Question 1

A developer is working on a web application that uses Amazon DynamoDB as its data store The application has two DynamoDB tables one table that is named artists and one table that is named songs The artists table has artistName as the partition key. The songs table has songName as the partition key and artistName as the sort key The table usage patterns include the retrieval of multiple songs and artists in a single database operation from the webpage. The developer needs a way to retrieve this information with minimal network traffic and optimal application performance. Which solution will meet these requirements'?

Options :

A : Perform a BatchGetltem operation that returns items from the two tables. Use the list of songName/artistName keys for the songs table and the list of artistName key for the artists table.

B : Create a local secondary index (LSI) on the songs table that uses artistName as the partition key. Perform a query operation for each artistName on the songs table that filters by the list of songName. Perform a query operation for each artistName on the artists table.

C : Perform a BatchGetitem operation on the songs table that uses the songName/artistName keys. Perform a BatchGetltem operation on the artists table that uses artistName as the key.

D : Perform a Scan operation on each table that filters by the list of songName/artistName for the songs table and the list of artistName in the artists table.

Answer: A

Question 2

A developer needs to deploy an application running on AWS Fargate using Amazon ECS The application has environment variables that must be passed to a container for the application to initialize. How should the environment variables be passed to the container?

Options :

A : Define an array that includes the environment variables under the environment parameter within the service definition.

B : Define an array that includes the environment variables under the environment parameter within the task definition.

C : Define an array that includes the environment variables under the entryPoint parameter within the task definition.

D : Define an array that includes the environment variables under the entryPoint parameter within the service definition.

Answer: B

Question 3

A Developer manages a monitoring service for a fleet of IoT sensors in a major city. The monitoring application uses an Amazon Kinesis Data Stream with a group of EC2 instances processing the data. Amazon CloudWatch custom metrics show that the instances a reaching maximum processing capacity and there are insufficient shards in the Data Stream to handle the rate of data flow.

What course of action should the Developer take to resolve the performance issues?

Options :

A : Increase the EC2 instance size and add shards to the stream

B : Increase the number of open shards

C : Increase the number of EC2 instances to match the number of shards

D : Increase the EC2 instance size

Answer: A

Question 4

A developer has an application that makes batch requests directly to Amazon DynamoDB by using the BatchGetItem low-level API operation. The responses frequently return values in the UnprocessedKeys element.

Which actions should the developer take to increase the resiliency of the application when the batch response includes values in UnprocessedKeys? (Choose two.)

Options :

A : Retry the batch operation immediately.

B : Retry the batch operation with exponential backoff and randomized delay.

C : Update the application to use an AWS software development kit (AWS SDK) to make the requests.

D : Increase the provisioned read capacity of the DynamoDB tables that the operation accesses.

E : Increase the provisioned write capacity of the DynamoDB tables that the operation accesses.

Answer: B,D

Question 5

A company is building an application on AWS. The application's backend includes an Amazon API Gateway REST API. The company's frontend application developers cannot continue work until the backend API is ready for integration. The company needs a solution that will allow the frontend application developers to continue their work.

Which solution will meet these requirements in the MOST operationally efficient way?

Options :

A : Configure mock integrations for API Gateway API methods.

B : Integrate a Lambda function with API Gateway and return a mocked response.

C : Add new API endpoints to the API Gateway stage and returns a mocked response.

D : Configure a proxy resource for API Gateway API methods.

Answer: D

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