DVA-C02 Schulungsunterlagen - DVA-C02 Praxisprüfung

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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Security	26%	- Implement authentication and authorization 1. Use Amazon Cognito for identity management 2. Manage IAM roles, policies, and permissions - Apply security best practices 1. Follow AWS Well-Architected Framework security principles 2. Validate application security configurations - Secure application data 1. Manage secrets and credentials securely 2. Implement encryption at rest and in transit
Troubleshooting and Optimization	18%	- Optimize application performance 1. Optimize resource usage and costs 2. Improve latency and throughput - Debug and resolve errors 1. Resolve integration and configuration problems 2. Identify and fix code defects - Troubleshoot application issues 1. Analyze logs, metrics, and traces 2. Use Amazon CloudWatch, AWS X-Ray for monitoring
Development with AWS Services	32%	- Integrate AWS services into applications 1. Use AWS Lambda, API Gateway, Amazon EventBridge 2. Implement messaging and event-driven workflows - Interact with AWS data services 1. Work with Amazon DynamoDB, Amazon S3 2. Implement caching and data storage strategies - Write code for applications hosted on AWS 1. Develop serverless applications 2. Use AWS SDKs and APIs 3. Implement architectural patterns
Deployment	24%	- Prepare application artifacts for deployment 1. Use infrastructure as code (AWS CloudFormation, AWS SAM) 2. Package code and dependencies - Implement CI/CD pipelines 1. Use AWS CodePipeline, CodeBuild, CodeDeploy 2. Automate deployment and testing workflows - Deploy applications on AWS 1. Perform safe updates and rollbacks 2. Deploy to AWS Lambda, Amazon EC2, Elastic Beanstalk

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Amazon AWS Certified Developer - Associate DVA-C02 Prüfungsfragen mit Lösungen (Q775-Q780):

775. Frage
A developer is creating a template that uses AWS CloudFormation to deploy an application. The application is serverless and uses Amazon API Gateway, Amazon DynamoDB, and AWS Lambda.
Which AWS service or tool should the developer use to define serverless resources in YAML?

A. AWS Cloud Development Kit (AWS CDK)
B. AWS Elastic Beanstalk
C. CloudFormation serverless intrinsic functions
D. AWS Serverless Application Model (AWS SAM)

Antwort: D

Begründung:
AWS Serverless Application Model (AWS SAM) is an open-source framework that enables developers to build and deploy serverless applications on AWS. AWS SAM uses a template specification that extends AWS CloudFormation to simplify the definition of serverless resources such as API Gateway, DynamoDB, and Lambda. The developer can use AWS SAM to define serverless resources in YAML and deploy them using the AWS SAM CLI.
References:
* [What Is the AWS Serverless Application Model (AWS SAM)? - AWS Serverless Application Model]
* [AWS SAM Template Specification - AWS Serverless Application Model]

776. Frage
A company is developing a serverless application that consists of various AWS Lambda functions behind Amazon API Gateway APIs. A developer needs to automate the deployment of Lambda function code. The developer will deploy updated Lambda functions with AWS CodeDeploy. The deployment must minimize the exposure of potential errors to end users. When the application is in production, the application cannot experience downtime outside the specified maintenance window. Which deployment configuration will meet these requirements with the LEAST deployment time?

A. Use the AWS CodeDeploy linear deployment configuration to shift 10% of the traffic every minute.
B. Use the AWS CodeDeploy in-place deployment configuration for the Lambda functions. Shift all traffic immediately after deployment.
C. Use the AWS CodeDeploy predefined canary deployment configuration to shift 10% of the traffic immediately and shift the remaining traffic after 5 minutes.
D. Use the AWS CodeDeploy all-at-once deployment configuration to shift all traffic to the updated versions immediately.

Antwort: C

Begründung:
The AWS CodeDeploy predefined canary deployment configuration shifts 10% of traffic immediately, then shifts the remaining 90% after 5 minutes. This approach helps minimize the exposure of errors to users while ensuring fast rollback if needed, and provides a short overall deployment time. It balances speed and safety, making it ideal for production environments with limited downtime windows.

777. Frage
A company is developing an ecommerce application that uses Amazon API Gateway APIs. The application uses AWS Lambda as a backend. The company needs to test the code in a dedicated, monitored test environment before the company releases the code to the production environment.
When solution will meet these requirements?

