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Top Cloud Computing Interview Questions – Most Asked

Cloud Computing Interview Questions
Here we have a set of top asked Cloud computing interview questions that can help you clear your cloud job interview. You will learn different layers of cloud architecture, APIs for cloud, main components of AWS and Azure, cloud availability and reliability, layers of PaaS architecture, cloud service models, importance of Hybrid cloud, cloud security management and more. Learn cloud computing from Intellipaat AWS certification training and excel in your career.

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Top Answers to Cloud Computing Interview Questions

1. Compare Cloud and On-premise Computing?
Initial costLowHigh
Maintenance & SupportHassle-freeNeeds attention
Pay as you goYesNo
2. What is a Cloud?

A cloud is a collaboration of networks, hardware, services, storage, and interfaces that helps in delivering computing as a service. It has three users:

  1. End users
  2. Business management users
  3.  Cloud service provider
3. What is Cloud Computing?

It is advance stage technology implemented so that the cloud provides the services globally as per the user requirements. It provides a method to access several servers worldwide.

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4. What are the benefits of cloud computing?

The main benefits of cloud computing are:

  •  Data backup and storage of data.
  •  Powerful server capabilities.
  •  Incremented productivity.
  •  Cost effective and time saving.
5. Mention the Layers of PaaS Architecture.

Cloud Controller

  • Automatically creates Virtual machines and controllers.
  •  Deploys Applications
  • Connects to services
  • Automatically scales Ups and Downs.

Storage Services

  • Object
  • NoSQL
  • Relational
  • Block Storage

Applications store in storage services

  • Simple to scale applications
  • Easier recovery from failure
6. What are the Cloud Service Models?

Infrastructure as a service (IaaS)
Platform as a service (PaaS)
Software as a service (SaaS)

7. What are the components of Windows Azure?

Windows Azure platform services

  •  The Cloud
  • SQL Azure
  •  App Fabric: Allows fabric cloud
8. What are the differences occurred in Distributed operations?

FC: Master-Slave operations
Nova: Parallel process and its shared database.

9. Which agent is equivalent of Nova Compute?

Azure Agent

10. Mention the Reliability and Availability of Cloud Computing.

Use of fault domains:

  • Two virtual machines are in single fault domain if a single hardware can bring down both the virtual machines.
  • Azure automatically distributes instances of a role across fault domains.

Use of Upgrade Domains:

  • When new version of software is rolled out, then only one up gradation of domain is done at a time.
  • Ensures that some instance of the service is always available.
  • Availability of the applications in the multiple instances

Storage and Network Availability:

  • Copies of data are stored in different domains.
  • Mechanism to guard against DoS and DDoS attacks.
11. Give the best example for open source Cloud Computing.


12. Explain the Common storage of PaaS Architecture.

Cloud Controller:

  • Automatically creates the virtual machines and containers.
  • Deploys applications
  • Connects to services
  • Automatically scales ups and downs

Storage Services:

  • Object
  • NoSQL
  • Relational
  • Block Storage

Applications store state in storage services:

  • Simple to scale applications
  • Easier recovery from failure.
13. Why Hybrid Clouds are so important?

Cloud Bursting:
Access capacity or specialized software are available in public cloud and not in private cloud.
Examples: Virtual Amazon and Dynamo

Leverage best of both worlds:

  • It is VM Ware cloud
  • It is Expensive
  • Enterprise quality


  • It has commodity servers and storage.
  • It is less reliable.
  • We can run Web servers on OpenStack.
  • Database is built on VCloud.
14. List the platforms which are used for large scale cloud computing.

The platforms that are used for large scale cloud computing are

  •  Apache Hadoop
  • MapReduce
15. Mention the different types of models used for deployment in Cloud Computing.

The different deployment models in cloud computing are

  • Private Cloud
  • Public Cloud
  • Community Cloud
  • Hybrid Cloud
16. Explain the Security management in terms of Cloud Computing.
  • The Identity management access provides the authorization of application services.
  • Access control permission is given to the users to have complete controlling access of another user who is entering into the cloud environment.
  • Authentication and Authorization provides access to only the authorized and authenticated users only to access the data and applications.
17. Which are the Layers that the scope of Cloud Computing?

The different layers used by cloud architecture are as follows:

  • CLC or also known as Cloud Controller
  • Walrus
  • Cluster Controller
  • Storage Controller(SC)
  • Node Controller(NC)
18. Explain what is the full form and usage of “EUCALYPTUS” in cloud computing.

