platform that provides an environment that is secure for computing over the cloud. The cloud computing capacity provided by it is resizable and can be altered by the user according to their needs. The term elastic is derived from the flexibility it provides to create or terminate instances whenever you need it.

Amazon EC2 lets us choose the type of processor, storage, networking system, OS, and purchase model of our own choice. According to Amazon, Amazon EC2 provides the fastest processors among all the cloud computing platforms with a speed of 400 GBps ethernet.

Amazon EC2 ensures its users that they do not have to pay per hour or per day rather have to pay only for the time taken by the program to compute which is unique in its own way. Instances choices offered by Amazon EC2 are one of the widest among all which include A1, Cn5, T2, M4. macOS is supported only by this cloud.

13. What do you know about Amazon VPC?

Answer: VPC or Virtual Private Cloud. Suggested by the name, it enables you to create your own personal virtual cloud network. Amazon VPC provides you the privilege to choose your own IP address, lets you create your personal subnets, and configuration routing networks. Multiple users in a single cloud can create their private networks by allocating their private IP addresses.

VPC is free of cost, but if users use any Virtual Private Network or VPN, they have to pay for each of them. VPC can be created by the command-line interface provided by Amazon or AWS Management Console. It provides an easy and efficient setup so that the user can spend more time building projects rather than getting exhausted in setting up.

It also ensures a secure network. You can store your data on Amazon S3 and divert its access so that only those who are inside your VPC can access the data. It also allows inspection of your traffic to provide additional security.

14. What is Amazon S3?

Answer: Amazon Simple Storage Service (S3), a service for the storage of data is used to store and manage the data for applications overcloud. It is not a machine, instead, it’s a REST interface. S3 allows you to store large binary data and other large data objects and it can even work along with EC2. S3 is capable of storing and retrieving data of any amount, and provides security to that data along with backup and restore and many easy-to-use features, such as scaling up the data resources.

Simple Storage Service is used by applications in millions of numbers all around the globe. S3 is robust and capable to manage permissions, cost, privacy, and data access quite efficiently. S3 objects can also run the big data analytics with the services provided by AWS S3.

The Amazon S3 is a very durable service with a durability of approximately 99.99% which makes it highly reliable for the security of data and metadata stored in it. It also provides various certifications for multiple security compliance.

15. Can you cast S3 with EC2 Instances? If yes, explain how?

Answer: Yes, if root approaches having native storage backup are used, then S3 instances can be cast off with the EC2 instances. The S3 services by Amazon provide a developer with the capability to use storage structures that have highly scalable and reliable operations. But if you want to use these operations with EC2 instances, then some tools are provided which need to be used in order to achieve the task.

16. What do you know about Amazon DynamoDb?

Answer: Amazon DynamoDb is a cloud database based on NoSQL that can operate trillions of user requests per day. It is a high-performance and durable database that can give very high performance at any scale. Amazon DynamoDb has an in-built backup and security for the applications along with caching in-memory.

A big number of companies with the largest scale applications in the world are using DynamoDb for handling the workloads of their database due to its high reliability and scaling. DynamoDb is a self-handled service that just needs you to add your application and then leave everything on DynamoDb to handle. There is no need to manage servers or install any software, everything will be automatically handled by DynamoDb itself.

17. Differentiate between terminating and stopping an instance?

Answer:

  • Terminating an instance: Termination is in total contrast with stopping. Once you terminate your instance, all the instances connected to your EBS volumes instance get deleted, no matter if you have saved it or not. This process can not be undone and you can not access your instance again.
  • Stopping an instance: When you stop an instance, it simply means that you are applying a temporary shut down. EBS volumes still remain intact to the instances. Stopping does not result in any kind of data loss. That means that once you restart your instance, it can be resumed from the point where it was last left. And apart from that, you will not be charged additionally for the time being stopped.

18. How do on-demand instances differ from spot instances?

Answer:

  • Spot Instances: These instances are unreserved and extra instances, which are unused. They can only be purchased through bidding. Spot instances become available for usage only if the price exceeds the base price. There is no assurance from AWS on the availability of spot instances. They are cheaper and pocket-friendly as compared to on-demand instances.
  • On-demand instances: These instances are only available depending on the needs of the users and have a fixed price which one has to pay per hour. These demands can be deleted once there is no need for them. Unlike spot instances, you do not have to bid for them and are reserved and provided for sure by AWS.

