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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
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. Use AWS SDKs and APIs 2. Implement architectural patterns 3. Develop serverless applications
Troubleshooting and Optimization	18%	- Debug and resolve errors 1. Identify and fix code defects 2. Resolve integration and configuration problems - Optimize application performance 1. Improve latency and throughput 2. Optimize resource usage and costs - Troubleshoot application issues 1. Analyze logs, metrics, and traces 2. Use Amazon CloudWatch, AWS X-Ray for monitoring
Security	26%	- Implement authentication and authorization 1. Manage IAM roles, policies, and permissions 2. Use Amazon Cognito for identity management - Apply security best practices 1. Follow AWS Well-Architected Framework security principles 2. Validate application security configurations - Secure application data 1. Implement encryption at rest and in transit 2. Manage secrets and credentials securely
Deployment	24%	- Prepare application artifacts for deployment 1. Package code and dependencies 2. Use infrastructure as code (AWS CloudFormation, AWS SAM) - Implement CI/CD pipelines 1. Automate deployment and testing workflows 2. Use AWS CodePipeline, CodeBuild, CodeDeploy - 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 Sample Questions (Q51-Q56):

NEW QUESTION # 51
A developer builds a serverless application on AWS by using Amazon API Gateway, AWS Lambda functions, and Amazon Route 53. During testing, the developer notices errors but cannot immediately locate the root cause.
To identify the errors, the developer needs to search all the application's logs.
What should the developer do to meet these requirements with the LEAST operational overhead?

A. Configure all the application's AWS services to publish a real-time feed of log events to an Amazon Kinesis Data Firehose delivery stream. Configure the delivery stream to publish all the logs to an Amazon S3 bucket. Use Amazon OpenSearch Service to search and analyze the logs.
B. Set up Route 53 health checks to monitor the application's availability. Turn on AWS CloudTrail logs for all the AWS services that the application uses. Send the logs to a specified Amazon S3 bucket. Use Amazon Athena to query the log files directly from Amazon S3.
C. Set up Route 53 health checks to monitor the application's availability. Turn on Amazon CloudWatch Logs for the API Gateway stages to log API requests with a JSON log format. Use CloudWatch Logs Insights to search and analyze the logs from the AWS services that the application uses.
D. Set up API Gateway health checks to monitor the application's availability. Use the Amazon CloudWatch PutMetricData API operation to publish the logs to CloudWatch. Search and query the logs by using Amazon Athena.

Answer: C

Explanation:
https://docs.aws.amazon.com/lambda/latest/dg/monitoring-cloudwatchlogs.html

NEW QUESTION # 52
Users are reporting errors in an application. The application consists of several micro services that are deployed on Amazon Elastic Container Serves (Amazon ECS) with AWS Fargate.
When combination of steps should a developer take to fix the errors? (Select TWO)

A. Deploy AWS X-Ray as a sidecar container to the micro services. Update the task role policy to allow access to me X -Ray API.
B. Deploy AWS X-Ray as a daemon set to the Fargate cluster. Update the service role policy to allow access to the X-Ray API.
C. Instrument the application by using the AWS X-Ray SDK. Update the application to use the Put- XrayTrace API call to communicate with the X-Ray API.
D. Instrument the ECS task to send the stout and spider- output to Amazon CloudWatch Logs. Update the task role policy to allow the cloudwatch Putlogs action.
E. Instrument the application by using the AWS X-Ray SDK. Update the application to communicate with the X-Ray daemon.

Answer: A,D

Explanation:
The combination of steps that the developer should take to fix the errors is to deploy AWS X-Ray as a sidecar container to the microservices and instrument the ECS task to send the stdout and stderr output to Amazon CloudWatch Logs. This way, the developer can use AWS X-Ray to analyze and debug the performance of the microservices and identify any issues or bottlenecks. The developer can also use CloudWatch Logs to monitor and troubleshoot the logs from the ECS task and detect any errors or exceptions. The other options either involve using AWS X-Ray as a daemon set, which is not supported by Fargate, or using the PutTraceSegments API call, which is not necessary when using a sidecar container.
Reference: Using AWS X-Ray with Amazon ECS

NEW QUESTION # 53
A developer is testing a RESTful application that is deployed by using Amazon API Gateway and AWS Lambda When the developer tests the user login by using credentials that are not valid, the developer receives an HTTP 405 METHOD_NOT_ALLOWED error The developer has verified that the test is sending the correct request for the resource Which HTTP error should the application return in response to the request?

A. HTTP 404
B. HTTP 505
C. HTTP 503
D. HTTP 401

Answer: D

Explanation:
Explanation
The HTTP 401 error indicates that the request has not been applied because it lacks valid authentication credentials for the target resource. This is the appropriate error code to return when the user login fails due to invalid credentials. The HTTP 405 error means that the method specified in the request is not allowed for the resource identified by the request URI, which is not the case here. The other error codes are not relevant to the authentication failure scenario. References
* HTTP Status Codes
* AWS Lambda Function Errors in API Gateway

NEW QUESTION # 54
A healthcare company uses AWS Amplify to host a patient management system. The system uses Amazon API Gateway to expose RESTful APIs. The backend logic of the system is handled by AWS Lambda functions.
One of the Lambda functions receives patient data that includes personally identifiable information (PII). The Lambda function sends the patient data to an Amazon DynamoDB table. The company must encrypt all patient data at rest and in transit before the data is stored in DynamoDB.

A. Configure a DynamoDB stream on the table to invoke a Lambda function. Configure the Lambda function to use an AWS KMS key to encrypt the DynamoDB table and to update the table.
B. Configure the Lambda function to use AWS KMS keys with the AWS Database Encryption SDK to encrypt the patient data before sending the data to DynamoDB.
C. Use AWS managed AWS KMS keys to encrypt the data in the DynamoDB table.
D. Use an AWS Step Functions workflow to transfer the data to an Amazon SQS queue. Configure a Lambda function to encrypt the data in the queue before sending the data to the DynamoDB table.

Answer: B

Explanation:
Comprehensive Detailed Explanation with all AWS References
* Why Option A is Correct:Encrypting PII at rest and in transit before storing it in DynamoDB ensures end-to-end security. Using the AWS Database Encryption SDK with KMS keys allows the Lambda function to encrypt data before transmission, meeting security and compliance requirements.
* Why Other Options are Incorrect:
* Option B: While AWS-managed KMS keys encrypt DynamoDB data at rest, they do not encrypt data in transit.
* Option C: DynamoDB streams process updates after the data is written to the table, failing to encrypt PII in transit.
* Option D: Step Functions and SQS add unnecessary complexity and still require encryption logic for both transit and at rest.
* AWS Documentation References:
* Encrypting Data in DynamoDB
* AWS Database Encryption SDK

NEW QUESTION # 55
A company has an application that is hosted on Amazon EC2 instances. The application stores objects in an Amazon S3 bucket and allows users to download objects from the S3 bucket. A developer turns on S3 Block Public Access for the S3 bucket. After this change, users report errors when they attempt to download objects. The developer needs to implement a solution so that only users who are signed in to the application can access objects in the S3 bucket.
Which combination of steps will meet these requirements in the MOST secure way? (Choose two.)

A. Create an EC2 instance profile and role with an appropriate policy. Associate the role with the EC2 instances.
B. Modify the application to use the S3 GetObject API call and to return the object handle to the user.
C. Modify the application to use the S3 GeneratePresignedUrl API call.
D. Create an IAM user with an appropriate policy. Store the access key ID and secret access key on the EC2 instances.
E. Modify the application to delegate requests to the S3 bucket.

Answer: A,C

NEW QUESTION # 56
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