Amazon DVA-C02 Online Practice Questions and Exam Preparation

Amazon DVA-C02 Online Questions & Answers

• Question 411:

  A developer is writing an AWS Lambda function. The developer wants to log key events that occur while the Lambda function runs. The developer wants to include a unique identifier to associate the events with a specific function invocation. The developer adds the following code to the Lambda function:

  

  Which solution will meet this requirement?

  A. Obtain the request identifier from the AWS request ID field in the context object. Configure the application to write logs to standard output.
  B. Obtain the request identifier from the AWS request ID field in the event object. Configure the application to write logs to a file.
  C. Obtain the request identifier from the AWS request ID field in the event object. Configure the application to write logs to standard output.
  D. Obtain the request identifier from the AWS request ID field in the context object. Configure the application to write logs to a file.
  A. Obtain the request identifier from the AWS request ID field in the context object. Configure the application to write logs to standard output.

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  Explanation

• Question 412:

  A developer is creating a database of products. Queries for frequently accessed products must have retrieval times of microseconds. To ensure data consistency, the application cache must be updated whenever products are added, changed, or deleted.

  Which solution will meet these requirements?

  A. Set up an Amazon DynamoDB database and a DynamoDB Accelerator (DAX) cluster.
  B. Set up an Amazon RDS database and an Amazon ElastiCache for Redis cluster. Implement a lazy loading caching strategy with ElastiCache.
  C. Setup an Amazon DynamoDB database that has an in-memory cache. Implement a lazy loading caching strategy in the application.
  D. Set up an Amazon RDS database and an Amazon DynamoDB Accelerator (DAX) cluster. Specify a TTL setting for the DAX cluster.
  A. Set up an Amazon DynamoDB database and a DynamoDB Accelerator (DAX) cluster.

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  Explanation

• Question 413:

  A developer is building an application that gives users the ability to view bank accounts from multiple sources in a single dashboard. The developer has automated the process to retrieve API credentials for these sources. The process invokes an AWS Lambda function that is associated with an AWS CloudFormation custom resource.

  The developer wants a solution that will store the API credentials with minimal operational overhead.

  Which solution will meet these requirements in the MOST secure way?

  A. Add an AWS Secrets Manager GenerateSecretString resource to the CloudFormation template. Set the value to reference new credentials for the CloudFormation resource.
  B. Use the AWS SDK ssm:PutParameter operation in the Lambda function from the existing custom resource to store the credentials as a parameter. Set the parameter value to reference the new credentials. Set the parameter type to SecureString.
  C. Add an AWS Systems Manager Parameter Store resource to the CloudFormation template. Set the CloudFormation resource value to reference the new credentials. Set the resource NoEcho attribute to true.
  D. Use the AWS SDK ssm:PutParameter operation in the Lambda function from the existing custom resource to store the credentials as a parameter. Set the parameter value to reference the new credentials. Set the parameter NoEcho attribute to true.
  B. Use the AWS SDK ssm:PutParameter operation in the Lambda function from the existing custom resource to store the credentials as a parameter. Set the parameter value to reference the new credentials. Set the parameter type to SecureString.

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  Explanation

• Question 414:

  A developer needs to manage AWS infrastructure as code and must be able to deploy multiple identical copies of the infrastructure, stage changes, and revert to previous versions.

  Which approach addresses these requirements?

  A. Use cost allocation reports and AWS OpsWorks to deploy and manage the infrastructure.
  B. Use Amazon CloudWatch metrics and alerts along with resource tagging to deploy and manage the infrastructure.
  C. Use AWS Elastic Beanstalk and AWS CodeCommit to deploy and manage the infrastructure.
  D. Use AWS CloudFormation and AWS CodeCommit to deploy and manage the infrastructure.
  D. Use AWS CloudFormation and AWS CodeCommit to deploy and manage the infrastructure.

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  Explanation

• Question 415:

  A developer is working on an ecommerce website. The developer wants to review server logs without logging in to each of the application servers individually. The website runs on multiple Amazon EC2 instances, is written in Python, and needs to be highly available.

  How can the developer update the application to meet these requirements with MINIMUM changes?

  A. Rewrite the application to be cloud native and to run on AWS Lambda, where the logs can be reviewed in Amazon CloudWatch.
  B. Set up centralized logging by using Amazon OpenSearch Service, Logstash, and OpenSearch Dashboards.
  C. Scale down the application to one larger EC2 instance where only one instance is recording logs.
  D. Install the unified Amazon CloudWatch agent on the EC2 instances. Configure the agent to push the application logs to CloudWatch.
  D. Install the unified Amazon CloudWatch agent on the EC2 instances. Configure the agent to push the application logs to CloudWatch.

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  Explanation

• Question 416:

  A developer is creating an AWS Lambda function that consumes messages from an Amazon Simple Queue Service (Amazon SQS) standard queue. The developer notices that the Lambda function processes some messages multiple times.

  How should developer resolve this issue MOST cost-effectively?