19. Explain Amazon S3 Glacier?

Answer: Amazon S3 Glacier is a highly cheap and pocket-friendly cloud storage platform provided by AWS. Its specialty is high durability and long-term backup. It provides its user’s storage at a price as low as $1 per TB of data per month.

To meet the requirements of all kinds of users at a low cost, Amazon S3 Glacier avails three types of retrievals:

  • Expedited: These retrievals provide the fastest returns, just take 1-5 min.
  • Standard: These are best suited for less time requiring data like backup and media editing. They take 3-4 hours in returning the data.
  • Bulk: These retrievals are the cheapest among all. They work best for large chunks of data. Usually, they take 5-12 hours in returning the data.

20. What do you understand by Direct Connect?

Answer: Direct Connect by AWS service in cloud computing is used to provide a network connection dedicated for your internal network to AWS using an Ethernet cable. This service surely helps to reduce the costs for the network and you also experience a high bandwidth, without an internet connection. Virtual interfaces can also be partitioned using this dedicated network connection using VLANs. Public resources like S3 instances and private resources like EC2 objects can also be accessed using this connection. To access the private resources, you need to use private IP space. So, if the separation of the network is made for the private and public spaces, you can use the same connection to access both kinds of resources.

21. Differentiate Amazon RDS and Amazon DynamoDB?

Answer: Although both the services provide management of databases, however, there still exists a major difference between Amazon RDS and Amazon DynamoDB:

  • Amazon RDS is a service provided by AWS for managing relational databases. The operations for the relational databases are handled automatically by AWS RDS. However, it can only be used for data that is structured.
  • Amazon DynamoDb is a cloud database based on NoSQL that can operate trillions of user requests per day. It is a high-performance and durable database that can give very high performance at any scale. Amazon DynamoDb has an in-built backup and security for the applications along with caching in-memory.

22. Mention some of the ways that can be used to login to the cloud console.

Answer: Some of the popular tools or alternatives that can be used to login to the console are:

  • Eclipse: The Java IDE Eclipse has a plug-in that is actually a toolkit to access and use AWS keys. This plug-in is entirely open-source that helps the developers to access their AWS console right from the IDE itself.
  • AWS SDK: The AWS SDK API is also an amazing solution to get access to your cloud login and manage your console.
  • AWS CLI: This tool when downloaded can be used to access multiple services by AWS. Also, CLI stands for Command Line Interface.

23. How elasticity is different from scalability?

Answer:

Elasticity in cloud computing is simply upgrading and degrading the physical hardware resources as soon as the load varies. When there is an increase in the demand, the resources are increased, and when the workload decreases, the scaled resources are taken down.

Scalability in terms of cloud computing is somewhat similar to elasticity, but it differs by the fact that on the increase of the demand in workload, the load can be accommodated by an increase in the number of hardware resources or increasing the processing nodes.

Both elasticity and scalability are dependent upon the requirements and can rise or shrink accordingly, thereby providing a high performance for the applications.

24. Explain the steps to migrate a domain name that already exists to Amazon Route 53 without interrupting the web traffic.

Answer:

Follow the below-given steps to migrate an existing domain name to Amazon Route 53:

  • STEP 1: Get the DNS records of the domain name registered already from the extant DNS provider, usually available in a zone file format.
  • STEP 2: To store the DNS records, you need to create a hosted zone either by using the Route 53 console or the web-services interface.
  • STEP3: Now, send your information to the registrar to continue the migration process. When the registrar propagates the new name server, the DNS queries will be transferred.

25. What do you know about AWS cloud formation?

Answer: AWS cloud formation service helps developers manage all other AWS services in one place. This avoids the management hustle for the developer and the user can concentrate more on its application building than management.

Cloud Formation creates a template that contains all the details of the required resources of a particular project along with its properties. This template can be easily deleted as well. It also saves users from the replication process. Instead of replicating all the resources, you could simply create a template and then replicate it as a single unit.

26. Can standby DB instances be used with primary DB instances while executing DB instances as a Multi-AZ deployment? If YES/NO, then why?

Answer: The answer to this is NO. Since, as the name suggests, standby DB instances only work if primary instances crash, therefore they cannot work hand in hand.

27. What do you understand about SNS?

Answer: SNS or Simple Notification Service. This web service acts as a messenger i.e. sends all the messages and notifications directly to the user from the cloud.

