DVA-C01 Online Practice Questions and Answers

An application uses AWS X-Ray to generate a large amount of trace data on an hourly basis. A developer wants to use filter expressions to limit the returned results through user-specified custom attributes. How should the developer use filter expressions to filter the results in X-Ray?

A. Add custom attributes as annotations in the segment document.

B. Add custom attributes as metadata in the segment document.

C. Add custom attributes as new segment fields in the segment document.

D. Create new sampling rules that are based on custom attributes.

A Lambda function is packaged for deployment to multiple environments, including development, test, production, etc. Each environment has unique set of resources such as databases, etc.

How can the Lambda function use the resources for the current environment?

A. Apply tags to the Lambda functions.

B. Hardcore resources in the source code.

C. Use environment variables for the Lambda functions.

D. Use separate function for development and production.

An on-premises application is implemented using a Linux, Apache, MySQL and PHP (LAMP) stack. The Developer wants to run this application in AWS.

Which of the following sets of AWS services can be used to run this stack?

A. Amazon API Gateway, Amazon S3

B. AWS Lambda, Amazon DynamoDB

C. Amazon EC2, Amazon Aurora

D. Amazon Cognito, Amazon RDS

E. Amazon ECS, Amazon EBS

You are providing AWS consulting services for a company developing a new mobile application that will be leveraging Amazon SNS Mobile Push for push notifications. In order to send direct notification messages to individual devices each device registration identifier or token needs to be registered with SNS; however the developers are not sure of the best way to do this.

You advise them to:

A. Bulk upload the device tokens contained in a CSV file via the AWS Management Console.

B. Let the push notification service (e.g. Amazon Device Messaging) handle the registration.

C. Implement a token vending service to handle the registration.

D. Call the CreatePlatformEndPoint API function to register multiple device tokens.

A Developer needs to deploy an application running on AWS Fargate using Amazon ECS. The application has environment variables that must be passed to a container tor the application to initialize How should the environment variables be passed to the container?

A. Define an array that includes the environment variables under the environment parameter within the service definition

B. Define an array that includes the environment variables under the environment parameter within the task definition

C. Define an array that includes the environment variables under the entrypoint parameter within the task definition

D. Define in array that includes the environment variables under the entryPoint parameter within the service definition

A company needs to encrypt data at rest, but it wants to leverage an AWS managed service using its own master key. Which of the following AWS service can be used to meet these requirements?

A. SSE with Amazon S3

B. SSE with AWS KMS

C. Client-side encryption

D. AWS IAM roles and policies

A global company has an application running on Amazon EC2 instances that serves image files from Amazon S3. User requests from the browser are causing high traffic, which results in degraded performance. Which optimization solution should a Developer implement to increase application performance?

A. Create multiple prefix in the S3 bucket to increase the request rate

B. Create an Amazon ElastiCache cluster to cache and serve frequently accessed items.

C. Use Amazon CloudFront to serve the content of images stored in Amazon S3.

D. Submit a ticket to AWS support to request a rate limit increase for the S3 bucket.

A company is running an application built on AWS Lambda functions. One Lambda function has performance multiple times a second. What solution would give the BEST performance increase?

A. Cache the file in the /tmp directory

B. Increase the Lambda maximum execution time

C. Put an Elastic Load Balancer in front of the Lambda function

D. Cache the file in Amazon S3

A developer has designed a customer-facing application that is running on an Amazon EC2 instance. The application logs every request made to it. The application usually runs seamlessly, but a spike in traffic generates several logs that cause the disk to fill up and eventually run out of memory. Company policy requires old logs to be centralized for analysis.

Which long-term solution should the developer employ to prevent the issue from reoccurring?

A. Set up log rotation to rotate the file every day. Also set up log rotation to rotate after every 100 MB and compress the file.

B. Install the Amazon CloudWatch agent on the instance to send the logs to CloudWatch. Delete the logs from the instance once they are sent to CloudWatch.

C. Enable AWS Auto Scaling on Amazon Elastic Block Store (Amazon EBS) to automatically add volumes to the instance when it reaches a specified threshold.

D. Create an Amazon EventBridge (Amazon CloudWatch Events) rule to pull the logs from the instance. Configure the rule to delete the logs after they have been pulled.

A company is launching a new web application in the AWS Cloud. The company's development team is using AWS Elastic Beanstalk for deployment and maintenance. According to the company's change management process, the development team must evaluate changes for a specific time period before completing the rollout.

Which deployment policy meets this requirement?

A. Immutable

B. Rolling

C. Rolling with additional batch

D. Traffic splitting