A. Use a single stage in API Gateway. Configure a API client to send a query parameter that indicated the environment. Add different code blocks tor afferent environments in the Lambda Junction to match the value of the query parameter.
B. Use a single stage in API Gateway. Create a Lambda function for each environment. Configure API clients to send a query parameter that indicates the endowment and the specific lambda function.
C. Use multiple stages in API Gateway. Create a Lambda function for each environment. Configure API Gateway stage variables to route traffic to the Lambda function in different environments.
D. Use multiple stages in API Gateway. Create a single Lambda function for all environments. Add different code blocks for different environments in the Lambda function based on Lambda environments variables.

Antwort: C

Begründung:
The solution that will meet the requirements is to use multiple stages in API Gateway. Create a Lambda function for each environment. Configure API Gateway stage variables to route traffic to the Lambda function in different environments. This way, the company can test the code in a dedicated, monitored test environment before releasing it to the production environment. The company can also use stage variables to specify the Lambda function version or alias for each stage, and avoid hard-coding the Lambda function name in the API Gateway integration. The other options either involve using a single stage in API Gateway, which does not allow testing in different environments, or adding different code blocks for different environments in the Lambda function, which increases complexity and maintenance.

778. Frage
A company runs a serverless application on AWS. The application includes an AWS Lambda function. The Lambda function processes data and stores the data in an Amazon RDS for PostgreSQL database. A developer created user credentials in the database for the application.
The developer needs to use AWS Secrets Manager to manage the user credentials. The password must be rotated on a regular basis. The solution needs to ensure that there is high availability and no downtime for the application during secret rotation.
What should the developer do to meet these requirements?

A. Configure managed rotation with the alternating users rotation strategy.
B. Configure automatic rotation with the single user rotation strategy.
C. Configure managed rotation with the single user rotation strategy.
D. Configure automatic rotation with the alternating users rotation strategy.

Antwort: D

Begründung:
To rotate database credentials without downtime, Secrets Manager recommends the alternating users (dual user) rotation strategy. With a single-user strategy, Secrets Manager changes the password for the same database user that the application is actively using. If the application continues using cached/old credentials during rotation, authentication failures and downtime can occur.
With the alternating users strategy, two database users exist (often named something like appuser and appuser_clone). Secrets Manager alternates which user is "active" in the secret. During rotation, Secrets Manager updates the inactive user's password, verifies it, updates the secret to point to the newly updated user, and then (optionally) retires the old credentials. This approach minimizes disruption because there is always one known-good credential set while the other is being updated.
The question specifically requires regular rotation using Secrets Manager. That is achieved by enabling automatic rotation on the secret with a schedule (for example, every 30/60/90 days). Automatic rotation invokes the rotation Lambda (AWS-provided or configured) and performs the workflow without manual intervention.
Option D combines both requirements: automatic rotation plus the alternating users strategy for high availability and no downtime.
Option B mentions alternating users but "managed rotation" is not the standard term used in these choices as the primary differentiator-automatic rotation is the necessary capability to rotate regularly without manual effort.
Options A and C (single user) are more likely to cause downtime during rotation.
Therefore, configure automatic rotation with the alternating users rotation strategy.

779. Frage
A developer adds new dependencies to an existing AWS Lambda function. The developer cannot deploy the Lambda function because the unzipped deployment package exceeds the maximum size quota for the Lambda function. The instruction set architecture of the Lambda function is x86_64.
The developer must implement a solution to deploy the Lambda function with the new dependencies.
Which solution will meet these requirements?

A. Create and deploy a Lambda container image with all the dependencies.
B. Change the instruction set architecture of the Lambda function to use an arm64 architecture.
C. Associate an Amazon Elastic Block Store (Amazon EBS) volume with the Lambda function. Store all the dependencies on the EBS volume.
D. Create a snapshot of all the dependencies. Configure the Lambda function to use the snapshot.

Antwort: A

Begründung:
AWS Lambda supports deploying functions as container images, which allows developers to include larger dependencies or custom binaries. Container images can be up to 10 GB in size, which is significantly larger than the maximum size limit for zipped Lambda deployment packages (250 MB). This solution enables the developer to package the Lambda function with all its dependencies and deploy it without exceeding the size limitations of traditional deployment packages.

780. Frage
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