SNS contains two kinds of clients:

  • Subscribers
  • Publishers

The Publisher is the server that sends the messages for the user. These messages could be anything. They could be a simple notification to a warning. While the subscriber is the developer using these services. These messages are received on one of the server-supported protocols such as HTTP, Lamba, etc.

28. Define SQS?

Answer: SQS is an abbreviation for Simple Queue Service. It establishes messaging communication between applications. It is a highly efficient and secure service, provided by Amazon in cloud computing. These applications do not need to be in an active state, SQS can deliver from an inactive state too. SQS can deliver messages across multiple AWS platforms such as Lambda, EC2, etc

SQS provides Standard queues and FIFO queues. Standard queue ensures that every application gets the message at least once. While on the other hand FIFO(First In First Out) makes sure that messages should be executed in the same sending order.

29. What is the work of redshift?

Answer: Amazon Redshift is a cloud management service. Its functions include monitoring the data to the provision of capacity to upload the data to the redshift engine.

Amazon redshift has a collection of nodes, among whom is a root node or leader node, and one or more computing nodes. The strength of the computing nodes depends on how large your data is, and how many queries you have for the execution.

It also enables the user to maintain backups. Backups can be created by the automated process or by manual process. If you wish to restore the data from an existing snapshot, you have to create a new cluster to which redshift will import the data.

30. Define IAM.

Answer: IAM stands for Identity Access Management. It provides security while accessing other AWS services. It enables you to create AWS groups and lets you decide whether AWS services

will be accessible by them.

IAM is free of cost. There are no extra charges for its services. You will only be paying for other AWS services you are using. It asks for the user credentials for access. Apart from that. To ensure the authenticity of the user, it asks for a security code, it generates when you try to log in. This code is also known as MFA code.

31. If one of the resources fails to be created by Amazon OpsWorks, then what will happen?

Answer: When one of the resources fails to be created successfully in the stack by Amazon OpsWorks, all the other successfully created resources get deleted automatically till the point of the error. This process is an Automatic Rollback on error.

The basic principle on which these feature works is that either the stack is completely created or does not get created at all. This also ensures that no error-containing resource is left behind in the stack.

32. Is there any default storage class with which S3 comes?

Answer: Yes, there is always a standard class in every storage service. Standard Class is the default storage class provided by S3.

33. How will you define KMS?

Answer: Amazon Key Management Service which is known as KMS is an efficient and secure security service, that protects your encrypted keys. It allows users to manage their keys for encrypted data, across a whole wide variety of services provided by AWS.

AWS gives total access to your keys to you by determining several admin-friendly usage permissions. Alongside this, it also makes sure the physical protection of these keys.

34. How will you state the difference between AWS CloudFormation and AWS OpsWorks?

Answer: Both, the AWS CloudFormation and AWS OpsWorks are management services provided by AWS. But still, they differ in some aspects.

AWS CloudFormation is a service that enables the developers to manage all other AWS services in one place. On the other hand, AWS OpsWorks widely focuses on providing a secure DevOps experience to its developers.

Compared to AWS CloudFormation, AWS OpsWorks serves fewer AWS resources which is a major drawback of it.

35. Does Standby RDS get launched in the same availability zone in which primary is launched?

Answer: No, Standby RDS does not get launched in the same availability zone in which primary is launched. Standby instances work as a backup for primary instances. When primary senses fail, they come into work. So they need to be stored in separate availability zones in order to remain independent from the primary instances.

36. Define AWS CloudTrail.

Answer: AWS CLoudTrail is a cloud governance service provided by Amazon. CloudTail enables you to govern your cloud services along with monitoring your activities. It also provides your event history, which is impacted by your daily AWS activities.

Benefits provided By AWS CloudTrail:

  • Simplified compliance
  • Visibility into resource and activity
  • Security analysis and troubleshooting
  • Security automation

37. Give a brief account of Amazon Elastic Beanstalk.

Answer: Amazon Elastic Beanstalk is a cloud computing service provided by Amazon for deploying your web applications. It supports a number of languages in which you can write your code, including Python, Node.js, Ruby, Go, Docker, etc.

You just have to upload your program on Elastic Beanstalk, and it will automatically manage and deploy your project on the servers. You never lose control over your application and can access all the resources used in your project anytime you want.

38. Which AWS storage service is best for data archiving and low cost?

Answer: Amazon S3 Glacier is extremely pocket-friendly and provides efficient services to its clients. It also provides data archiving which makes it highly popular in the industry.

