DVA-C02 - findprotools.com

dva-c02 Fast Test

Total question: 10 (Login to full test)

Question 1:

The technology team at an investment bank uses DynamoDB to facilitate high-frequency trading where multiple trades can try and update an item at the same time.

Which of the following actions would make sure that only the last updated value of any item is used in the application?

Use ConsistentRead = true while doing PutItem operation for any item

Use ConsistentRead = true while doing UpdateItem operation for any item

Use ConsistentRead = false while doing PutItem operation for any item

Use ConsistentRead = true while doing GetItem operation for any item

Question 2:

A developer working with EC2 Windows instance has installed Kinesis Agent for Windows to stream JSON-formatted log files to Amazon Simple Storage Service (S3) via Amazon Kinesis Data Firehose. The developer wants to understand the sink type capabilities of Kinesis Firehose.

Which of the following sink types is NOT supported by Kinesis Firehose.

Amazon Elasticsearch Service (Amazon ES) with optionally backing up data to Amazon S3

Amazon ElastiCache with Amazon S3 as backup

Amazon Simple Storage Service (Amazon S3) as a direct Firehose destination

Amazon Redshift with Amazon S3

Question 3:

A developer is defining the signers that can create signed URLs for their Amazon CloudFront distributions.

Which of the following statements should the developer consider while defining the signers? (Select two)

When you use the root user to manage CloudFront key pairs, you can only have up to two active CloudFront key pairs per AWS account

When you create a signer, the public key is with CloudFront and private key is used to sign a portion of URL

Both the signers (trusted key groups and CloudFront key pairs) can be managed using the CloudFront APIs

CloudFront key pairs can be created with any account that has administrative permissions and full access to CloudFront resources

You can also use AWS Identity and Access Management (IAM) permissions policies to restrict what the root user can do with CloudFront key pairs

Question 4:

The app development team at a social gaming mobile app wants to simplify the user sign up process for the app. The team is looking for a fully managed scalable solution for user management in anticipation of the rapid growth that the app foresees.

As a Developer Associate, which of the following solutions would you suggest so that it requires the LEAST amount of development effort?

Use Cognito User pools to facilitate sign up and user management for the mobile app

Use Cognito Identity pools to facilitate sign up and user management for the mobile app

Create a custom solution using Lambda and DynamoDB to facilitate sign up and user management for the mobile app

Create a custom solution using EC2 and DynamoDB to facilitate sign up and user management for the mobile app

Question 5:

As a Senior Developer, you are tasked with creating several API Gateway powered APIs along with your team of developers. The developers are working on the API in the development environment, but they find the changes made to the APIs are not reflected when the API is called.

As a Developer Associate, which of the following solutions would you recommend for this use-case?

Enable Lambda authorizer to access API

Redeploy the API to an existing stage or to a new stage

Use Stage Variables for development state of API

Developers need IAM permissions on API execution component of API Gateway

Question 6:

A startup has been experimenting with DynamoDB in its new test environment. The development team has discovered that some of the write operations have been overwriting existing items that have the specified primary key. This has messed up their data, leading to data discrepancies.

Which DynamoDB write option should be selected to prevent this kind of overwriting?

Atomic Counters

Conditional writes

Batch writes

Use Scan operation

Question 7:

What steps can a developer take to optimize the performance of a CPU-bound AWS Lambda function and ensure fast response time?

Increase the function's provisioned concurrency

Increase the function's timeout

Increase the function's CPU

Increase the function's memory

Question 8:

Your company has embraced cloud-native microservices architectures. New applications must be dockerized and stored in a registry service offered by AWS. The architecture should support dynamic port mapping and support multiple tasks from a single service on the same container instance. All services should run on the same EC2 instance.

Which of the following options offers the best-fit solution for the given use-case?

Classic Load Balancer + ECS

Classic Load Balancer + Beanstalk

Application Load Balancer + ECS

Application Load Balancer + Beanstalk

Question 9:

The development team at an e-commerce company completed the last deployment for their application at a reduced capacity because of the deployment policy. The application took a performance hit because of the traffic spike due to an on-going sale.

Which of the following represents the BEST deployment option for the upcoming application version such that it maintains at least the FULL capacity of the application and MINIMAL impact of failed deployment?

Deploy the new application version using 'Immutable' deployment policy

Deploy the new application version using 'Rolling with additional batch' deployment policy

Deploy the new application version using 'Rolling' deployment policy

Deploy the new application version using 'All at once' deployment policy

Question 10:

An application running on EC2 instances processes messages from an SQS queue. However, sometimes the messages are not processed and they end up in errors. These messages need to be isolated for further processing and troubleshooting.

Which of the following options will help achieve this?

Increase the VisibilityTimeout

Reduce the VisibilityTimeout

Use DeleteMessage

Implement a Dead-Letter Queue