Amazon DVA-C01 Online Practice Questions and Exam Preparation

Amazon DVA-C01 Online Questions & Answers

• Question 301:

  A Developer has an application that must accept a large amount of incoming data streams and process the data before sending it to many downstream users. Which serverless solution should the Developer use to meet these requirements?

  A. Amazon RDS MySQL stored procedure with AWS Lambda

  B. AWS Direct Connect with AWS Lambda

  C. Amazon Kinesis Data Streams with AWS Lambda

  D. Amazon EC2 bash script with AWS Lambda

  Correct Answer: C

  Reference: https://aws.amazon.com/kinesis/data-analytics/faqs/

• Question 302:

  A Developer is writing an application that runs on Amazon EC2 instances in an Auto Scaling group. The application data is stored in an Amazon DynamoDB table and records are constantly updated by all instances. An instance sometimes retrieves old data. The Developer wants to correct this by making sure the reads are strongly consistent.

  How can the Developer accomplish this?

  A. Set ConsistentRead to true when calling Getltem.

  B. Create a new DynamoDB Accelerator (DAX) table.

  C. Set Consistency to strong when calling UpdateTable.

  D. Use the GetShardIterator command.

  Correct Answer: A

  Reference: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.ReadConsistency.html

• Question 303:

  The upload of a 15 GB object to Amazon S3 fails. The error message reads: "Your proposed upload exceeds the maximum allowed object size."

  What technique will allow the Developer to upload this object?

  A. Upload the object using the multi-part upload API.

  B. Upload the object over an AWS Direct Connect connection.

  C. Contact AWS Support to increase the object size limit.

  D. Upload the object to another AWS region.

  Correct Answer: A

  https://docs.aws.amazon.com/AmazonS3/latest/dev/UploadingObjects.html

• Question 304:

  A Developer has created an S3 bucket s3://mycoolapp and has enabled server across logging that points to the folder s3://mycoolapp/logs. The Developer moved 100 KB of Cascading Style Sheets (CSS) documents to the folder s3:// mycoolapp/css, and then stopped work. When the developer came back a few days later, the bucket was 50 GB.

  What is the MOST likely cause of this situation?

  A. The CSS files were not compressed and S3 versioning was enabled.

  B. S3 replication was enabled on the bucket.

  C. Logging into the same bucket caused exponential log growth.

  D. An S3 lifecycle policy has moved the entire CSS file to S3 Infrequent Access.

  Correct Answer: C

  Refer AWS documentation - S3 Server logs

  To turn on log delivery, you provide the following logging configuration information: The name of the target bucket where you want Amazon S3 to save the access logs as objects. You can have logs delivered to any bucket that you own that is in the same Region as the source bucket, including the source bucket itself.We recommend that you save access logs in a different bucket so that you can easily manage the logs. If you choose to save access logs in the source bucket, we recommend that you specify a prefix for all log object keys so that the object names begin with a common string and the log objects are easier to identify.When your source bucket and target bucket are the same bucket, additional logs are created for the logs that are written to the bucket. This behavior might not be ideal for your use case because it could result in a small increase in your storage billing. In addition, the extra logs about logs might make it harder to find the log that you're looking for.

• Question 305:

  A Developer must build an application that uses Amazon DynamoDB. The requirements state that items being stored in the DynamoDB table will be 7KB in size and that reads must be strongly consistent. The maximum read rate is 3 items per second, and the maximum write rate is 10 items per second.

  How should the Developer size the DynamoDB table to meet these requirements?

  A. Read: 3 read capacity units Write: 70 write capacity units

  B. Read: 6 read capacity units Write: 70 write capacity units

  C. Read: 6 read capacity units Write: 10 write capacity units

  D. Read: 3 read capacity units Write: 10 write capacity units

  Correct Answer: B

  https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html

• Question 306:

  A Developer created configuration specifications for an AWS Elastic Beanstalk application in a file named healthcheckurl.yaml in the .ebextensions/directory of their application source bundle. The file contains the following: After the application launches, the health check is not being run on the correct path, even though it is valid.

  

  What can be done to correct this configuration file?

  A. Convert the file to JSON format.

  B. Rename the file to a .config extension.

  C. Change the configuration section from options_settings to resources.

  D. Change the namespace of the option settings to a cusom namespace.

  Correct Answer: C

  Reference:

  https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/ebextensions.html You can add AWS Elastic Beanstalk configuration files (.ebextensions) to your web application's source code to configure your environment and customize the AWS

  resources that it contains.

  Configuration files are YAML- or JSON-formatted documents with a .config file extension that you place in a folder named .ebextensions and deploy in your application source bundle.

  https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/ebextensions.html

• Question 307:

  Which of the following is chosen as the default region when making an API call with an AWS SDK?

  A. ap-northeast-1

  B. us-west-2

  C. us-east-1

  D. eu-west-1

  E. us-central-1

  Correct Answer: C

  https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/java-dg-region-selection.html. This section applies only when using a client builder to access AWS services. AWS clients created by using the client constructor will not automatically determine region from the environment and will, instead, use the default SDK region (USEast1).

• Question 308:

  A Developer has written a serverless application using multiple AWS services. The business logic is written as a Lambda function which has dependencies on third-party libraries. The Lambda function endpoints will be exposed using Amazon API Gateway. The Lambda function will write the information to Amazon DynamoDB.

  The Developer is ready to deploy the application but must have the ability to rollback. How can this deployment be automated, based on these requirements?

  A. Deploy using Amazon Lambda API operations to create the Lambda function by providing a deployment package.

  B. Use an AWS CloudFormation template and use CloudFormation syntax to define the Lambda function resource in the template.

  C. Use syntax conforming to the Serverless Application Model in the AWS CloudFormation template to define the Lambda function resource.

  D. Create a bash script which uses AWS CLI to package and deploy the application.

  Correct Answer: C

  Refer AWS documentation - SAM Gradual Code Deployment

  If you use AWS SAM to create your serverless application, it comes built-in with AWS CodeDeploy to help

  Deploys new versions of your Lambda function, and automatically creates aliases that point to the new version.

  Gradually shifts customer traffic to the new version until you're satisfied that it's working as expected, or you roll back the update. Defines pre-traffic and post-traffic test functions to verify that the newly deployed code is configured correctly

  and your application operates as expected.

  Rolls back the deployment if CloudWatch alarms are triggered.

• Question 309:

  A Developer has a stateful web server on-premises that is being migrated to AWS. The Developer must have greater elasticity in the new design. How should the Developer re-factor the application to make it more elastic? (Choose two.)

  A. Use pessimistic concurrency on Amazon DynamoDB

  B. Use Amazon CloudFront with an Auto Scaling group

  C. Use Amazon CloudFront with an AWS Web Application Firewall

  D. Store session state data in an Amazon DynamoDB table

  E. Use an ELB with an Auto Scaling group

  Correct Answer: DE

• Question 310:

  An application running on EC2 instances is storing data in an S3 bucket. Security policy mandates that all data must be encrypted in transit. How can the Developer ensure that all traffic to the S3 bucket is encrypted?

  A. Install certificates on the EC2 instances.

  B. Create a bucket policy that allows traffic where SecureTransport is true.

  C. Create an HTTPS redirect on the EC2 instances.

  D. Create a bucket policy that denies traffic where SecureTransport is false.

  Correct Answer: D

  https://aws.amazon.com/blogs/security/how-to-use-bucket-policies-and-apply-defense-in-depth-to-help-secure-your-amazon-s3-data/