With 3.6 billion people actively using Cloud Services in 2018, Cloud Computing has become popular than ever before. In this article, we will discuss the top Cloud Computing interview questions. 
With an unfathomable volume of data, it becomes cumbersome for industries to manage their data. Thus, Cloud Computing is like the straw to the drowning industries in the ocean of data. Amazon, Microsoft, Deloitte, Lockheed Martin, are among the top recruiters for cloud computing professionals.

Top 15 Cloud Computing Employers

cloud computing interview questions
(Source: Forbes)
According to a survey, the average salary of an entry-level cloud professional is around 8 lacs per annum, 12-15 lacs for professionals with under 3 years of experience, and for individuals with 10+ years of experience, the salary is a whopping 30 lacs or more.

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For all aspiring cloud computing architects, here is a curated list of cloud computing interview questions.

Top 30 Cloud Computing Interview Questions with their Answers

1. How will you describe Cloud Computing as concisely and simply to a Layman?

Even though this might sound like a fundamental question, this was asked in one of the interviews. (source- Quora)
Now, you must use simple words while answering this question. Use of technical terms is not advised.
In cloud computing, ‘cloud’ refers to the internet, metaphorically. So cloud computing is a method where internet acts as the fuel to computing services. You can now use the word- Internet-based computing. 

2. Give the best example of open source Cloud Computing.

Opensource cloud is a cloud service or solution that is built using opensource software and technologies. This includes any public, private or hybrid cloud model providing SaaS, IaaS, PaaS, or XaaS built and operated entirely on opensource technologies.
The best example of open source Cloud Computing is OpenStack.

3. What are system integrators in cloud computing?

System Integrators emerged into the scene in 2006. System integration is the practice of bringing together components of a system into a whole and making sure that the system performs smoothly.
A person or a company which specializes in system integration is called as a system integrator.

4. List the platforms which are used for large-scale cloud computing.

The timely processing of massive digital collection demands the use of large-scale distributed computing resources and the flexibility to customize the processing performed on the collections.
The platforms that are used for large-scale cloud computing are:
– Apache Hadoop
– MapReduce

5. Mention the different types of models used for deployment in cloud computing.

You need the perfect cloud deployment model to help you gain a competitive edge in the market. Through this, you will have access to IT resources and services that can make your business flexible and agile, both concerning volume and scale.
The different deployment models in cloud computing are:
– Private Cloud
– Public Cloud
– Community Cloud
– Hybrid Cloud

6. What do you mean by software as a service?

Software as a service (SaaS) is a software distribution model in which a third-party provider hosts applications and makes them available to their customers over the Internet. SaaS is one of three main categories of cloud computing, alongside infrastructure as a service (IaaS) and platform as a service (PaaS).

7. What is the platform as a service?

Platform as a service (PaaS) is a cloud computing model wherein a third-party provider delivers hardware and software tools. These tools usually comprise of those needed for the development of applications. PaaS services are provided to users over the internet. The provider hosts the hardware and software. As a result, PaaS gives users the flexibility to use service without installing hardware and software to run an application.

8. What is a private cloud?

Private cloud is one which delivers similar advantages to public cloud-like scalability and self-service. In the private cloud, this is done by using a proprietary architecture. Private clouds focus on the needs and demands of a single organization.
As a result, the private cloud is best for businesses with dynamic or unpredictable computing needs that require direct control over their environments. Security, governance, and regulation are best suited for private cloud services.
Private clouds are used to keep the strategic operations and others secure. It is a complete platform which is fully functional and can be owned, operated and restricted to only an organization or an industry. Nowadays, most of the organizations have moved to private clouds due to security concerns. Virtual private cloud is being used that operate by a hosting company.

9. What is the public cloud?

Be it a public or private cloud, the primary objective is to deliver services using the internet. Unlike a private cloud, public cloud services are the third party applications which can be used by anybody who wants to access them. The service may be free or be sold on demand.
Public clouds are open to people for use and deployment. For example Google and Amazon etc. The public clouds focus on a few layers like cloud application, providing infrastructure, and providing platform markets.

10. What are Hybrid Clouds?

Hybrid cloud is a cloud computing environment where we can use the services available to us locally, use third-party private services, and public services as well to meet the demand. By allowing workloads to move between private and public clouds as computing needs and costs change, hybrid cloud gives businesses greater flexibility and more data deployment options.
Hybrid clouds are a combination of public clouds and private clouds. It is preferred over both the clouds because it applies the most robust approach to implement cloud architecture. It includes the functionalities and features of both worlds. It allows organizations to create their cloud and allow them to give control over to someone else as well.

11. What is the difference between cloud computing and mobile computing?

Cloud Computing is when you store your files and folders in a “cloud” on the Internet, this will give you the flexibility to access all your files and folders wherever you are in the world– but you do need a physical device with Internet access to access it.
Mobile computing is taking a physical device with you. This could be a laptop or mobile phone or some device. Mobile computing and cloud computing are somewhat analogous. Mobile computing uses the concept of cloud computing. Cloud computing provides the users with the data which they require while in mobile computing, applications run on the remote server and give the user access for storage and managing the data.

12. What is the difference between scalability and elasticity?

Scalability is a characteristic of cloud computing which is used to handle the increasing workload by increasing in proportion amount of resource capacity. By the use of scalability, the architecture provides on-demand resources if the traffic is raising the requirement. Whereas, Elasticity is a characteristic which provides the concept of commissioning and decommissioning of a large amount of resource capacity dynamically. It is measured by the speed at which the resources are on-demand and the usage of the resources.