“EUCALYPTUS” full form stands for Elastic Utility Computing Architecture for Linking Your Programs to Useful Systems”.
“Eucalyptus” is an open source software infrastructure in cloud computing, which enables us to implement clusters in cloud computing platform. It is mainly used to build public, hybrid and private clouds. It has the capabilities to produce your own data center into a private cloud and provides to use its all functionality for various other organizations.

19. Mention the name of some large cloud providers and databases.
  • Google Big table
  • Amazon Simple Database
  • Cloud based SQL(Sequential Query Language)


20. Explain the difference between cloud and traditional datacenters.
  • The expenditure of the traditional data center is expensive due to heating and hardware/software issues
  • Cloud being scaled when there is an increase in demand. Mostly the expenditure is on the maintenance of the data centers, while this issues are not faced in cloud computing.
21. What are the uses of API’s in cloud services?
  • API’s (Application Programming Interface are used to eliminate the necessity to write the complete programs.
  • The instructions are provided to make communication between one or more applications.
  • Creation of applications is made easy and access for the link of cloud services with other systems.
22. Mention the different datacenters deployment of cloud computing.

Cloud computing consists of different datacenters such as :

  • Containerized datacenters – Containerized datacenters are the packages that contain consistent set of servers, network components and storage delivered to large warehouse kind of facilities. Here each deployment is relatively unique.
  • Low-density datacenters – Containerized datacentres promote heavy density which in turn causes much heat and significant engineering troubles. Low density datacentres are the solution to this problem. Here the equipment is established far apart so that it cools down the generated heat.
23. List down the three basic functioning clouds in cloud computing.
  • Professional cloud
  • Personal cloud
  • Performance cloud
24. What are the characteristics of cloud architecture that differs from traditional cloud architecture?

The characteristics are:

  •  The hardware requirement is being provided as per the demand created for cloud architecture.
  • Cloud architecture is capable of scaling the resource on demand created.
  • Cloud architecture is capable of managing and handling dynamic workloads without any point of failures.
25. What are the building blocks in cloud architecture?
  • Reference architecture
  • Technical architecture
  • Deployment operation architecture
  • Reference architecture
  • Technical architecture
  • Deployment operation architecture
26. Explain AWS.

AWS stands for Amazon Web Service which is a collection of remote computing services also known as cloud computing. This technology of cloud computing is also known as IaaS or Infrastructure as a Service.

27. Mention the key components of AWS.

The key components of AWS are as follows:

  • Route 53: A DNS (Domain Name SERVER) web based service platform.
  • Simple E-mail Service: Sending of E-mail is done by using RESTFUL API call or via regular SMTP (Simple Mail Transfer Protocol).
  • Identity and Access Management: Improvised security and Identity management is provided for AWS account.
  • Simple Storage Device or (S3): It is a huge storage medium, widely used for AWS services.
  • Elastic Compute Cloud (EC2): Allows on-demand computing resources for hosting applications and essentially useful for unpredictable workloads
  • Elastic Block Store (EBS): Storage volumes which is being attached to EC2 and allows the data lifespan of a single EC2
  • Cloud Watch: It is used to monitor AWS resources and it allows administrators to view and collect keys required. Access is provided so that one can set a notification alarm in case of trouble.
28. Explain how can I vertically scale an Amazon instance.

This is one of the essential features of AWS and cloud virtualization. SpinUp a newly developed large instance where we pause that instance and detach the root Ebs volume from the server and discard. Later stop your live instance, detach its root volume connected. Note down the unique device ID and attach the same root volume to the new server. And restart it again. This results in vertically scaled Amazon instance.

29. Explain the security usage in Amazon Web Services model.
  • AWS supports security groups.
  • Access is provided to create a security group for a jump box with ssh access only for port 22 open. Later a web server group and database group are created. The web server group provides 80 and 443 from around the world, but only port 22 are vital among the jump box group. Database group allows port 3306 from the web server group and port 22 from the jump box group. Addition of any machines to the web server group can store in the database. No one can directly ssh to any of your boxes.
30. What are reasons that made Amazon so big?
  • Backup storage of EBS volumes is maintained by inserting the snapshot facility via API call or via a GUI interface like elasticfox.
  • Performance is improved by using Linux software raid and striping across four volumes.
31. What is an AMI? How do we implement it?
  • AMI stands for Amazon Machine Image. It is basically a copy of the root file system.
  • Provides the data required to launch an instance, which means a copy of running an AMI server in the cloud. It’s easy to launch an instance from many different AMIs.
  • Hardware servers that commodities bios which exactly point the master boot record of the first block on a disk. A disk image is created which can easily fit anywhere physically on a disk .Where Linux can boot from an arbitrary location on the EBS storage network.

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