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Um für die Amazon DVA-C02 Prüfung zugelassen zu werden, müssen die Kandidaten mindestens ein Jahr Erfahrung in der Entwicklung und Wartung von AWS-basierten Anwendungen haben. Sie sollten ein gutes Verständnis der AWS-Kernservices haben und mindestens eine Programmiersprache wie Java, Python oder Ruby beherrschen. Die Kandidaten sollten auch Erfahrung im Umgang mit AWS SDKs und APIs haben und mit AWS CLI und CloudFormation vertraut sein.

Amazon AWS Certified Developer - Associate DVA-C02 Prüfungsfragen mit Lösungen (Q749-Q754):

749. Frage
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 context 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 event object. Configure the application to write logs to standard output.

Antwort: B

Begründung:
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]

750. Frage
A company has an Amazon S3 bucket containing premier content that it intends to make available to only paid subscribers of its website. The S3 bucket currently has default permissions of all objects being private to prevent inadvertent exposure of the premier content to non-paying website visitors.
How can the company Limit the ability to download a premier content file in the S3 Bucket to paid subscribers only?

A. Generate a pre-signed object URL for the premier content file when a pad subscriber requests a download.
B. Enable server-side encryption on the S3 bucket for data protection against the non-paying website visitors.
C. Apply a bucket policy that allows anonymous users to download the content from the S3 bucket.
D. Add a Docket policy that requires multi-factor authentication for request to access the S3 bucket objects.

Antwort: A

Begründung:
This solution will limit the ability to download a premier content file in the S3 bucket to paid subscribers only because it uses a pre-signed object URL that grants temporary access to an S3 object for a specified duration.
The pre-signed object URL can be generated by the company's website when a paid subscriber requests a download, and can be verified by Amazon S3 using the signature in the URL. Option A is not optimal because it will allow anyone to download the content from the S3 bucket without verifying their subscription status. Option C is not optimal because it will require additional steps and costs to configure multi-factor authentication for accessing the S3 bucket objects, which may not be feasible or user-friendly for paid subscribers. Option D is not optimal because it will not prevent non-paying website visitors from accessing the S3 bucket objects, but only encrypt them at rest.
References: Share an Object with Others, [Using Amazon S3 Pre-Signed URLs]

751. Frage
Given the source code for an AWS Lambda function in the local file store.py containing a handler function called get_store and the following AWS CloudFormation template:

What should be done to prepare the template so that it can be deployed using the AWS CLI command aws cloudformation deploy?

A. Use aws lambda zip to package the source file together with the CloudFormation template and deploy the resulting zip archive.
B. Use aws cloudformation package to upload the source code to an Amazon S3 bucket and produce a modified CloudFormation template
C. Use aws cloudformation compile to base64 encode and embed the source file into a modified CloudFormation template.
D. Use aws server less create-package to embed the source file directly into the existing CloudFormation template.

Antwort: B

Begründung:
The AWS SAM (Serverless Application Model) template shown uses Transform:
AWS::Serverless-2016-10-31, which requires preparing the Lambda source code for deployment using the command:
aws cloudformation package --template-file template.yaml --s3-bucket YOUR_BUCKET_NAME -- output-template-file packaged.yaml This command uploads the source code (e.g., store.py) to an S3 bucket and replaces the CodeUri in the template with a reference to the S3 location, producing a modified CloudFormation template that can then be deployed using aws cloudformation deploy.

752. Frage
A developer is designing an event-driven architecture. An AWS Lambda function that processes data needs to push processed data to a subset of four consumer Lambda functions. The data must be routed based on the value of one field in the data. Which solution will meet these requirements with the LEAST operational overhead?

A. Create an Amazon Simple Notification Service (Amazon SNS) topic. Subscribe the four consumer Lambda functions to the topic. Add message filtering logic to each consumer Lambda function.
Subscribe the data-processing Lambda function to the SNS topic.
B. Create an Amazon Simple Queue Service (Amazon SQS) queue and event source mapping for each consumer Lambda function. Add message routing logic to the data-processing Lambda function.
C. Create a single Amazon Simple Notification Service (Amazon SNS) topic. Subscribe the four consumer Lambda functions to the topic. Add SNS subscription filter policies to each subscription.Configure the data-processing Lambda function to publish to the topic.
D. Create a separate Amazon Simple Notification Service (Amazon SNS) topic and subscription for each consumer Lambda function. Add message routing logic to the data-processing Lambda function to publish to the appropriate topic.

Antwort: C

Begründung:
Single SNS topic with subscription filter policies is the most efficient solution with the least operational overhead. By using a single SNS topic and configuring subscription filter policies on each consumer Lambda function, you can route messages based on specific fields in the data without adding any additional processing logic inside the Lambda functions. SNS filters allow you to match specific message attributes and route the data to the correct consumer Lambda functions efficiently.

753. Frage
An ecommerce startup is preparing for an annual sales event. As the traffic to the company's application increases, the development team wants to be notified when the Amazon EC2 instance's CPU utilization exceeds 80%.
Which solution will meet this requirement?

A. Create a cron job on the EC2 instance that invokes the --describe-instance-information command on the host instance every 15 minutes and sends the results to an Amazon SNS topic.
B. Create a custom AWS CloudTrail alarm that sends a notification to an Amazon SNS topic when the CPU utilization exceeds 80%.
C. Create an AWS Lambda function that queries the AWS CloudTrail logs for the CPUUtilization metric every 15 minutes and sends a notification to an Amazon SNS topic when the CPU utilization exceeds
80%.
D. Create a custom Amazon CloudWatch alarm that sends a notification to an Amazon SNS topic when the CPU utilization exceeds 80%.

Antwort: D

Begründung:
Step-by-Step Breakdown:
Requirement Summary:
* Get notified when EC2 CPU Utilization > 80%
Option A: CloudWatch Alarm with SNS
* Correct and standard AWS practice
* CloudWatch automatically collects EC2 metrics, including CPUUtilization.
* You can set a CloudWatch Alarm with a threshold (80% in this case).
* Then, trigger an SNS notification to email, SMS, Lambda, etc.
Option B: AWS CloudTrail alarm
* Incorrect: CloudTrail logs API activity, not performance metrics.
* It doesn't track metrics like CPU utilization.
Option C: Cron job on EC2 running --describe-instance-information
* Incorrect: This doesn't give CPU usage.
* Also inefficient, and polling is bad practice when CloudWatch already monitors this natively.
Option D: Lambda function querying CloudTrail for CPU usage
* Incorrect and conceptually flawed.
* CloudTrail does not store performance metrics; CloudWatch does.
* CloudWatch Alarms for EC2: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring
/AlarmThatSendsEmail.html
* EC2 Metrics in CloudWatch: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide
/viewing_metrics_with_cloudwatch.html
* Amazon SNS Notification Setup: https://docs.aws.amazon.com/sns/latest/dg/sns-email-notifications.
html

754. Frage
......

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