Latest Amazon AWS-Certified-Developer-Associate Actual Free Exam Questions & Community Discussion, Page 3

Question #17

A company uses Amazon DynamoDB as a data store for its order management system. The company frontend application stores orders in a DynamoDB table. The DynamoDB table is configured to send change events to a DynamoDB stream. The company uses an AWS Lambda function to log and process the incoming orders based on data from the DynamoDB stream.
An operational review reveals that the order quantity of incoming orders is sometimes set to 0. A developer needs to create a dashboard that will show how many unique customers this problem affects each day.
What should the developer do to implement the dashboard?

A. Use Amazon Athena to query AWS CtoudTrail API logs for API calls. Implement an Athena query that selects the number of unique customers for orders with order quantity equal to 0 and groups the results in 1-day periods. Add the Athena query to an Amazon CloudWatch dashboard.

B. Turn on custom Amazon CloudWatch metrics for the DynamoDB stream of the DynamoOB table.Create a CloudWatch alarm that groups the number of unique customers for orders with order quantity equal to 0 in 1-day periods. Add the CloudWatch alarm to a CloudWatch dashboard.

C. Grant the Lambda function's execution role permissions to upload logs to Amazon CloudWatch Logs.
Implement a CloudWatch Logs Insights query that selects the number of unique customers for orders with order quantity equal to 0 and groups the results in 1-day periods. Add the CloudWatch Logs Insights query to a CloudWatch dashboard.

D. Configure the Lambda function to send events to Amazon EventBridge. Create an EventBridge rule that groups the number of unique customers for orders with order quantity equal to 0 in 1-day periods. Add a CloudWatch dashboard as the target of the rule.

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Correct Answer: C Vote an answer

Question #18

A developer runs an application that displays scores for sports games on Amazon EC2 instances. The application uses a Redis client to retrieve the scores from an Amazon ElastiCache (Redis OSS) cluster.
The developer observes increased latency during operations on the cache because of connection failures to the cluster. The developer needs to resolve the latency issues.

A. Deploy more nodes in the ElastiCache cluster. Update the Redis client to discover the new nodes.

B. Store the scores in the application's memory. Perform bulk set operations on the scores that are stored in memory.

C. Configure the Redis client in the application to persist connections to the cluster by implementing a connection pool.

D. Configure the Redis client to use an exponential backoff retry strategy to establish cache connections.

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Correct Answer: C Vote an answer

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Question #19

A developer has observed an increase in bugs in the AWS Lambda functions that a development team has deployed in its Node.js application.
To minimize these bugs, the developer wants to implement automated testing of Lambda functions in an environment that closely simulates the Lambda environment.
The developer needs to give other developers the ability to run the tests locally. The developer also needs to integrate the tests into the team's continuous integration and continuous delivery (CI/CD) pipeline before the AWS Cloud Development Kit (AWS CDK) deployment.
Which solution will meet these requirements?

A. Create sample events based on the Lambda documentation. Create automated test scripts that use the cdk local invoke command to invoke the Lambda functions. Check the response. Document the test scripts for the other developers on the team. Update the CI/CD pipeline to run the test scripts.

B. Install a unit testing framework that reproduces the Lambda execution environment. Create sample events based on the Lambda documentation. Invoke the handler function by using a unit testing framework. Check the response. Document how to run the unit testing framework for the other developers on the team. Update the CI/CD pipeline to run the unit testing framework.

C. Install the AWS Serverless Application Model (AWS SAM) CLI tool. Use the sam local generate-event command to generate sample events for the automated tests. Create automated test scripts that use the sam local invoke command to invoke the Lambda functions. Check the response. Document the test scripts for the other developers on the team. Update the CI/CD pipeline to run the test scripts.

D. Create sample events based on the Lambda documentation. Create a Docker container from the Node.js base image to invoke the Lambda functions. Check the response. Document how to run the Docker container for the other developers on the team. Update the CllCD pipeline to run the Docker container.

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Correct Answer: C Vote an answer

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Question #20

A developer is creating an application that uses an Amazon DynamoDB table. The developer needs to develop code that reads all records that were added to the table during the previous day. creates HTML reports, and pushes the reports into third-party storage. The item size varies from 1 KB to 4 KB, and the index structure is defined with the date. The developer needs to minimize the read capacity that the application requires from the DynamoDB table.
Which DynamoDB API operation should the developer use in the code to meet these requirements?

A. BatchGetltem

B. Query

C. Scan

D. Getltem

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Correct Answer: B Vote an answer

Question #21

A developer is creating an AWS Serverless Application Model (AWS SAM) template. The AWS SAM template contains the definition of multiple AWS Lambda functions, an Amazon S3 bucket, and an Amazon CtoudFront distribution. One of the Lambda functions runs on Lambda@Edge in the CloudFront distribution.
The S3 bucket is configured as an origin for the CloudFront distribution.
When the developer deploys the AWS SAM template in the eu-west-1 Region, the creation of the stack fails.
Which of the following could be the reason for this issue?

A. CloudFront distributions can be created only in the us-east-1 Region.

B. A single AWS SAM template cannot contain multiple Lambda functions.

C. The CloudFront distribution and the S3 bucket cannot be created in the same Region.

D. Lambda@Edge functions can be created only in the us-east-1 Region.

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Correct Answer: D Vote an answer

Question #22

A developer is building an application that includes an AWS Lambda function that is written in .NET Core.
The Lambda function's code needs to interact with Amazon DynamoDB tables and Amazon S3 buckets. The developer must minimize the Lambda function's deployment time and invocation duration.
Which solution will meet these requirements?

A. Increase the Lambda function's memory.

B. Include the entire AWS SDK for .NET in the Lambda function's deployment package.

C. Include only the AWS SDK for .NET modules for DynamoDB and Amazon S3 in the Lambda function's deployment package.

D. Configure the Lambda function to download the AWS SDK for .NET from an S3 bucket at runtime.

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Correct Answer: C Vote an answer

Question #23

A company uses Amazon API Gateway to expose a set of APIs to customers. The APIs have caching enabled in API Gateway. Customers need a way to invalidate the cache for each API when they test the API.
What should a developer do to give customers the ability to invalidate the API cache?

A. Attach an InvalidateCache policy to the IAM execution role that the customers use to invoke the API.Ask the customers to add the INVALIDATE_CACHE query string parameter when they make an API call.

B. Ask the customers to use the AWS SDK API Gateway class to invoke the InvalidateCache API operation.

C. Attach an InvalidateCache policy to the IAM execution role that the customers use to invoke the API.
Ask the customers to send a request that contains the HTTP header when they make an API call.

D. Ask the customers to use AWS credentials to call the InvalidateCache API operation.

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Correct Answer: A Vote an answer

Question #24

A company had an Amazon RDS for MySQL DB instance that was named mysql-db. The DB instance was deleted within the past 90 days. A developer needs to find which 1AM user or role deleted the DB instance in the AWS environment. Which solution will provide this information?

A. Retrieve the AWS CloudTrail events for the resource mysql-db where the event name is DeleteDBInstance. Inspect each event.

B. Retrieve the Amazon CloudWatch log events from the most recent log stream within the rds/mysql-db log group. Inspect the log events.

C. Retrieve the AWS Systems Manager deletions inventory Filter the inventory by deletions that have a TypeName value of RDS. Inspect the deletion details.

D. Retrieve the AWS X-Ray trace summaries. Filter by services with the name mysql-db. Inspect the ErrorRootCauses values within each summary.

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Correct Answer: A Vote an answer

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