Free AWS-Certified-DevOps-Engineer-Professional Exam Dumps

Question 16

You are experiencing performance issues writing to a DynamoDB table. Your system tracks high scores for video games on a marketplace. Your most popular game experiences all of the performance issues. What is the most likely problem?

A. DynamoDB's vector clock is out of sync, because of the rapid growth in request for the most popular game.
B. You selected the Game ID or equivalent identifier as the primary partition key for the table.
C. Users of the most popular video game each perform more read and write requests than average.
D. You did not provision enough read or write throughput to the tabl

Correct Answer:B
The primary key selection dramatically affects performance consistency when reading or writing to DynamoDB. By selecting a key that is tied to the identity of the game, you forced DynamoDB to create a hotspot in the table partitions, and over-request against the primary key partition for the popular game. When it stores data, DynamoDB dMdes a tabIe's items into multiple partitions, and distributes the data primarily based upon the partition key value. The provisioned throughput associated with a table is also dMded evenly among the partitions, with no sharing of provisioned throughput across partitions. Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GuideIinesForTabIes.htmI#GuideIi nesForTabIes.UniformWorkIoad

Question 17

For AWS CIoudFormation, which stack state refuses UpdateStack calls?

A. <code>UPDATE_ROLLBACK_FAILED</code>
B. UPDATE_ROLLBACK_COMPLETE
C. UPDATE_CONIPLETE
D. CREATE_COMPLETE

Correct Answer:A
When a stack is in the UPDATE_ROLLBACK_FA|LED state, you can continue rolling it back to return it to a working state (to UPDATE_ROLLBACK_COMPLETE). You cannot update a stack that is in the UPDATE_ROLLBACK_FA|LED state. However, if you can continue to roll it back, you can return the stack to its original settings and try to update it again.
Reference:
http://docs.aws.amazon.com/AWSCIoudFormation/latest/UserGuide/using-cfn-updating-stacks-continueu pdateroIIback.htmI

Question 18

Your company needs to automate 3 layers of a large cloud deployment. You want to be able to track this depIoyment's evolution as it changes over time, and carefully control any alterations. What is a good way to automate a stack to meet these requirements?

A. Use OpsWorks Stacks with three layers to model the layering in your stack.
B. Use CloudFormation Nested Stack Templates, with three child stacks to represent the three logicallayers of your cloud.
C. Use AWS Config to declare a configuration set that AWS should roll out to your cloud.
D. Use Elastic Beanstalk Linked Applications, passing the important DNS entires between layers using the metadata interface.

Correct Answer:B
Only CIoudFormation allows source controlled, declarative templates as the basis for stack automation. Nested Stacks help achieve clean separation of layers while simultaneously providing a method to control all layers at once when needed.
Reference:
https://bIogs.aws.amazon.com/application-management/post/TxlT9JYOOS8AB9I/Use-Nested-Stacks-to- Create-Reusable-Templates-and-Support-Role-SpeciaIization