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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Security	26%	- Application authentication and authorization 1. IAM roles and policies 2. Cognito user authentication - Data security 1. Encryption using AWS KMS 2. Secure API access patterns
Topic 2: Development with AWS Services	32%	- AWS core services development 1. Amazon DynamoDB integration patterns 2. AWS Lambda functions development 3. Amazon S3 usage in applications - Application development and integration 1. Event-driven architectures with SNS/SQS 2. API Gateway and REST APIs
Topic 3: Troubleshooting and Optimization	18%	- Performance optimization 1. Fault tolerance and resilience patterns 2. Application performance tuning - Monitoring and logging 1. Amazon CloudWatch metrics and logs
Topic 4: Deployment	24%	- Infrastructure as code 1. AWS CloudFormation templates - CI/CD and deployment strategies 1. AWS CodePipeline workflows 2. AWS CodeBuild and CodeDeploy usage

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Amazon AWS Certified Developer - Associate Sample Questions (Q702-Q707):

NEW QUESTION # 702
A developer has implemented an AWS Lambda function that inserts new customers into an Amazon RDS database. The function is expected to run hundreds of times each hour. The function and RDS database are in the same VPC. The function is configured to use 512 MB of RAM and is based on the following pseudo code:

After successfully testing the function multiple times, the developer notices that the execution time is longer than expected.
What should the developer do to improve performance?

A. Replace Amazon RDS with Amazon DynamoDB to implement control over the number of writes per second.
B. Increase the size of the RDS database to facilitate an increased number of database connections each hour.
C. Move the database connection and close statement out of the handler. Place the connection in the global space.
D. Increase the reserved concurrency of the Lambda function.

Answer: C

NEW QUESTION # 703
A company is migrating legacy internal applications to AWS. Leadership wants to rewrite the internal employee directory to use native AWS services. A developer needs to create a solution for storing employee contact details and high-resolution photos for use with the new application.
Which solution will enable the search and retrieval of each employee's individual details and high-resolution photos using AWS APIs?

A. Encode each employee's contact information and photos using Base64. Store the information in an Amazon DynamoDB table using a sort key.
B. Store employee contact information in an Amazon RDS DB instance with the photos stored in Amazon Elastic File System (Amazon EFS).
C. Use Amazon Cognito user pools to implement the employee directory in a fully managed software-as-a-service (SaaS) method.
D. Store each employee's contact information in an Amazon DynamoDB table along with the object keys for the photos stored in Amazon S3.

Answer: D

Explanation:
Amazon DynamoDB is a fully managed NoSQL database service that provides fast and consistent performance with seamless scalability. The developer can store each employee's contact information in a DynamoDB table along with the object keys for the photos stored in Amazon S3. Amazon S3 is an object storage service that offers industry-leading scalability, data availability, security, and performance. The developer can use AWS APIs to search and retrieve the employee details and photos from DynamoDB and S3.
Reference:
[Amazon DynamoDB]
[Amazon Simple Storage Service (S3)]

NEW QUESTION # 704
A company has an application on AWS. In the application, users can upload and share images.
The images are stored in an Amazon S3 bucket. The application uses temporary tokens to upload images to the S3 bucket and create presigned URLs for users to access the images.
Some users report that the presigned URLs that they received do not work. A developer tests the application and finds that some presigned URLs are redirected to an error page. The presigned URLs have not expired.
What is the cause of the error?

A. The application's access to the tokens that allow it to generate presigned URLs was disabled.
B. The users uploaded a XML file to the application instead of an image file.
C. The temporary token that was used to generate the presigned URL is no longer valid.
D. The users are not allowed to access the object in the S3 bucket.

Answer: C

Explanation:
A presigned URL that is generated by using temporary security credentials depends on the validity of those credentials. If the temporary token expires or is otherwise no longer valid before the presigned URL expires, Amazon S3 cannot validate the request signature and redirects the request to an error page even though the URL itself has not yet expired.

NEW QUESTION # 705
An ecommerce application is running behind an Application Load Balancer. A developer observes some unexpected load on the application during non-peak hours. The developer wants to analyze patterns for the client IP addresses that use the application. Which HTTP header should the developer use for this analysis?

A. The X-Forwarded-For header
B. The X-Forwarded-Port header
C. The X-Forwarded-Proto header
D. The X-F Forwarded-Host header

Answer: A

Explanation:
The HTTP header that the developer should use for this analysis is the X-Forwarded-For header. This header contains the IP address of the client that made the request to the Application Load Balancer. The developer can use this header to analyze patterns for the client IP addresses that use the application. The other headers either contain information about the protocol, host, or port of the request, which are not relevant for the analysis.
Reference: How Application Load Balancer works with your applications

NEW QUESTION # 706
A company is creating an AWS Step Functions state machine to run a set of tests for an application. The tests need to run when a specific AWS CloudFormation stack is deployed. Which combination of steps will meet these requirements? (Choose two.)

A. Create a pipe in Amazon EventBridge Pipes that has a source of the EventBridge rule. Set the state machine as a target.
B. Add the state machine as a target of the EventBridge rule.
C. Create an AWS Lambda function to invoke the state machine.
D. Create an Amazon EventBridge rule on the default bus that matches on a detail type of CloudFormation stack status change, a status of UPDATE_IN_PROGRESS, and the stack ID of the CloudFormation stack.
E. Create a pipe in Amazon EventBridge Pipes that has a source of the default event bus. Set the Lambda function as a target. Filter on a detail type of CloudFormation stack status change, a status of UPDATE_IN_PROGRESS, and the stack ID of the CloudFormation stack.

Answer: B,D

NEW QUESTION # 707
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