DVA-C02 Quizfragen Und Antworten & DVA-C02 Deutsche Prüfungsfragen

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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Development with AWS Services	32%	- Develop code for AWS serverless applications 1. AWS Step Functions 2. Amazon EventBridge 3. AWS AppSync 4. Amazon API Gateway - Develop code for applications hosted on AWS 1. Amazon SQS 2. AWS CLI 3. AWS SDKs 4. AWS Lambda 5. Amazon DynamoDB 6. Amazon Cognito 7. Amazon S3 8. Amazon SNS 9. Amazon API Gateway 10. AWS CloudFormation - Use data stores in application development 1. Amazon EFS 2. Amazon RDS 3. Amazon ElastiCache 4. Amazon DynamoDB 5. Amazon S3
Topic 2: Deployment	24%	- Automate deployment testing 1. AWS CodeBuild 2. AWS CodeDeploy 3. AWS CodePipeline 4. AWS CodeCommit - Deploy code by using AWS CI/CD services 1. Canary deployments 2. AWS CodeBuild 3. Rolling deployments 4. GitHub integration 5. AWS CodeDeploy 6. AWS CodePipeline 7. Blue/green deployments 8. AWS CodeCommit - Test applications in development environments 1. Local testing of Lambda functions 2. AWS SAM local 3. Mocking AWS services - Prepare application artifacts to be deployed to AWS 1. Lambda deployment packages 2. AWS CDK 3. Docker containers 4. AWS CloudFormation 5. AWS SAM
Topic 3: Security	26%	- Implement encryption by using AWS services 1. AWS Certificate Manager 2. AWS KMS 3. AWS CloudHSM 4. AWS Secrets Manager 5. Amazon S3 encryption - Implement authentication and/or authorization for applications and AWS services 1. User pools and identity pools in Amazon Cognito 2. Bearer tokens (JWT, OAuth, AWS STS) 3. Identity federation (SAML, OpenID Connect, Amazon Cognito) 4. Resource-based policies, service policies, and principal policies 5. Role-based access control (RBAC) - Manage sensitive data in application code 1. Encryption of data at rest and in transit 2. AWS Systems Manager Parameter Store 3. AWS Secrets Manager 4. Environment variables
Topic 4: Troubleshooting and Optimization	18%	- Optimize applications by using AWS services and features 1. Caching strategies (ElastiCache, CloudFront) 2. Cost optimization 3. Memory and compute optimization 4. Concurrency and throttling 5. Data storage optimization - Instrument code for observability 1. AWS X-Ray 2. Amazon CloudWatch metrics 3. Custom metrics 4. Amazon CloudWatch alarms 5. Structured logging - Assist in a root cause analysis 1. AWS X-Ray 2. Amazon CloudWatch Logs 3. AWS CloudTrail 4. Application logging 5. Error handling and retries

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Amazon AWS Certified Developer - Associate DVA-C02 Prüfungsfragen mit Lösungen (Q713-Q718):

713. Frage
A development team uses AWS Elastic Beanstalk for application deployment. The development team has configured the application version lifecycle policy to limit the number of application versions to 25. However, even with the application version lifecycle policy, the source bundle is deleted from the Amazon S3 source bucket.
What should the development team do in the Elastic Beanstalk application version lifecycle settings to retain the source code in the S3 bucket?

A. Update the Elastic Beanstalk application version lifecycle policy to retain the source bundle in Amazon S3.
B. Update the Elastic Beanstalk application version lifecycle policy to increase the version quota to 50.
C. Enable versioning on the source bundle S3 bucket.
D. Disable the S3 bucket lifecycle policy to avoid the archiving of the source bundle.

Antwort: A

Begründung:
Elastic Beanstalk application version lifecycle settings can delete old application versions from Elastic Beanstalk records and can optionally delete the source bundle from the S3 bucket. To retain the source code, the lifecycle policy must be configured not to delete the source bundle from S3. Enabling S3 versioning is not the correct control because Elastic Beanstalk itself can be configured to retain or delete source bundles.
Increasing the version quota only changes how many application versions Elastic Beanstalk tracks before lifecycle cleanup occurs; it does not guarantee S3 source bundle retention. Disabling a separate S3 lifecycle policy is not the targeted Elastic Beanstalk setting. AWS documentation states that when Elastic Beanstalk deletes an application version, the source bundle remains in S3 unless the rule is configured to delete it. ( AWS Documentation )

714. Frage
A company has installed smart motes in all Its customer locations. The smart meter's measure power usage at
1minute intervals and send the usage readings to a remote endpoint tot collection. The company needs to create an endpoint that will receive the smart meter readings and store the readings in a database. The company wants to store the location ID and timestamp information.
The company wants to give Is customers low-latency access to their current usage and historical usage on demand The company expects demand to increase significantly. The solution must not impact performance or include downtime write seeing.
When solution will meet these requirements MOST cost-effectively?

A. Store the smart meter readings in Amazon EastCache for Reds Create a Sorted set key y using the location ID and timestamp columns. Use the columns to filter on the customers' data.
B. Store the smart meter readings in an Amazon RDS database. Create an index on the location ID and timestamp columns Use the columns to filter on the customers 'data.
C. Store the smart meter readings m Amazon S3 Parton the data by using the location ID and timestamp columns. Use Amazon Athena lo tiler on me customers' data.
D. Store the smart motor readings m an Amazon DynamoDB table Croato a composite Key oy using the location ID and timestamp columns. Use the columns to filter on the customers' data.

