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The AWS Certified Developer - Associate exam is an essential certification for developers who want to demonstrate their expertise in developing and deploying applications on the AWS platform. AWS Certified Developer - Associate certification can help candidates advance their careers and open up new opportunities in the field of cloud computing.
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A company built an online event platform. For each event, the company organizes quizzes and generates leaderboards that are based on the quiz scores. The company stores the leaderboard data in Amazon DynamoDB and retains the data for 30 days after an event is complete. The company then uses a scheduled job to delete the old leaderboard data.
The DynamoDB table is configured with a fixed write capacity. During the months when many events occur, the DynamoDB write API requests are throttled when the scheduled delete job runs.
A developer must create a long-term solution that deletes the old leaderboard data and optimizes write throughput.
Which solution meets these requirements?
A. Configure a TTL attribute for the leaderboard data.
B. Use AWS Step Functions to schedule and delete the leaderboard data.
C. Set a higher write capacity when the scheduled delete job runs.
D. Use DynamoDB Streams to schedule and delete the leaderboard data.
Answer: A
NEW QUESTION # 111
A company has a serverless application that uses an Amazon API Gateway API to invoke an AWS Lambda function. A developer creates a fix for a defect in the Lambda function code. The developer wants to deploy this fix to the production environment. To test the changes, the developer needs to send 10% of the live production traffic to the updated Lambda function version.
Options:
A. A. Publish a new version of the Lambda function that contains the updated code.
B. C. Create an alias for the Lambda function. Configure weighted routing on the alias. Specify a 10% weight for the new Lambda function version.
C. E. Set up a weighted routing policy by using Amazon Route 53. Configure 10% of the traffic to go to the new Lambda function version.
D. B. Set up a new stage in API Gateway with a new Lambda function version. Enable weighted routing in API Gateway stages.
E. D. Set up a routing policy on a Network Load Balancer. Configure 10% of the traffic to go to the new Lambda function version.
Answer: A,B
Explanation:
Step 1: Understanding the Requirements
* Gradual Traffic Shift: Test the new version by routing only 10% of production traffic to it.
* Lambda Deployment: Use versioning and aliases to manage Lambda function updates.
Step 2: Solution Analysis
* Option A:
* Publishing a new version creates an immutable version of the Lambda function with the updated code.
* This is a prerequisite for deploying changes using weighted aliases.
* Correct option.
* Option B:
* API Gateway stages are not used for weighted routing; they represent environments like "dev" or
"prod."
* Weighted routing is implemented using Lambda aliases, not API Gateway stages.
* Not suitable.
* Option C:
* Lambda aliases allow traffic to be split between versions using weighted routing.
* Assign a 90% weight to the old version and 10% to the new version to implement the gradual rollout.
* Correct option.
* Option D:
* Network Load Balancers are not suitable for managing Lambda function traffic directly.
* Not applicable.
* Option E:
* Route 53 routing policies apply at the DNS level and are not designed for Lambda version management.
* Not suitable.
Step 3: Implementation Steps
* Publish a New Version:
* Publish the updated Lambda function code as a new version.
* Create an Alias and Configure Weighted Routing:
* Create an alias (e.g., prod) and associate it with both the old and new versions.
* Set weights for traffic distribution:
aws lambda update-alias --function-name my-function
--name prod --routing-config '{"AdditionalVersionWeights": {"2": 0.1}}' AWS Developer References:
* Lambda Function Aliases
* Weighted Traffic Routing with Lambda
NEW QUESTION # 112
A developer has code that is stored in an Amazon S3 bucket. The code must be deployed as an AWS Lambda function across multiple accounts in the same AWS Region as the S3 bucket an AWS CloudPormation template that runs for each account will deploy the Lambda function.
What is the MOST secure way to allow CloudFormaton to access the Lambda Code in the S3 bucket?
A. Grant the CloudFormation service role the S3 ListBucket and GetObject permissions. Add a bucket policy to Amazon S3 with the principal of "AWS" (account numbers)
B. Grant the CloudFormation service row the S3 GetObfect permission. Add a Bucket policy to Amazon S3 with the principal of "'"
C. Use a service-based link to grant the Lambda function the S3 GetObject permission Add a resource of
"** to allow access to the S3 bucket.
D. Use a service-based link to grant the Lambda function the S3 ListBucket and GetObject permissions by explicitly adding the S3 bucket's account number in the resource.
Answer: B
Explanation:
Explanation
This solution allows the CloudFormation service role to access the S3 bucket from any account, as long as it has the S3 GetObject permission. The bucket policy grants access to any principal with the GetObject permission, which is the least privilege needed to deploy the Lambda code. This is more secure than granting ListBucket permission, which is not required for deploying Lambda code, or using a service-based link, which is not supported for Lambda functions.
NEW QUESTION # 113
A developer is creating a stock trading application. The developer needs a solution to send text messages to application users to confirmation when a trade has been completed.
The solution must deliver messages in the order a user makes stock trades. The solution must not send duplicate messages.
Which solution will meet these requirements?
A. Configure the application to publish messages to an Amazon Data Firehose delivery stream. Configure the delivery stream to have a destination of each user's mobile phone number that is passed in the trade confirmation message.
B. Create an Amazon Simple Queue Service (Amazon SQS) FIFO queue. Use the SendMessageln API call to send the trade confirmation messages to the queue. Use the SendMessageOut API to send the messages to users by using the information provided in the trade confirmation message.
C. Configure a pipe in Amazon EventBridge Pipes. Connect the application to the pipe as a source.
Configure the pipe to use each user's mobile phone number as a target. Configure the pipe to send incoming events to the users.
D. Create an Amazon Simple Notification Service (SNS) FIFO topic. Configure the application to use the AWS SDK to publish notifications to the SNS topic to send SMS messages to the users.
Answer: C
NEW QUESTION # 114
A developer is writing a serverless application that requires an AWS Lambda function to be invoked every 10 minutes.
What is an automated and serverless way to invoke the function?
A. Create an Amazon Simple Notification Service (Amazon SNS) topic that has a subscription to the Lambda function with a 600-second timer.
B. Create an Amazon EventBridge rule that runs on a regular schedule to invoke the Lambda function.
C. Configure an environment variable named PERIOD for the Lambda function. Set the value to 600.
D. Deploy an Amazon EC2 instance based on Linux, and edit its /etc/confab file by adding a command to periodically invoke the lambda function
Answer: B
Explanation:
Explanation
The solution that will meet the requirements is to create an Amazon EventBridge rule that runs on a regular schedule to invoke the Lambda function. This way, the developer can use an automated and serverless way to invoke the function every 10 minutes. The developer can also use a cron expression or a rate expression to specify the schedule for the rule. The other options either involve using an Amazon EC2 instance, which is not serverless, or using environment variables or query parameters, which do not trigger the function.
NEW QUESTION # 115
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