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Ans. Cloud Computing is a way of using IT infrastructure with following traits -

1. On Demand Infrastructure
2. Broad Network Access
3. Resource Pooling
4. Rapid Elasticity
5. Measured Service

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Q2. Why is cloud infrastructure so powerful ?

Ans. Because it gives the ability to provision infrastructure on Demand with No contracts and strings attached.

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Q3. Write a method to check if input String is Palindrome?

Ans. private static boolean isPalindrome(String str) {

if (str == null)
return false;

StringBuilder strBuilder = new StringBuilder(str);

strBuilder.reverse();

return strBuilder.toString().equals(str);

}

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Q4. What are the reasons to choose between reserved and on demand instances ?

Server

Ans. In terms of compute options and configurations, Reserved Instances and On Demand instances are the same. The only difference between the two is that a Reserved Instance is one you rent (reserved) for a fixed duration, and in return you receive a discount on the base price of an On Demand instance.

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Q5. Is Google App Engine , IAAS, PAAS or SAAS ?

Ans. It's PAAS ( Platform as a service )

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Q6. What are the platforms supported by Java Programming Language?

Ans. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX/Linux like HP-Unix, Sun Solaris, Redhat Linux, Ubuntu, CentOS, etc

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Q7. What is Java bytecode ?

Ans. Java bytecode is the instruction set of the Java virtual machine. Each bytecode is composed by one, or two bytes that represent the instruction, along with zero or more bytes for passing parameters.

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Q8. Is JVM a overhead ?

Ans. Yes and No. JVM is an extra layer that translates Byte Code into Machine Code. So Comparing to languages like C, Java provides an additional layer of translating the Source Code.

C++ Compiler - Source Code --> Machine Code
Java Compiler - Source Code --> Byte Code , JVM - Byte Code --> Machine Code

Though it looks like an overhead but this additional translation allows Java to run Apps on all platforms as JVM provides the translation to the Machine code as per the underlying Operating System.

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Q9. What is Byte Code ? Why Java's intermediary Code is called Byte Code ?

Ans. Bytecode is a highly optimized set of instructions designed to be executed by the Java run-time system. Its called Byte Code because each instruction is of 1-2 bytes.

Sample instructions in Byte Code -

1: istore_1
2: iload_1
3: sipush 1000
6: if_icmpge 44
9: iconst_2
10: istore_2

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Q10. What is meant Java is "Write Once Run Anywhere" ?

Ans. It means that Java is compiled to byte code that is platform independent and hence can be run anywhere or any machine.

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Q11. What is a platform ? Is Java a Software or Hardware platforms ?

Ans. Platform is the environment in which a program runs. Java provides a software platform for running JVM based applications and programs.

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Q12. What are the different layers of cloud computing ?

Infrastructure

Ans. Paas - Platform as a service
Iaas - Infrastructure as a service
Saas - Software as a service

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Q13. How cloud computing is different than virtualization ?

Server

Ans. A Virtualization is software that virtualizes your hardware into multiple machines while Cloud computing is the combination of multiple hardware devices. In Virtualization, a user gets dedicated hardware while in Cloud computing multiple hardware devices provide one login environment for the user.

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Q14. What is elasticity in relation to Cloud infrastructure ?

Ans. The power to scale computing resources up and down easily with minimal friction

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Q15. What is life cycle of cloud deployment process ?

^{This question was recently asked at 'Barclays'.This question is still unanswered. Can you please provide an answer.}

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Q16. What are the types of clouds in cloud computing ?

Ans. Private, Public, Hybrid, Community

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Q17. Have you ever worked on Google Cloud Platform ?

Google Cloud Platform

^{This question is still unanswered. Can you please provide an answer.}

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Q18. Explain Virtual machines in Google Cloud Platform.

Ans. Virtual machines are IAAS in GCP which can called Compute Engine

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Q19. Explain Identity management in GCP ?

Ans. IAM is used to define the level of access to GCP services

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Q20. How does cloud computing helps saves cost ?

Ans. Cloud computing helps saving overall cost for infrastructure and service usage through following -

1. On demand Services and elasticity - You only pay for what you use. Less Ideal time.

2. Resource Pooling

3. Self Service - Less involvement of human resources

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Q21. What are the different types of Services GCP provides ?

Ans. Compute
Network
Storage
Big Data
Machine Learning

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Q22. What is the difference between Billing Alerts and Budget Quotas in GCP ?

Ans. Alerts only let customer knows of any excessive usage whereas Quota restricts the usage beyond a certain point.

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Q23. How Resource Pooling helps saving cost ?

Ans. With resource pooling and Pay as per use , Bigger companies like Google and Amazon can buy Large physical hardware and employ economy of scale and hence resulting in cost saving for customers.

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Q24. How On demand Self Service helps saving cost ?

Ans. On Demand service restricts cost by paying only for the use and Self Service saves cost by reducing intermediary human resource cost.

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Q25. What are some GCP Billing and Budgeting services ?

Ans. Budgets and Alerts
Reports
Quotas

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Q26. How would you secure resources in Cloud ?

Ans. There are multiple types of security GCP provides to every customer. Data, Network, Compute, and Services. Each service have its own security layer and Google provides clients to build as per the GCP best practices like building VPC, IAM, Firewall rules and so on

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Q27. What are the libraries and tools for cloud storage on GCP ?

Ans. Console - GUI Interface
gsutil - Command Line Interface
Rest API - Using JSON or XML API

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Q28. What do you know about Google Compute Engine ?

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Q29. How are the Google Compute Engine and Google App Engine related ?

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Q30. How does the pricing model work in GCP cloud ?