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 Q151. Which EBS Volume is suitable if we need to install SQL with every high requests per second ?Amazon Web Services (AWS)
Ans. We can use "Provisioned IOPS SSD"

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 Q152. 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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 Q153. 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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 Q154. What are the different price options available for EC2 ?Amazon Web Services (AWS)
Ans. On Demand
Reserved
Spot
Dedicated Host

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 Q155. 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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 Q156. 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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 Q157. 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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 Q158. 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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 Q159. What is the use case for Amazon Glacier ?Amazon Web Services (AWS)
Ans. Amazon Glacier is used for storing archieved files / objects and hence well suited for files where retrieval time isn't that important.

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 Q160. What is the use case of aws S3-IA ?Amazon Web Services (AWS)
Ans. IA stands for infrequently accessed and hence it's suited for files / objects are expected to be accessed infrequently.

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 Q161. What could be done if we try to upload a file larger than the allowed size in S3 ?Amazon Web Services (AWS)
Ans. We can use multi part upload API

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 Q162. What is AWS Storage Gateway?Amazon Web Services (AWS)
Ans. It's an on premise virtual appliance that can be used as cache to store s3 locally at customer site.

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 Q163. How can we restrict CloudFront Access ?Amazon Web Services (AWS)
Ans. Price Class
Geo Targeting
Signed Urls , Signed Cookies

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 Q164. How can we restrict CloudFront access to a particular Geography ?Amazon Web Services (AWS)
Ans. We can select the appropriate Price Class if that suits us.

We can do Geo Targeting by black listing / white listing certain geographies.

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 Q165. What are the different things we can restrict CloudFront access on ?

Amazon Web Services (AWS)
Ans. 1. Protocol ( http, https )
2. Url Pattern ( *, /abc* )
3. Operation ( Put , Post , Delete etc )
4. Geo

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 Q166. What is origin and distribution wrt to AWS CloudFront ?Amazon Web Services (AWS)
Ans. Origin is the origin of File or services which CloudFront distributes like S3 in US East-1

Distribution is the combination of Edge locations that helps in the distribution of content / service.

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 Q167. What is CDN ? Which AWS service is used for it ?Amazon Web Services (AWS)
Ans. CDN is Content Delivery Network
AWS CloudFront provides CDN service

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 Q168. Does S3 prices vary by region ?Amazon Web Services (AWS)
Ans. Yes

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 Q169. Which AWS service can help S3 with distribution data ?Amazon Web Services (AWS)
Ans. AWS CloudFront

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 Q170. What are the different types of encryption provided by AWS S3 ?Amazon Web Services (AWS)
Ans. In Transit ( SSL / TSL )
At Rest Server Encryption ( SSE-S3, SSE-KMS, SSE-C )

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 Q171. Can we log all S3 accesses ?Amazon Web Services (AWS)
Ans. Yes

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 Q172. Can we do Lifecycle management in S3 without versioning enabled ?Amazon Web Services (AWS)
Ans. Yes

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 Q173. How can we archieve S3 objects after certain interval ?Amazon Web Services (AWS)
Ans. We can use S3 lifecycle management to transition older objects into AWS Glacier.

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 Q174. Can we do replication to multiple regions and buckets simultaneously ?Amazon Web Services (AWS)
Ans. No, its not allowed currently.

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 Q175. 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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 Q176. 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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 Q177. 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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 Q178. 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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 Q179. 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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 Q180. 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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