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Amazon AWS Certified Developer - Associate Sample Questions (Q202-Q207):

NEW QUESTION # 202
A developer is writing an AWS Lambda function. The developer wants to log key events that occur while the Lambda function runs. The developer wants to include a unique identifier to associate the events with a specific function invocation. The developer adds the following code to the Lambda function:

Which solution will meet this requirement?

A. Obtain the request identifier from the AWS request ID field in the event object. Configure the application to write logs to a file.
B. Obtain the request identifier from the AWS request ID field in the event object. Configure the application to write logs to standard output.
C. Obtain the request identifier from the AWS request ID field in the context object. Configure the application to write logs to a file.
D. Obtain the request identifier from the AWS request ID field in the context object. Configure the application to write logs to standard output.

Answer: D

Explanation:
Explanation
https://docs.aws.amazon.com/lambda/latest/dg/nodejs-context.html
https://docs.aws.amazon.com/lambda/latest/dg/nodejs-logging.html
There is no explicit information for the runtime, the code is written in Node.js.
AWS Lambda is a service that lets developers run code without provisioning or managing servers. The developer can use the AWS request ID field in the context object to obtain a unique identifier for each function invocation. The developer can configure the application to write logs to standard output, which will be captured by Amazon CloudWatch Logs. This solution will meet the requirement of logging key events with a unique identifier.
References:
* [What Is AWS Lambda? - AWS Lambda]
* [AWS Lambda Function Handler in Node.js - AWS Lambda]
* [Using Amazon CloudWatch - AWS Lambda]

NEW QUESTION # 203
A company has an application that uses an AWS Lambda function to process customer orders. The company notices that the application processes some orders more than once.
A developer needs to update the application to prevent duplicate processing.
Which solution will meet this requirement with the LEAST implementation effort?

A. Implement a de-duplication mechanism that uses Amazon DynamoDB as the control database.
Configure the Lambda function to check for the existence of a unique identifier before processing each event.
B. Create a custom Amazon ECS task to perform idempotency checks. Use AWS Step Functions to integrate the ECS task with the Lambda function.
C. Use Amazon Athena to query processed events to identify duplicate records. Add processing logic to the Lambda function to handle the duplication scenarios that the query identifies.
D. Configure the Lambda function to retry failed invocations. Implement a retry mechanism that has a fixed delay between attempts to handle duplicate events.

Answer: A

Explanation:
Requirement Summary:
* Orders are being processedmore than once
* Need to preventduplicate processing
* Looking forleast implementation effort
Key Concept:
* Lambda + Event-driven patternscan occasionally result induplicate invocations(at-least-once delivery model)
* You needidempotency(i.e., prevent repeated processing of same event)
Evaluate Options:
#A. Use DynamoDB for de-duplication
* #Simple and widely used approach
* Store a unique orderId as the primary key
* Before processing,check if order exists
* If yes # skip
* If no # process and store the ID
* #Minimal code changes required
B: ECS + Step Functions
* #Overkill for basic de-duplication
* Adds significant complexity
C: Retry logic with fixed delay
* #Doesn't prevent duplication -makes it worse
* Retrying might trigger thesame message again
D: Athena to identify duplicates
* #Reactive solution, not preventative
* Not suitable for real-time event de-duplication
* Lambda idempotency:https://docs.aws.amazon.com/lambda/latest/dg/invocation-retries.html
* Using DynamoDB for idempotent design: https://aws.amazon.com/blogs/compute/how-to-design- idempotent-APIs-on-aws/

NEW QUESTION # 204
A developer is troubleshooting an application mat uses Amazon DynamoDB in the uswest-2 Region. The application is deployed to an Amazon EC2 instance. The application requires read-only permissions to a table that is named Cars The EC2 instance has an attached IAM role that contains the following IAM policy.

When the application tries to read from the Cars table, an Access Denied error occurs.
How can the developer resolve this error?

A. Create a trust relationship between the role and dynamodb Amazonas com.
B. Modify the IAM policy to include the dynamodb * action
C. Modify the IAM policy resource to be "arn aws dynamo* us-west-2 account-id table/*"
D. Create a trust policy that specifies the EC2 service principal. Associate the role with the policy.

