Amazon DVA-C01 Online Practice Questions and Exam Preparation

Amazon DVA-C01 Online Questions & Answers

• Question 131:

  A developer is building a website that will be hosted in an Amazon S3 bucket with static website hosting enabled. The developer will use Amazon Route 53 for the DNS service and will use an alias record to point the company's domain to the bucket. The developer must redirect one S3 object to a different URL.

  What should the developer use so that the redirect will work correctly from a page on the website?

  A. A Route 53 CNAME alias record that points to the new location

  B. An S3 object-level redirect through system-defined metadata

  C. A Route 53 A record that points to the new location

  D. A redirect that is configured within the S3 bucket's policy

  Correct Answer: A

  Reference: https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/RoutingToS3Bucket.html

• Question 132:

  A company has an Amazon S3 bucket containing premier content that it intends to make available to only paid subscribers of its website. The S3 bucket currently has default permissions of all objects being private to prevent inadvertent exposure of the premier content to non-paying website visitors.

  How can the company limit the ability to download a premier content file in the S3 bucket to paid subscribers only?

  A. Apply a bucket policy that allows anonymous users to download the content from the S3 bucket.

  B. Generate a pre-signed object URL for the premier content file when a paid subscriber requests a download.

  C. Add a bucket policy that requires multi-factor authentication for requests to access the S3 bucket objects.

  D. Enable server-side encryption on the S3 bucket for data protection against the non-paying website visitors.

  Correct Answer: B

• Question 133:

  A company is planning to deploy an application on AWS behind an Elastic Load Balancer. The application uses an HTTP/HTTPS listener and must access the client IP addresses.

  Which load-balancing solution meets these requirements?

  A. Use an Application Load Balancer and the X-Forwarded-For headers.

  B. Use a Network Load Balancer (NLB). Enable proxy protocol support on the NLB and the target application.

  C. Use an Application Load Balancer. Register the targets by the instance ID.

  D. Use a Network Load Balancer and the X-Forwarded-For headers.

  Correct Answer: A

  Reference: https://aws.amazon.com/premiumsupport/knowledge-center/elb-capture-client-ip-addresses/

• Question 134:

  An AWS Lambda function accesses two Amazon DynamoDB tables. A developer wants to improve the performance of the Lambda function by identifying bottlenecks in the function. How can the developer inspect the timing of the DynamoDB API calls?

  A. Add DynamoDB as an event source to the Lambda function. View the performance with Amazon CloudWatch metrics.

  B. Place an Application Load Balancer (ALB) in front of the two DynamoDB tables. Inspect the ALB logs.

  C. Limit Lambda to no more than five concurrent invocations. Monitor from the Lambda console.

  D. Enable AWS X-Ray tracing for the function. View the traces from the X-Ray service.

  Correct Answer: D

  Reference: https://docs.aws.amazon.com/lambda/latest/dg/services-xray.html

• Question 135:

  A company wants to make sure that only one user from its Admin group has the permanent right to delete an Amazon EC2 resource. There should be no changes in the existing policy under the Admin group. What should a developer use to meet these requirements?

  A. AWS managed policy

  B. Inline policy

  C. IAM trust relationship

  D. AWS Security Token Service (AWS STS)

  Correct Answer: A

  Reference: https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html

• Question 136:

  A developer is creating AWS CloudFormation templates to manage an application's deployment in Amazon Elastic Container Service (Amazon ECS) through AWS CodeDeploy. The developer wants to automatically deploy new versions of the application to a percentage of users before the new version becomes available for all users.

  How should the developer manage the deployment of the new version?

  A. Modify the CloudFormation template to include a Transform section and the AWS::CodeDeploy::BlueGreen hook.

  B. Deploy the new version in a new CloudFormation stack. After testing is complete, update the application's DNS records for the new stack.

  C. Run CloudFormation stack updates on the application stack to deploy new application versions when they are available.

  D. Create a nested stack for the new version. Include a Transform section and the AWS::CodeDeploy::BlueGreen hook.

  Correct Answer: A

  Reference: https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-cloudformation-templates.html

• Question 137:

  A developer is creating a serverless ecommerce application that is based on AWS Lambda. An asynchronous workflow manages the checkout process and must orchestrate different Lambda functions. The workflow runs one function for

  each item in the shopping cart. The developer is using AWS Step Functions to orchestrate the process.

  The checkout process is running the Lambda functions serially, and the developer needs to improve the performance of the process.

  What should the developer do to meet these requirements?

  A. Use a Choice state to identify the size of the cart and invoke a specific Lambda function with the entire cart content.

  B. Use a Retry field for a second run to process all the items that failed.

  C. Use a Parallel state to iterate over all the items in parallel.

  D. Use a Map state to iterate over all the items in the cart.

  Correct Answer: D

• Question 138:

  A company uses a third-party tool to build, bundle, and package its applications on-premises, and store them locally. The company uses Amazon EC2 instances to run its front-end applications. How can an application be deployed from the source control system onto the EC2 instances?

  A. Use AWS CodeDeploy and point it to the local storage to directly deploy a bundle in a .zip, .tar, or .tar.gz format.

  B. Upload the bundle to an Amazon S3 bucket and specify the S3 location when doing a deployment using AWS CodeDeploy.

  C. Create a repository using AWS CodeCommit to automatically trigger a deployment to the EC2 instances.

  D. Use AWS CodeBuild to automatically deploy the latest build to the latest EC2 instances.

  Correct Answer: A

  Reference: https://aws.amazon.com/codedeploy/faqs/

• Question 139:

  An application is processing clickstream data using Amazon Kinesis. The clickstream data feed into Kinesis experiences periodic spikes. The PutRecords API call occasionally fails and the logs show that the failed call returns the response shown below:

  

  Which techniques will help mitigate this exception? (Choose two.)

  A. Implement retries with exponential backoff.

  B. Use a PutRecord API instead of PutRecords.

  C. Reduce the frequency and/or size of the requests.

  D. Use Amazon SNS instead of Kinesis.

  E. Reduce the number of KCL consumers.

  Correct Answer: BC

• Question 140:

  A developer has created a Node.js web application on a local development machine. The developer wants to use AWS technology to host the website. The developer needs a solution that requires the least possible operational overhead and no code changes.

  Which AWS service should the developer use to meet these requirements?

  A. AWS Elastic Beanstalk

  B. Amazon EC2

  C. AWS Lambda

  D. Amazon Elastic Kubernetes Service (Amazon EKS)

  Correct Answer: A

  Reference: https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/nodejs-devenv.html