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Q31. Can we associate a single EFS volume with multiple EC2 instances ?

Amazon Web Services (AWS)

Ans. Yes

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Q32. Can we associate a single EBS volume with multiple EC2 instances ?

Amazon Web Services (AWS)

Ans. No

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Q33. What are the factors on which Lambda usage is priced ?

Amazon Web Services (AWS)

Ans. No of requests, computation duration, assigned RAM

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Q34. 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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Q35. Are you using Auto Scaling for your EC2 instances ? How have you configured Auto scaling policy ?

Amazon Web Services (AWS)

Ans. yes, you can create auto scaling policy to set max and min no of instance.

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Q36. 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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Q37. Can we modify volume while attached EC2 is running ?

Amazon Web Services (AWS)

Ans. Yes, except Magnetic standard

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Q38. Can we have EC2 and EBS in different availability zones or regions ?

Amazon Web Services (AWS)

Ans. No, they need to be local

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Q39. 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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Q40. Which AWS service can be used to monitor EC2 ?

Amazon Web Services (AWS)

Ans. CloudWatch

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Q41. What is the difference between EC2 System status check and Instance status check ?

Amazon Web Services (AWS)

Ans. System status check is to check if the power or network is working whereas Instance status check goes further and make sure that traffic is going through.

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Q42. Can we protect EC2 instances from terminating accidentally ?

Amazon Web Services (AWS)

Ans. Yes

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Q43. Difference between EC2 instance public and private key ?

Amazon Web Services (AWS)

Ans. public key is used for locking whereas private key is used for unlocking. public key can be used for locking multiple instances and hence can be shared.

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Q44. Does attached EBS volume get deleted if we terminate EC2 instance ?

Amazon Web Services (AWS)

Ans. By default, Root volume gets terminated whereas additional volume doesn't.

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Q45. What are the things to consider while provisioning computing in AWS ?

Amazon Web Services (AWS)

Ans. Service ( EC2, Lambda etc )
AMI ( Operating System and Softwares )
Instance Type ( T,M, R etc )
EBS ( Volume Type , Size )
Price Class ( OnDemand, Dedicated etc )

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Q46. How can EBS Volumes be backed up ?

Amazon Web Services (AWS)

Ans. Through Snapshots

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Q47. Import / Export can import data set from ..

Amazon Web Services (AWS)

Ans. S3, EBS and Glacier

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Q48. Can we change the instance Type while it's running ?

Amazon Web Services (AWS)

Ans. No

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Q49. Which is the most common EC2 instance Type ?

Amazon Web Services (AWS)

Ans. T and M

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Q50. 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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Q51. 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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Q52. What are the different EC2 instance types ?

Amazon Web Services (AWS)

Ans. F,I,G,H,T,D,R,M,C,P,X

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Q53. Which is the cheapest EC2 instance type ?

Amazon Web Services (AWS)

Ans. T

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Q54. Which EC2 instance type should be used if the application is memory intensive ?

Amazon Web Services (AWS)

Ans. R4

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Q55. 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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Q56. 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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Q57. What are the different price options available for EC2 ?

Amazon Web Services (AWS)

Ans. On Demand
Reserved
Spot
Dedicated Host

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Q58. 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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Q59. 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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Q60. 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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