Amazon DVA-C01 Online Practice Questions and Exam Preparation

Amazon DVA-C01 Online Questions & Answers

• Question 381:

  A Developer is writing a Linux-based application to run on AWS Elastic Beanstalk. Application requirements state that the application must maintain full capacity during updates while minimizing cost. Which type of Elastic Beanstalk deployment policy should the Developer specify for the environment?

  A. Immutable

  B. Rolling

  C. All at Once

  D. Rolling with additional batch

  Correct Answer: D

  https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.rolling-version-deploy.html

• Question 382:

  A company is running a Docker application on Amazon ECS. The application must scale based on user load in the last 15 seconds. How should a Developer instrument the code so that the requirement can be met?

  A. Create a high-resolution custom Amazon CloudWatch metric for user activity data, then publish data every 30 seconds

  B. Create a high-resolution custom Amazon CloudWatch metric for user activity data, then publish data every 5 seconds

  C. Create a standard-resolution custom Amazon CloudWatch metric for user activity data, then publish data every 30 seconds

  D. Create a standard-resolution custom Amazon CloudWatch metric for user activity data, then publish data every 5 seconds

  Correct Answer: B

  https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/publishingMetrics.html#high- resolution-metrics

• Question 383:

  A Developer wants to use AWS X-Ray to trace a user request end-to-end throughput the software stack. The Developer made the necessary changes in the application tested it, and found that the application is able to send the traces to AWS X-Ray. However, when the application is deployed to an EC2 instance, the traces are not available.

  Which of the following could create this situation? (Select two.)

  A. The traces are reaching X-Ray, but the Developer does not have access to view the records.

  B. The X-Ray daemon is not installed on the EC2 instance.

  C. The X-Ray endpoint specified in the application configuration is incorrect.

  D. The instance role does not have "xray:BatchGetTraces" and "xray:GetTraceGraph" permissions.

  E. The instance role does not have "xray:PutTraceSegments" and "xray:PutTelemetryRecords" permissions.

  Correct Answer: BE

• Question 384:

  A gaming company is developing a mobile game application for iOS?and Android?platforms. This mobile game securely stores user data locally on the device. The company wants to allow users to use multiple device for the game, which requires user data synchronization across device.

  Which service should be used to synchronize user data across devices without the need to create a backend application?

  A. AWS Lambda

  B. Amazon S3

  C. Amazon DynamoDB

  D. Amazon Cognito

  Correct Answer: D

• Question 385:

  Which of the following is an example of a good DynamoDB hash key schema for provisioned throughput efficiency?

  A. User ID, where the application has many different users.

  B. Status Code where most status codes are the same

  C. Device ID, where one is by far more popular than all the others.

  D. Game Type, where there are three possible game types

  Correct Answer: A

• Question 386:

  A supplier is writing a new RESTful API for customers to query the status of orders. The customers requested the following API endpoint.

  http://www.supplierdomain.com/status/customerID

  Which of the following application designs meet the requirements? (Select two.)

  A. Amazon SQS; Amazon SNS

  B. Elastic Load Balancing; Amazon EC2

  C. Amazon ElastiCache; Amazon Elacticsearch Service

  D. Amazon API Gateway; AWS Lambda

  E. Amazon S3; Amazon CloudFront

  Correct Answer: DE

• Question 387:

  An application is using Amazon DynamoDB as its data store, and should be able to read 100 items per second as strongly consistent reads. Each item is 5 KB in size. To what value should the table's provisioned read throughput be set?

  A. 50 read capacity units

  B. 100 read capacity units

  C. 200 read capacity units

  D. 500 read capacity unitsc

  Correct Answer: C

• Question 388:

  A Developer must trigger an AWS Lambda function based on the item lifecycle activity in an Amazon DynamoDB table. How can the Developer create the solution?

  A. Enable a DynamoDB stream that publishes an Amazon SNS message. Trigger the Lambda function synchronously from the SNS message.

  B. Enable a DynamoDB stream that publishes an SNS message. Trigger the Lambda function asynchronously from the SNS message.

  C. Enable a DynamoDB stream, and trigger the Lambda function synchronously from the stream.

  D. Enable a DynamoDB stream, and trigger the Lambda function asynchronously from the stream.

  Correct Answer: C

  https://docs.aws.amazon.com/lambda/latest/dg/with-ddb.html

• Question 389:

  An e-commerce site allows returning users to log in to display customized web pages. The workflow is shown in the image below:

  

  An application is running on EC2 instances. Amazon RDS is used for the database that stores user accounts and preferences. The website freezes or is slow to load while waiting for the login step to complete. The remaining components of the site are well-optimized.

  Which of the following techniques will resolve this issue? (Select Two.)

  A. Implement the user login page as an asynchronous Lambda function.

  B. Use Amazon ElastiCache for MemCached to cache user data.

  C. Use Amazon Application Load Balancer to load balance the traffic to the website.

  D. Call the database asynchronously so the code can continue executing.

  E. Batch login requests from hundreds of users together as a single read request to the database.

  Correct Answer: BD

  https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/making-asynchronous-calls.html

• Question 390:

  When uploading an object, what request header can be explicitly specified in a request to Amazon S3 to encrypt object data when saved on the server side?

  A. x-amz-storage-class

  B. Content-MD5

  C. x-amz-security-token

  D. x-amz-server-side-encryption

  Correct Answer: D

  https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingServerSideEncryption.html#APISupportforServer-SideEncryption