  A. Change the Amazon SQS standard queue to an Amazon SQS FIFO queue by using the Amazon SQS message deduplication ID.
  B. Set up a dead-letter queue.
  C. Set the maximum concurrency limit of the AWS Lambda function to 1
  D. Change the message processing to use Amazon Kinesis Data Streams instead of Amazon SQS.
  A. Change the Amazon SQS standard queue to an Amazon SQS FIFO queue by using the Amazon SQS message deduplication ID.

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  Explanation

  Amazon Simple Queue Service (Amazon SQS) is a fully managed queue service that allows you to de-couple and scale for applications1. Amazon SQS offers two types of queues: Standard and FIFO (First In First Out) queues1. The FIFO queue uses the messageDeduplicationId property to treat messages with the same value as duplicate2. Therefore, changing the Amazon SQS standard queue to an Amazon SQS FIFO queue using the Amazon SQS message deduplication ID can help resolve the issue of the Lambda function processing some messages multiple times. Therefore, option A is correct.

• Question 417:

  An AWS Lambda function requires read access to an Amazon S3 bucket and requires read/write access to an Amazon DynamoDB table. The correct IAM policy already exists.

  What is the MOST secure way to grant the Lambda function access to the S3 bucket and the DynamoDB table?

  A. Attach the existing IAM policy to the Lambda function.
  B. Create an IAM role for the Lambda function. Attach the existing IAM policy to the role. Attach the role to the Lambda function.
  C. Create an IAM user with programmatic access. Attach the existing IAM policy to the user. Add the user access key ID and secret access key as environment variables in the Lambda function.
  D. Add the AWS account root user access key ID and secret access key as encrypted environment variables in the Lambda function.
  B. Create an IAM role for the Lambda function. Attach the existing IAM policy to the role. Attach the role to the Lambda function.

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  Explanation

• Question 418:

  A developer is creating an AWS Lambda function that searches for items from an Amazon DynamoDB table that contains customer contact information. The DynamoDB table items have the customer's email_address as the partition key and additional properties such as customer_type, name and job_title.

  The Lambda function runs whenever a user types a new character into the customer_type text input. The developer wants the search to return partial matches of all the email_address property of a particular customer_type. The developer does not want to recreate the DynamoDB table.

  What should the developer do to meet these requirements?

  A. Add a global secondary index (GSI) to the DynamoDB table with customer_type as the partition key and email_address as the sort key. Perform a query operation on the GSI by using the begins_with key condition expression with the email_address property.
  B. Add a global secondary index (GSI) to the DynamoDB table with email_address as the partition key and customer_type as the sort key. Perform a query operation on the GSI by using the begins_with key condition expression with the email_address property.
  C. Add a local secondary index (LSI) to the DynamoDB table with customer_type as the partition key and email_address as the sort key. Perform a query operation on the LSI by using the begins_with key condition expression with the email_address property.
  D. Add a local secondary index (LSI) to the DynamoDB table with job_title as the partition key and email_address as the sort key. Perform a query operation on the LSI by using the begins_with key condition expression with the email_address property.
  A. Add a global secondary index (GSI) to the DynamoDB table with customer_type as the partition key and email_address as the sort key. Perform a query operation on the GSI by using the begins_with key condition expression with the email_address property.

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  Explanation

• Question 419:

  A developer registered an AWS Lambda function as a target for an Application Load Balancer (ALB) using a CLI command. However, the Lambda function is not being invoked when the client sends requests through the ALB.

  Why is the Lambda function not being invoked?

  A. A Lambda function cannot be registered as a target for an ALB.
  B. A Lambda function can be registered with an ALB using AWS Management Console only.
  C. The permissions to invoke the Lambda function are missing.
  D. Cross-zone is not enabled on the ALB.
  C. The permissions to invoke the Lambda function are missing.

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  Explanation

• Question 420:

  A developer is designing an event-driven architecture. An AWS Lambda function that processes data needs to push processed data to a subset of four consumer Lambda functions. The data must be routed based on the value of one field in the data.

  Which solution will meet these requirements with the least operational overhead?

  A. Create an Amazon Simple Queue Service (Amazon SQS) queue and event source mapping for each consumer Lambda function. Add message routing logic to the data-processing Lambda function.
  B. Create an Amazon Simple Notification Service (Amazon SNS) topic. Subscribe the four consumer Lambda functions to the topic. Add message filtering logic to each consumer Lambda function. Subscribe the data-processing Lambda function to the SNS topic.
  C. Create a separate Amazon Simple Notification Service (Amazon SNS) topic and subscription for each consumer Lambda function. Add message routing logic to the data-processing Lambda function to publish to the appropriate topic.
  D. Create a single Amazon Simple Notification Service (Amazon SNS) topic. Subscribe the four consumer Lambda functions to the topic. Add SNS subscription filter policies to each subscription. Configure the data-processing Lambda function to publish to the topic.
  B. Create an Amazon Simple Notification Service (Amazon SNS) topic. Subscribe the four consumer Lambda functions to the topic. Add message filtering logic to each consumer Lambda function. Subscribe the data-processing Lambda function to the SNS topic.

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  Explanation