13. What are the security benefits of cloud computing?

Complete protection against DDoS: Distributed Denial of Service attacks have become very common and are attacking cloud data of companies. So the cloud computing security ensures restricting traffic to the server. Traffic which can be a threat to the company and their data is thus averted.
Security of data: As data develops, data breaching becomes a significant issue and the servers become soft targets. The security solution of cloud data helps in protecting sensitive information and also helps the data to stay secure against a third party.
Flexibility feature: Cloud offers flexibility, and this makes it popular. The user has the flexibility to avoid server crashing in case of excess traffic. When the high traffic is over, the user can scale back to reduce the cost.
Cloud computing authorizes the application server, so it is used in identity management. It provides permissions to the users so that they can control the access of another user who is entering into the cloud environment.

14. What is the usage of utility computing?

Utility computing, or The Computer Utility, is a service provisioning model in which a service provider makes computing resources and infrastructure management available to the customer as needed and charges them for specific usage rather than a flat rate
Utility computing is a plug-in managed by an organization which decides what type of services has to be deployed from the cloud. It facilitates users to pay only for what they use.

15. Explain Security management regarding Cloud Computing.

– 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 provide access to authorized and authenticated users only to access the data and applications

16. How would you secure data for transport in the cloud?

This is a frequently asked question. Don’t forget to dive in more in-depth on this topic.
When transporting data in a cloud computing environment, keep two things in mind: Make sure that no one can intercept your data as it moves from point A to point B in the cloud, and make sure that no data leaks (malicious or otherwise) from any storage in the cloud.
A virtual private network (VPN) is one way to secure data while it is being transported in a cloud. A VPN converts the public network to a private network instead. A well-designed VPN will incorporate two things:
A firewall that will act as a barrier between the public and any private network.
Encryption protects your sensitive data from hackers; only the computer that you send it to should have the key to decode the data.
Check that there is no data leak with the encryption key implemented with the data you send while it moves from point A to point B in a cloud.

17. What are some large cloud providers and databases?

Following are the most used large cloud providers and databases:
– Google BigTable
– Amazon SimpleDB
– Cloud-based SQL

18. List the open-source cloud computing platform databases?

Following are the open-source cloud computing platform databases:
– MongoDB
– CouchDB
– LucidDB

19. Explain what is the full form and usage of “EUCALYPTUS” in cloud computing.

“EUCALYPTUS” 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 the cloud computing platform. The main application of eucalyptus is to build public, hybrid, and private clouds. Using this, you can produce your personalized data center into a private cloud and leverage it to various other organizations to make the most out of it and use the functionalities offered by eucalyptus.

20. Explain public, static, and void class.

Public: This is an access modifier, it is used to specify who can access a particular method. When you say public, it means that the method is accessible to any given class.
Static: This keyword in Java tells us that it is class-based, this means it can be accessed without creating the instance of any particular class.
Void: Void defines a method which does not return any value. So this is the return related method.

21. Explain the difference between cloud and traditional data centers.

In a traditional data center, the major drawback is the expenditure. A traditional data center is comparatively expensive due to heating, hardware, and software issues. So, not only is the initial cost higher, but the maintenance cost is also a problem.
Cloud being scaled when there is an increase in demand. Mostly the expenditure is on the maintenance of the data centers, while these issues are not faced in cloud computing.
22. List down the three necessary functioning clouds in cloud computing.
– Professional cloud
– Personal cloud
– Performance cloud

23. What are the building blocks in cloud architecture?

– Reference architecture
– Technical architecture
– Deployment operation architecture
– Reference architecture
– Technical architecture
– Deployment operation architecture

24. What do you mean by CaaS?

CaaS is a terminology used in the telecom industry as Communication As a Service. CaaS offers to the enterprise user features such as desktop call control, unified messaging, and desktop faxing.

25. What are the advantages of cloud services?

Following are the main advantages of cloud services:
Cost-saving: It helps in the utilization of investment in the corporate sector. So, it is cost saving.
Scalable and Robust: It helps in developing scalable and robust applications. Previously, the scaling took months, but now, scaling takes less time.
Time-saving: It helps in saving time regarding deployment and maintenance.

26. How can a user gain from utility computing?

Utility computing allows the user to pay only for what they are using. It is a plug-in managed by an organization which decides what type of services has to be deployed from the cloud.
Most organizations prefer a hybrid strategy.

27. Before going for cloud computing platform, what are the essential things to be taken in concern by users?

– Compliance
– Loss of data
– Data storage
– Business continuity
– Uptime
– Data integrity in cloud computing.

28. Give A Brief Introduction Of Windows Azure Operating System.

The Windows Azure operating system is used for cloud services to be run on the Windows Azure Platform. Azure is preferred as it includes the essential features for hosting all the services in the cloud. You also get a runtime environment which consists of a Web Server, Primary Storage, Management services, load balancers among others. The Windows Azure system provides the fabric for development and testing of services before their deployment on the Windows Azure in the cloud.

29. Mention About The Top Cloud Applications Now A Days?

Top cloud computing applications include Google docs which are very fast and secure. There is also a mobile version of google docs so you can access your data from a smartphone. Pixlr and Phoenix, jaycut also are the applications used for cloud computing.

30. What are the different data types used in Cloud Computing?

There are different data types in cloud computing like emails, contacts, images, blogs, etc. As we know that data is increasing day by day so it is needed for new data types to store these new data. For example, if you want to store video then you need a new data type.
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So we wrap up with our questions here, these questions will help you in the interview, All The Best!
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