Antwort: D

Begründung:
The solution that will meet the requirements most cost-effectively is to store the smart meter readings in an Amazon DynamoDB table. Create a composite key by using the location ID and timestamp columns. Use the columns to filter on the customers' data. This way, the company can leverage the scalability, performance, and low latency of DynamoDB to store and retrieve the smart meter readings. The company can also use the composite key to query the data by location ID and timestamp efficiently. The other options either involve more expensive or less scalable services, or do not provide low-latency access to the current usage.
Reference: Working with Queries in DynamoDB

715. Frage
A company uses a custom root certificate authority certificate chain (Root CA Cert) that is 10 KB in size generate SSL certificates for its on-premises HTTPS endpoints. One of the company's cloud based applications has hundreds of AWS Lambda functions that pull date from these endpoints. A developer updated the trust store of the Lambda execution environment to use the Root CA Cert when the Lambda execution environment is initialized. The developer bundled the Root CA Cert as a text file in the Lambdas deployment bundle.
After 3 months of development the root CA Cert is no longer valid and must be updated. The developer needs a more efficient solution to update the Root CA Cert for all deployed Lambda functions. The solution must not include rebuilding or updating all Lambda functions that use the Root CA Cert. The solution must also work for all development, testing and production environment. Each environment is managed in a separate AWS account.
When combination of steps Would the developer take to meet these environments MOST cost-effectively?
(Select TWO)

A. Refactor the Lambda code to load the Root CA Cert from the Root CA Cert's location. Modify the runtime trust store outside the Lambda function handler.
B. Store the Root CA Cert in an Amazon S3 bucket. Create a resource- based policy to allow access to the bucket.
C. Store the Root CA Cert as a secret in AWS Secrets Manager. Create a resource-based policy. Add IAM users to allow access to the secret
D. Store the Root CA Cert as a Secure Sting parameter in aws Systems Manager Parameter Store Create a resource-based policy. Add IAM users to allow access to the policy.
E. Refactor the Lambda code to load the Root CA Cert from the Root CA Certs location. Modify the runtime trust store inside the Lambda function handler.

Antwort: A,D

Begründung:
Explanation
This solution will meet the requirements by storing the Root CA Cert as a Secure String parameter in AWS Systems Manager Parameter Store, which is a secure and scalable service for storing and managing configuration data and secrets. The resource-based policy will allow IAM users in different AWS accounts and environments to access the parameter without requiring cross-account roles or permissions. The Lambda code will be refactored to load the Root CA Cert from the parameter store and modify the runtime trust store outside the Lambda function handler, which will improve performance and reduce latency by avoiding repeated calls to Parameter Store and trust store modifications for each invocation of the Lambda function.
Option A is not optimal because it will use AWS Secrets Manager instead of AWS Systems Manager Parameter Store, which will incur additional costs and complexity for storing and managing a non-secret configuration data such as Root CA Cert. Option C is not optimal because it will deactivate the application secrets and monitor the application error logs temporarily, which will cause application downtime and potential data loss. Option D is not optimal because it will modify the runtime trust store inside the Lambda function handler, which will degrade performance and increase latency by repeating unnecessary operations for each invocation of the Lambda function.
References: AWS Systems Manager Parameter Store, [Using SSL/TLS to Encrypt a Connection to a DB Instance]

716. Frage
A company runs an AWS CodeBuild project on medium-sized Amazon EC2 instances. The company wants to cost optimize the project and reduce the provisioning time.

A. Configure the project to run on a CodeBuild reserved capacity fleet.
B. Select AWS Lambda as the compute mode for the CodeBuild project.
C. Configure the project to run on a CodeBuild on-demand fleet.
D. Set up Amazon S3 caching for the CodeBuild project.

Antwort: D

Begründung:
Comprehensive and Detailed Step-by-Step Explanation:
* Option D: Set up Amazon S3 Caching for CodeBuild:
* CodeBuild supports S3 caching to store intermediate build artifacts and dependencies. This reduces the time required to download dependencies during subsequent builds, effectively lowering costs and improving build performance.
* By using S3 caching, developers can optimize costs without changing the compute type or adding complexity.
* Why Other Options Are Incorrect:
* Option A:CodeBuild does not have a "reserved capacity fleet" option.
* Option B:AWS Lambda cannot be used as the compute mode for CodeBuild projects. CodeBuild uses its own managed build environments.
* Option C:CodeBuild already operates on an on-demand basis, so this does not address the need for optimization or reduced provisioning time.

717. Frage
A company hosts a client-side web application for one of its subsidiaries on Amazon S3. The web application can be accessed through Amazon CloudFront from https://www.example.com. After a successful rollout, the company wants to host three more client-side web applications for its remaining subsidiaries on three separate S3 buckets.
To achieve this goal, a developer moves all the common JavaScript files and web fonts to a central S3 bucket that serves the web applications. However, during testing, the developer notices that the browser blocks the JavaScript files and web fonts.
What should the developer do to prevent the browser from blocking the JavaScript files and web fonts?

A. Create four access points that allow access to the central S3 bucket. Assign an access point to each web application bucket.
B. Create a cross-origin resource sharing (CORS) configuration that allows access to the central S3 bucket. Add the CORS configuration to the central S3 bucket.
C. Create a bucket policy that allows access to the central S3 bucket. Attach the bucket policy to the central S3 bucket.
D. Create a Content-MD5 header that provides a message integrity check for the central S3 bucket. Insert the Content-MD5 header for each web application request.

Antwort: B

Begründung:
Explanation
This is a frequent trouble. Web applications cannot access the resources in other domains by default, except some exceptions. You must configure CORS on the resources to be accessed.
https://docs.aws.amazon.com/AmazonS3/latest/userguide/cors.html

718. Frage
......

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