Which of the following are use cases for Amazon DynamoDB? Choose 3 answers
Correct Answer:CEF
You have a lot of data stored in the AWS Storage Gateway and your manager has come to you asking about how the billing is calculated, specifically the Virtual Tape Shelf usage. What would be a correct response to this?
Correct Answer:B
The AWS Storage Gateway is a service connecting an on-premises software appliance with cloud-based storage to provide seamless and secure integration between an organization’s on-premises IT environment and AWS’s storage infrastructure.
AWS Storage Gateway billing is as follows. Volume storage usage (per GB per month):
You are billed for the Cached volume data you store in Amazon S3. You are only billed for volume capacity you use, not for the size of the volume you create.
Snapshot Storage usage (per GB per month): You are billed for the snapshots your gateway stores in Amazon S3. These snapshots are stored and billed as Amazon EBS snapshots. Snapshots are incremental backups, reducing your storage charges. When taking a new snapshot, only the data that has changed since your last snapshot is stored.
Virtual Tape Library usage (per GB per month):
You are billed for the virtual tape data you store in Amazon S3. You are only billed for the portion of virtual tape capacity that you use, not for the size of the virtual tape.
Virtual Tape Shelf usage (per GB per month):
You are billed for the virtual tape data you store in Amazon Glacier. You are only billed for the portion of virtual tape capacity that you use, not for the size of the virtual tape.
Reference: https://aws.amazon.com/storagegateway/faqs/
A user is planning a highly available application deployment with EC2. Which of the below mentioned options will not help to achieve HA?
Correct Answer:B
In Amazon Web Service, the user can achieve HA by deploying instances in multiple zones. The elastic IP helps the user achieve HA when one of the instances is down but still keeps the same URL. The AM helps launching the new instance. The PIOPS is for the performance of EBS and does not help for HA. Reference: http://media.amazonwebservices.com/AWS_Web_Hosting_Best_Practices.pdf
Amazon SWF is designed to help users
Correct Answer:D
You have some very sensitive data stored on AWS S3 and want to try every possible alternative to keeping it secure in regards to access control. What are the mechanisms available for access control on AWS S3?
Correct Answer:A
Amazon S3 supports several mechanisms that give you filexibility to control who can access your data as well as how, when, and where they can access it.
Amazon S3 provides four different access control mechanisms:
AWS Identity and Access Management (IAM) policies, Access Control Lists (ACLs), bucket policies, and query string authentication.
IAM enables organizations to create and manage multiple users under a single AWS account. With IAM policies, you can grant IAM users fine-grained control to your Amazon S3 bucket or objects. You can use ACLs to selectively add (grant) certain permissions on indMdual objects.
Amazon S3 bucket policies can be used to add or deny permissions across some or all of the objects within a single bucket.
With Query string authentication, you have the ability to share Amazon S3 objects through URLs that are valid for a specified period of time.