Answer: D

Explanation:
Explanation
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/access-control-overview.html#access-con

NEW QUESTION # 205
A developer is creating a service that uses an Amazon S3 bucket for image uploads. The service will use an AWS Lambda function to create a thumbnail of each image Each time an image is uploaded the service needs to send an email notification and create the thumbnail The developer needs to configure the image processing and email notifications setup.
Which solution will meet these requirements?

A. Create an Amazon Simple Notification Service (Amazon SNS) topic. Configure S3 event notifications with a destination of the SNS topic. Subscribe the Lambda function to the SNS topic. Create an Amazon Simple Queue Service (Amazon SQS) queue Subscribe the SQS queue to the SNS topic Create an email notification subscription to the SQS queue.
B. Create an Amazon Simple Queue Service (Amazon SQS) queue. Send S3 event notifications to Amazon EventBridge. Create an EventBndge rule that runs the Lambda function when images are uploaded to the S3 bucket Create an EventBridge rule that sends notifications to the SQS queue Create an email notification subscription to the SQS queue
C. Create an Amazon Simple Notification Service (Amazon SNS) topic Configure S3 event notifications with a destination of the SNS topic Subscribe the Lambda function to the SNS topic Create an email notification subscription to the SNS topic
D. Create an Amazon Simple Queue Service (Amazon SQS) queue Configure S3 event notifications with a destination of the SQS queue Subscribe the Lambda function to the SQS queue Create an email notification subscription to the SQS queue.

Answer: C

Explanation:
* SNS as a Fan-out Mechanism: SNS is perfect for triggering multiple actions from a single event (here, the image upload).
* Workflow:
* SNS Topic: Create an SNS topic that will be the central notification point.
* S3 Event Notification: Configure the S3 bucket to send 'Object Created' event notifications to the SNS topic.
* Lambda Subscription: Subscribe your thumbnail-creating Lambda function to the SNS topic.
* Email Subscription: Subscribe an email address to the SNS topic to trigger notifications.
References:
* S3 Event Notifications: https://docs.aws.amazon.com/AmazonS3/latest/userguide/EventNotifications.
html
* SNS Subscriptions: https://docs.aws.amazon.com/sns/latest/dg/SNSMobilePush.html

NEW QUESTION # 206
A developer is migrating a containerized application from an on-premises environment to an Amazon ECS cluster.
In the on-premises environment, the container uses a Docker file to store the application. Service dependency configurations such as databases, caches, and storage volumes are stored in a docker-compose.yml file.
Both files are located at the top level of the code base that the developer needs to containerize. When the developer deploys the code to Amazon ECS, the instructions from the Docker file are carried out. However, none of the configurations from docker-compose.yml are applied.
The developer needs to resolve the error and ensure the configurations are applied.

A. Update the service type of the ECS cluster to REPLICA, and redeploy the stack.
B. Store the file path for the docker-compose.yml file as a Docker label. Add the label to the ECS cluster's container details.
C. Add the details from the docker-compose.yml file to an ECS task definition. Associate the task with the ECS cluster.
D. Create a namespace in the ECS cluster. Associate the docker-compose.yml file to the namespace.

Answer: C

Explanation:
* Why Option B is Correct:Amazon ECS does not natively process docker-compose.yml files. Instead, the configurations from docker-compose.yml must be converted into ECS-compatible configurations within a task definition. Task definitions are the primary way to specify container configurations in ECS, including service dependencies like databases, caches, and volumes.
* Steps to Resolve the Error:
* Extract the configurations from the docker-compose.yml file.
* Map the dependencies and settings to the appropriate ECS task definition fields.
* Deploy the task definition to the ECS cluster.
* Why Other Options are Incorrect:
* Option A: Docker labels do not directly impact ECS task execution or integrate with ECS service configurations.
* Option C: ECS namespaces do not exist as a feature.
* Option D: Changing the service type to REPLICA does not resolve the issue of missing service dependency configurations.
* AWS Documentation References:
* Amazon ECS Task Definitions
* Migrating Docker Compose Workloads to ECS

NEW QUESTION # 207
......

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