DVA-C02 Online Practice Questions and Answers

A developer is working on an existing application that uses Amazon DynamoDB as its data store. The DynamoDB table has the following attributes: partNumber (partition key), vendor (sort key), description, productFamily, and productType. When the developer analyzes the usage patterns, the developer notices that there are application modules that frequently look for a list of products based on the productFamily and productType attributes.

The developer wants to make changes to the application to improve performance of the query operations.

Which solution will meet these requirements?

A. Create a global secondary index (GSI) with productFamily as the partition key and productType as the sort key.

B. Create a local secondary index (LSI) with productFamily as the partition key and productType as the sort key.

C. Recreate the table. Add partNumber as the partition key and vendor as the sort key. During table creation, add a local secondary index (LSI) with productFamily as the partition key and productType as the sort key.

D. Update the queries to use Scan operations with productFamily as the partition key and productType as the sort key.

A company created four AWS Lambda functions that connect to a relational database server that runs on an Amazon RDS instance. A security team requires the company to automatically change the database password every 30 days. Which solution will meet these requirements MOST securely?

A. Store the database credentials in the environment variables of the Lambda function. Deploy the Lambda function with the new credentials every 30 days.

B. Store the database credentials in AWS Secrets Manager. Configure a 30-day rotation schedule for the credentials.

C. Store the database credentials in AWS Systems Manager Parameter Store secure strings. Configure a 30-day schedule for the secure strings.

D. Store the database credentials in an Amazon S3 bucket that uses server-side encryption with customer-provided encryption keys (SSE-C). Configure a 30-day key rotation schedule for the customer key.

A developer is working on a Python application that runs on Amazon EC2 instances. The developer wants to enable tracing of application requests to debug performance issues in the code.

Which combination of actions should the developer take to achieve this goal? (Choose two.)

A. Install the Amazon CloudWatch agent on the EC2 instances.

B. Install the AWS X-Ray daemon on the EC2 instances.

C. Configure the application to write JSON-formatted logs to /var/log/cloudwatch.

D. Configure the application to write trace data to /var/log/xray.

E. Install and configure the AWS X-Ray SDK for Python in the application.

A development team maintains a web application by using a single AWS RDS, template. The template defines web servers and an Amazon RDS database. The team uses the CloudFormation template to deploy the CloudFormation stack to

different environments.

During a recent application deployment, a developer caused the primary development database to be dropped and recreated. The result of this incident was a loss of data. The team needs to avoid accidental database deletion in the future.

Which solutions will meet these requirements? (Choose two.)

A. Add a CloudFormation DeletionPolicy attribute with the Retain value to the database resource.

B. Update the CloudFormation stack policy to prevent updates to the database.

C. Modify the database to use a Multi-AZ deployment.

D. Create a CloudFormation stack set for the web application and database deployments.

E. Add a CloudFormation DeletionPolicy attribute with the Retain value to the stack.

A company has a web application that is hosted on AWS. The application is behind an Amazon CloudFront distribution. A developer needs a dashboard to monitor error rates and anomalies of the CloudFront distribution as frequently as possible.

Which combination of steps should the developer take to meet these requirements? (Choose two.)

A. Stream the CloudFront distribution logs to an Amazon S3 bucket. Detect anomalies and error rates by using Amazon Athena.

B. Enable real-time logs on the CloudFront distribution. Create a data stream in Amazon Kinesis Data Streams.

C. Set up Amazon Kinesis Data Streams to send the logs to Amazon OpenSearch Service by using an AWS Lambda function. Make a dashboard in OpenSearch Dashboards.

D. Stream the CloudFront distribution logs to Amazon Kinesis Data Firehose.

E. Set up Amazon Kinesis Data Firehose to send the logs to AWS CloudTrail. Create CloudTrail metrics, alarms, and dashboards.

A company requires objects that are stored in Amazon S3 to be encrypted The company is currently using server-side encryption with AWS KMS managed encryption keys (SSE-KMS) A developer needs to optimize the cost-effectiveness of the encryption mechanism without negatively affecting performance

What should the developer do to meet these requirements?

A. Change the encryption type to customer-provided keys.

B. Configure the SJ bucket to use an S3 Bucket Key for SSE-KMS

C. Use S3 bucket policies to limit the principals who can create objects

D. Use a custom policy to limit the number of AWS KMS calls that are allowed

A company has a serverless application that uses an Amazon API Gateway API to invoke an AWS Lambda function. A developer creates a fix for a defect in the Lambda function code. The developer wants to deploy this fix to the production

environment.

To test the changes, the developer needs to send 10% of the live production traffic to the updated Lambda function version.

Which combination of steps will meet these requirements? (Choose two.)

A. Publish a new version of the Lambda function that contains the updated code.

B. Set up a new stage in API Gateway with a new Lambda function version. Enable weighted routing in API Gateway stages.

C. Create an alias for the Lambda function. Configure weighted routing on the alias. Specify a 10% weight for the new Lambda function version.

D. Set up a routing policy on a Network Load Balancer. Configure 10% of the traffic to go to the new Lambda function version.

E. Set up a weighted routing policy by using Amazon Route 53. Configure 10% of the traffic to go to the new Lambda function version.

A developer is creating a database of products. Queries for frequently accessed products must have retrieval times of microseconds. To ensure data consistency, the application cache must be updated whenever products are added, changed, or deleted.

Which solution will meet these requirements?

A. Set up an Amazon DynamoDB database and a DynamoDB Accelerator (DAX) cluster.

B. Set up an Amazon RDS database and an Amazon ElastiCache for Redis cluster. Implement a lazy loading caching strategy with ElastiCache.

C. Setup an Amazon DynamoDB database that has an in-memory cache. Implement a lazy loading caching strategy in the application.

D. Set up an Amazon RDS database and an Amazon DynamoDB Accelerator (DAX) cluster. Specify a TTL setting for the DAX cluster.