Amazon Web Services (AWS) - Interview Questions and Answers for 'Amazon cloud storage' | Search Interview Question

Amazon Web Services (AWS) - Interview Questions and Answers for 'Amazon cloud storage' - 48 question(s) found - Order By Newest

Q1. What the difference between S3 and EFS ?

Amazon Web Services (AWS)

Ans. EFS is file storage whereas S3 is object storage.

EFS is filesystem presented over IP network as normal OS drive, while S3 is HTTP accessed store.

EFS is capable of being mounted whereas S3 doesn't.

S3 has capabilities beyond just filesystem, there is whole metadata part where you can store info about your objects in S3.

As S3 is accessed over http , it's capable of hosting a static web site on it's own whereas EFS needs a computing and frontend service to have such capability.

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Q2. What are the different S3 storage Tiers ?

Amazon Web Services (AWS)

Ans. S3 Standard
S3 IA - Infrequently Accessed
S3 One Zone IA - One Zone only , Infrequently Accessed
S3 Glacier - achieved

S3 Standard is most expensive , Glacier is least expensive

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Q3. What are the factors on which customers are charged for using S3 ?

Amazon Web Services (AWS)

Ans. Storage Tier ( IA , Standard , Glacier etc )
Storage ( Volume of Data )
No of Requests
Meta Data
Data Transfer Speed acceleration through cache and Edge Location

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Q4. 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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Q5. Within AWS S3, Why new files are available immediately for read operation but not the updates ?

Amazon Web Services (AWS)

Ans. Because new files will be fed from where ever they are first available but AWS have no way to identify which is the most updated version among the various regions. The updated version can only be assured once the replication to all availability zones is complete.

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Q6. What kind of Access Policy should be kept on S3 Buckets and Policy ?

Amazon Web Services (AWS)

Ans. We should only allow access that's needed. So the security Policy should be as restrictive as possible.

Buckets and Files should never be made public unless until they are needed it to be like that.

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Q7. How can we protect from accidental deletes in S3 ?

Amazon Web Services (AWS)

Ans. Versioning ( will create Delete marker )
MFA Delete ( authentication upon deletion )
Cross Region Replication ( Replicates aren't deleted )

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Q8. Difference between S3 and EFS ?

Amazon Web Services (AWS)

Ans. S3 is object based whereas EFS is block based.

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Q9. What is Amazon S3 ?

Amazon Web Services (AWS)

Ans. Amazon Simple Storage Service or S3 is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web.

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Q10. What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ?

Amazon Web Services (AWS)

Ans. Just like people , AWS resources too have execution roles or permissions. Seems like in such a situation Lambda function may not have sufficient privileges to perform operations on S3. For example - The execution role of Lambda may just have read permissions on S3 and we may be trying to perform PutObject operation.

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Q11. Can making the S3 bucket public ,makes all objects / files inside as public too ?

Amazon Web Services (AWS)

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

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Q12. How can we make an S3 file public through Java program ?

Amazon Web Services (AWS)

Ans. We can get the object and then can set CannedAcl property as "PublicRead"

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Q13. What is the scale of durability in Amazon S3?

Amazon Web Services (AWS)

Ans. 99.999999999%

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Q14. How will you upload a file greater than 100 megabytes in Amazon S3?

Amazon Web Services (AWS)

Ans. AWS now allows file upto 5GB in S3

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Q15. Can we do Cross Region replication in Amazon S3 without enabling versioning on a bucket?

Amazon Web Services (AWS)

Ans. Yes

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Q16. What are the different types of actions in Object Lifecycle Management in Amazon S3?

Amazon Web Services (AWS)

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

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Q17. Difference between S3 bucket and Folder ?

Amazon Web Services (AWS)

Ans. Bucket is the highest level folder whose name should be unique globally.

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Q18. What is the maximum size of a file in S3 ?

Amazon Web Services (AWS)

Ans. 5 TB

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Q19. Can we host a website in S3 ?

Amazon Web Services (AWS)

Ans. Yes a static website can be hosted in S3.

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Q20. What are the different ways to secure objects in S3 ?

Amazon Web Services (AWS)

Ans. Encryption - In Transit , Client Side , Server Side
Restrictive Access - ACL , Bucket Policy

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Q21. What status code is returned upon successful upload in S3 ?

Amazon Web Services (AWS)

Ans. 200

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Q22. What is the default visibility of buckets and objects when they are uploaded in S3 ?

Amazon Web Services (AWS)

Ans. private

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Q23. Can we make objects public in a bucket which is not public ?

Amazon Web Services (AWS)

Ans. No

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Q24. What is the difference between client side and server side encryption wrt to S3 objects ?

Amazon Web Services (AWS)

Ans. Client side encryption is done by the users on their machines whereas server side encryption is done by AWS when objects are uploaded in S3.

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Q25. If we have enabled versioning for S3 bucket, Do we need to make all new versions public whenever new versions are uploaded ?

Amazon Web Services (AWS)

Ans. Yes, all new versions are private by default even if the original file has been made public.

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Q26. What is a delete marker wrt to S3 objects ?

Amazon Web Services (AWS)

Ans. If the objects / bucket is versioned in S3, Any delete operation on S3 object doesn't physically deletes the object but rather creates a delete marker version. We need to delete the delete marker to physically delete it.

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Q27. Can we do Cross Region replication in S3 without versioning ?

Amazon Web Services (AWS)

Ans. No , Both the source and destination should have versioning enabled.

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Q28. Does deletion of an object gets replicated too if we have cross region replication enabled on a bucket ?

Amazon Web Services (AWS)

Ans. No, delete markers are not replicated.

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Q29. Can we do replication within the same region i.e into a new bucket within same region ?

Amazon Web Services (AWS)

Ans. No. Replication is only allowed across regions. We can manually copy into other bucket though.

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Q30. Can we do replication to multiple regions and buckets simultaneously ?

Amazon Web Services (AWS)

Ans. No, its not allowed currently.

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