39. Define Elastic LoadBalancing.

Answer: Elastic LoadBalancing is another cloud service provided by Amazon for managing the load of your traffic application. It is highly efficient in handling incoming traffic from various targets such as IP addresses and other virtual functions.

Following are types of load balancers, offered by AWS:

  • Network Load Balancer
  • Application Load Balancer
  • Gateway Load Balancer
  • Classic Load Balancer

40. What is the use of Network Load Balancer?

Answer: Network Load Balancers are best suited for managing the load of various protocols such as ITP and UDP. As compared to other load balancers, Network Load Balancers provide extremely efficient performance. It is capable of managing billions of server requests per second.

41. State the benefits of Elastic Beanstalk.

Answer: Some of the benefits that Elastic Beanstalk provides are:

  • Easy Deployment of the application
  • Enables autoscaling
  • Increases productivity of the developer
  • Pocket-friendly
  • Customization
  • Management and updating of the application

42. What type of subnet would you prefer to start if you have a VPC with private and public subnets?

Answer: Private subnets are best suited for launching in database servers. Since they cannot be accessed by the users who own the corresponding applications, they are the most eligible for backend services.

43. Why is Classic Load Balancer used?

Answer: Classic Load Balancer is the most primitive and simplest load balancer among all. It balances the load between various EC2 instances. Unlike other load balancers, it can function at the request level and the connection level.

44. State the layers available in cloud computing.

Answer:

  1. Infrastructure as a Service (IaaS): Iaas is the basic layer of infrastructure for instant computing in cloud IT. It facilitates services such as storage resources, and access to networking tools over the internet.
  2. Platform as a Service (PaaS): PaaS is a model for cloud computing that provides an environment for the deployment of applications in the cloud. It provides services and stacks for the deployment of applications. The platform it provides gives services such as databases, and OS and handles the scalability of the applications.
  3. Software as a Service(SaaS): SaaS is a browser-based user application. Saas is totally handled by the provider of the service. Applications that use Saas are, Saleforce.com, Web-based email, Office 365, etc.

45. What are the different storage classes provided by S3?

Answer: Below are the different storage classes provided by S3:

  • Standard frequency accessed
  • One-zone infrequency accessed
  • RRS – reduced redundancy storage
  • Standard infrequency accessed
  • Glacier

46. Define Gateway Load Balancer.

Answer: Gateway load balancer is majorly used in providing load balancing to third-party networking applications. Its transparency to the source as well as to the destination makes it most eligible for balancing the load of third-party applications. It also makes it efficient to scale and deploy your applications.

47. Explain the terms RTO and RPO?

Answer: In any business, there are always the chances of having some critical situations like failures or loss of data. In such cases, The two most crucial parameters are RTO and RPO which are concerned with the protection and backup recovery of your data.

RTO (Recovery Time Objective) is basically the maximum amount of time that can be given for the recovery in case of an interruption in the service.

RPO (Recovery Point Objective) is defined as the data that you can be lost at in case a critical situation occurs.

48. State the metrics retention period in Cloudwatch.

Answer: The metrics retention period in Cloudwatch are mentioned below:

Period of Datapoints Availability
60 seconds 3 hours
60 seconds 15 days
5 minutes 63 days
1 hour 455 days

49. State deployment models for the cloud?

Answer: Models for deployment over cloud are:

  • Public Cloud: All types of users are supported in this model.
  • Private Cloud: Only a single organization is supported as it is a private cloud model.
  • Hybrid Cloud: Private networks that are interconnected are supported by this model.
  • Community Cloud: More than one organization that is connected to a single network is supported by this model.

50. Can you provide any certification to give a boost to your application for this AWS role?

Answer: Possessing a certificate of the tech stack and skills that are required in the job description is always beneficial. This creates a positive impression on the interviewer that you are familiar with the required technology and have an in-depth understanding of the concepts as well as the practical applications. This also boosts up your resume and helps it to stand out, adding immense value to it as well as to your knowledge.

Wrapping Up!

In this guide, we discussed the top 50 interview questions on AWS that are most frequently asked. We covered all the aspects of AWS starting from the introduction of AWS and moving forward to advanced topics such as cloud computing models, scaling, EC2 & S3 instances, load balancing, and all the amazing services provided by AWS and why AWS has an upper hand on its counterparts. We skimmed through some important questions on these tools including their use, benefits, scope, etc.

We certainly hope that this guide helps you to revise all the concepts of AWS and its applications before you start hunting for Job Interviews and ace them with flying colors.

Happy Learning!

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