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Amazon Web Services (AWS) - Interview Questions and Answers for 'Cloud computing' - 57 question(s) found - Order By Newest

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 Q1. What are the factors on which price classes are based on in case of EC2, S3, CloudFront and EBS ?Amazon Web Services (AWS)
Ans. EC2 - Time and Reservation , Instance Type ( Memory , Computation power )
S3 - Accessibility Frequency , Data Transfer , Storage Space
CloudFront - Geography, No of Locations
EBS - IOPS, Access Frequency

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 Q2. What is cloud computing ?Cloud Computing
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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 Q3. Why is cloud infrastructure so powerful ?Cloud Computing
Ans. Because it gives the ability to provision infrastructure on Demand with No contracts and strings attached.

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 Q4. What is the use case for "On Demand" EC2 ?Amazon Web Services (AWS)
Ans. If the computation required is Spiky and unpredictable.

If it's first time use.

If the lifespan of the application isn't known.

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 Q5. What is the use case for "Spot" EC2 plan ?Amazon Web Services (AWS)
Ans. If the usage is non continuous and have flexible start and End Time. For ex - Analysis , Research , mining etc.

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 Q6. What are the different price options available for EC2 ?Amazon Web Services (AWS)
Ans. On Demand
Reserved
Spot
Dedicated Host

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 Q7. What EC2 configuration would you use if you have to use it for Bitcoin mining ?Amazon Web Services (AWS)
Ans. Keeping Low cost for processing , i would choose

Spot Price Plan
F1 or P3 Instance Type
Cold Hdd (SCI ) EBS Volume

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 Q8. Which AWS services would you use if you have find a cheapest solution for an analytics application ?Amazon Web Services (AWS)
Ans. Computation

Spot Price Plan
F1 or P3 Instance Type
Cold Hdd (SCI ) EBS Volume

Storage

S3-IA

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 Q9. 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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 Q10. What are the drawbacks of using Spot EC2 instances ?Amazon Web Services (AWS)
Ans. You cannot reserve the time slot and they can be made to use whenever they are available.

AWS can Terminate the EC2 instance on their own even if it's in use.

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 Q11. Can a EC2 instance have multiple Security Groups ? Can a single security group be assigned to multiple Ec2 instances ? If either of them is true , doesn't it result in conflict ?Amazon Web Services (AWS)
Ans. We can assign multiple security groups to single instance and we can use single security group with multiple instances.

It never results in conflict as security groups only have allow rules and no deny rules. Multiple security groups for an instance results in union of all rules.

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 Q12. What is the purpose of EC2 Health check ?Amazon Web Services (AWS)
Ans. We can use this check for variety of things -

1. Monitoring the status / Alarms in case it's down
2. Regulating traffic to healthy instances only through Load Balancer

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 Q13. What are the advantages and disadvantages of using Lambda over EC2 ?Amazon Web Services (AWS)
Ans. Advantages -

Much Cheaper
Continuous scaling
Higher level and Serverless

Disadvantages -

Warm up time
Limited flexibility in terms of technologies
Limited control

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 Q14. How would you secure EC2, Volume and Snapshots in Cloud ? Amazon Web Services (AWS)
Ans. Adding more security group, it works like a firewall

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 Q15. Difference between TCP and UDP ?Networking
Ans. http://www.cyberciti.biz/faq/key-differences-between-tcp-and-udp-protocols/

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 Q16. 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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 Q17. What is Amazon EC2 ?Amazon Web Services (AWS)
Ans. Amazon Elastic Compute Cloud or EC2 provides scalable computing capacity in the AWS cloud. It can be used to create Virtual Environments , storage and configure. EC2 enables to upgrade or downgrade infrastructure according to the rules defined ( with fluctuation in latency, traffic etc )

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 Q18. What is EC2 and EC2 instance ?Amazon Web Services (AWS)
Ans. EC2 is elastics compute cloud is one of the amazon service and ec2 instance is one type of virtual server which you create from AMI.

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 Q19. What are some of the vendors providing cloud computing infrastructure ?Server
 This question is still unanswered. Can you please provide an answer.


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 Q20. How cloud computing is different than virtualization ?Server
 This question is still unanswered. Can you please provide an answer.


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 Q21. What are some of the computation services provided by AWS ?Amazon Web Services (AWS)
Ans. EC2, EKS, EKC , Lambda

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 Q22. Can we reserve resources in AWS Lambda just like we do for Ec2 instances ?Amazon Web Services (AWS)
Ans. You can have reserved capacity with AWS Lambda. This guarantees that this number of concurrent Lambdas are always available for that function.

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 Q23. Why AWS is better than Azure ?Cloud Computing
 This question is still unanswered. Can you please provide an answer.


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 Q24. How do you usually choose which type of EC2 Instance you would like to Use ?Amazon Web Services (AWS)
Ans. Depend on its pricing module

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 Q25. What is elasticity in relation to Cloud infrastructure ?Cloud Computing
Ans. The power to scale computing resources up and down easily with minimal friction

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 Q26. What is the default limit on number of EC2 instances in each region ?Amazon Web Services (AWS)
Ans. 20

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 Q27. What is the use case for "Reserved" EC2 plan ?Amazon Web Services (AWS)
Ans. If the usage is continuous , stable and predictable.

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 Q28. What is the use case for "Dedicated Host" EC2 plan ?Amazon Web Services (AWS)
Ans. If there are regulatory requirements, or proprietary license to be used.

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 Q29. Which EC2 instance type should be used if the application is memory intensive ?Amazon Web Services (AWS)
Ans. R4

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 Q30. Which is the cheapest EC2 instance type ?Amazon Web Services (AWS)
Ans. T

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