AWS Certified Developer - Associate Certification Sample Questions and Practice Exam

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The DVA-C02 Exam is an associate-level certification, which means that candidates should have a good understanding of AWS services and be able to demonstrate their knowledge of AWS best practices. DVA-C02 exam covers a wide range of topics, including AWS core services, security, and deployment. It also covers topics such as how to design and develop scalable AWS applications, how to troubleshoot issues, and how to optimize application performance.

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Amazon DVA-C02 (AWS Certified Developer - Associate) Certification Exam is an exam designed for professionals who want to demonstrate their expertise in developing and maintaining applications on the Amazon Web Services (AWS) platform. AWS Certified Developer - Associate certification exam is ideal for developers who are experienced in AWS technologies and are looking to validate their skills and knowledge by obtaining a globally recognized certification.

Amazon DVA-C02 (AWS Certified Developer - Associate) exam is a certification exam designed for developers who work with Amazon Web Services (AWS). DVA-C02 exam validates a developer's ability to design, develop, and deploy cloud-based solutions using AWS services. It is intended for individuals who have experience in developing and maintaining AWS-based applications.

Amazon AWS Certified Developer - Associate Sample Questions (Q190-Q195):

NEW QUESTION # 190
A developer owns and supports an application that has database credentials that are stored in environment variables for AWS Lambda functions. The developer needs an alternate storage method for the credentials instead of environment variables in plaintext. Which solution will handle the credentials MOST securely?

A. Store the database credentials as a secret in AWS Secrets Manager. Set the secret ' s Amazon Resource Name (ARN) as the value of an environment variable. Use the AWS Parameters and Secrets Lambda Extension to retrieve the credentials in the Lambda function.
B. Store the database credentials as a string type parameter in the AWS Systems Manager Parameter Store.
Set the parameter ' s Amazon Resource Name (ARN) as the value of an environment variable. Use the AWS Parameters and Secrets Lambda Extension to retrieve the credentials from the Lambda function.
C. Use base64 encoding for the database credentials. Include the database credentials into the Lambda function ' s source code as part of a build process. Update the Lambda function ' s code to decode the credentials before the credentials are used.
D. Use AWS CloudFormation to deploy the application. Ensure that the NoEcho property is set to true for the parameters that contain the database credentials.

Answer: A

Explanation:
AWS Secrets Manager is specifically designed for sensitive information like database credentials. It supports automatic rotation and cross-account access. Using the " AWS Parameters and Secrets Lambda Extension " is the modern, high-performance way to retrieve secrets. It caches the secret locally in the Lambda execution environment, reducing latency and cost (API call volume) while ensuring the credentials are not stored in plaintext in environment variables or source code.

NEW QUESTION # 191
A company uses an AWS Lambda function to transfer files from an Amazon S3 bucket to the company's SFTP server. The Lambda function connects to the SFTP server by using credentials such as username and password. The company uses Lambda environment variables to store these credentials.
A developer needs to implement encrypted username and password credentials.
Which solution will meet these requirements?

A. Remove the user credentials from the Lambda environment. Implement 1AM database authentication.
B. Move the user credentials from Lambda environment variables to AWS Key Management Service (AWS KMS).
C. Move the user credentials from Lambda environment variables to AWS Systems Manager Parameter Store.
D. Move the user credentials from the Lambda environment to an encrypted .txt file. Store the file in an S3 bucket.

Answer: C

NEW QUESTION # 192
A developer is building a serverless application that is based on AWS Lambda. The developer initializes the AWS software development kit (SDK) outside of the Lambda handler function.
What is the PRIMARY benefit of this action?

A. Takes advantage of runtime environment reuse
B. Provides better error handling
C. Improves legibility and stylistic convention
D. Creates a new SDK instance for each invocation

Answer: A

Explanation:
Initializing the AWS SDK outside of the Lambda handler function takes advantage of runtime environment reuse. This means that the SDK only needs to be initialized once for all Lambda function invocations. This can improve application performance and efficiency.

NEW QUESTION # 193
A mobile app stores blog posts in an Amazon DynamoDB table. Millions of posts are added every day, and each post represents a single item in the table. The mobile app requires only recent posts. Any post that is older than 48 hours can be removed.
What is the MOST cost-effective way to delete posts that are older than 48 hours?

A. For each item, add a new attribute of type String that has a timestamp that is set to the blog post creation time. Create a script to find old posts with a table scan and remove posts that are older than 48 hours by using the BatchWriteItem API operation. Schedule a cron job on an Amazon EC2 instance once an hour to start the script.
B. For each item, add a new attribute of type String that has a timestamp that is set to the blog post creation time. Create a script to find old posts with a table scan and remove posts that are older than 48 hours by using the BatchWriteItem API operation. Place the script in a container image.
Schedule an Amazon Elastic Container Service (Amazon ECS) task on AWS Fargate that invokes the container every 5 minutes.
C. For each item, add a new attribute of type Date that has a timestamp that is set to 48 hours after the blog post creation time. Create a global secondary index (GSI) that uses the new attribute as a sort key. Create an AWS Lambda function that references the GSI and removes expired items by using the BatchWriteItem API operation. Schedule the function with an Amazon CloudWatch event every minute.
D. For each item, add a new attribute of type Number that has a timestamp that is set to 48 hours after the blog post creation time. Configure the DynamoDB table with a TTL that references the new attribute.

Answer: D

Explanation:
Solution (D) is the most cost-effective because it uses DynamoDB's Time to Live (TTL) to automatically remove expired items. The TTL is an item attribute that specifies the duration of time that an item should remain in the table. When an item's TTL expires, the item is automatically deleted from the table.

NEW QUESTION # 194
A developer is investigating an issue in part of a company's application. In the application messages are sent to an Amazon Simple Queue Service (Amazon SQS) queue The AWS Lambda function polls messages from the SQS queue and sends email messages by using Amazon Simple Email Service (Amazon SES) Users have been receiving duplicate email messages during periods of high traffic.
Which reasons could explain the duplicate email messages? (Select TWO.)

A. The SQS queue's visibility timeout is lower than or the same as the Lambda function's timeout.
B. The Amazon SES bounce rate metric is too high.
C. Standard SQS queues support at-least-once message delivery
D. Standard SQS queues support exactly-once processing, so the duplicate email messages are because of user error.
E. Amazon SES has the DomainKeys Identified Mail (DKIM) authentication incorrectly configured

Answer: C

Explanation:
* SQS Delivery Behavior: Standard SQS queues guarantee at-least-once delivery, meaning messages may be processed more than once. This can lead to duplicate emails in this scenario.
* Visibility Timeout: If the visibility timeout on the SQS queue is too short, a message might become visible for another consumer before the first Lambda function finishes processing it. This can also lead to duplicates.

NEW QUESTION # 195
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