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Amazon AWS Certified Developer - Associate Sample Questions (Q140-Q145):

NEW QUESTION # 140
A company has a social media application that receives large amounts of traffic User posts and interactions are continuously updated in an Amazon RDS database The data changes frequently, and the data types can be complex The application must serve read requests with minimal latency The application's current architecture struggles to deliver these rapid data updates efficiently The company needs a solution to improve the application's performance.
Which solution will meet these requirements'?

A. Add an Amazon CloudFront distribution in front of the RDS database to provide a caching layer for the high volume of rapidly changing data
B. Set up Amazon S3 Transfer Acceleration on the RDS database to enhance the speed of data transfer from the databases to the application.
C. Create an Amazon ElastiCache for Redis cluster. Update the application code to use a write-through caching strategy and read the data from Redis.
D. Use Amazon DynamoDB Accelerator (DAX) in front of the RDS database to provide a caching layer for the high volume of rapidly changing data

Answer: C

NEW QUESTION # 141
A developer deployed an application to an Amazon EC2 instance The application needs to know the public IPv4 address of the instance How can the application find this information?

A. Query the instance metadata from http./M69.254.169.254. latestmeta-data/.
B. Query the instance user data from http '169 254.169 254. latest/user-data/
C. Check the hosts file of the operating system
D. Query
the Amazon Machine Image (AMI) information from http://169.254.169.254/latest/meta-data/ami/.

Answer: A

Explanation:
* Instance Metadata Service: EC2 instances have access to an internal metadata service. It provides instance-specific information like instance ID, security groups, and public IP address.
* Accessing Metadata:
* Make an HTTP GET request to the base URL: http://169.254.169.254/latest/meta-data/
* You'll get a list of available categories. The public IPv4 address is under public-ipv4.

NEW QUESTION # 142
A company deploys a photo-processing application to an Amazon EC2 instance. The application needs to process each photo in less than 5 seconds. If processing takes longer than 5 seconds, the company's development team must receive a notification.
How can a developer implement the required time measurement and notification with the LEAST operational overhead?

A. Create an Amazon Kinesis data stream. Each time a photo is processed, publish the processing time to the data stream. Create an Amazon CloudWatch alarm that enters ALARM state if any values are more than 5 seconds. Notify the development team by using an Amazon Simple Notification Service (Amazon SNS) topic.
B. Create an Amazon CloudWatch custom metric. Each time a photo is processed, publish the processing time as a metric value. Create a CloudWatch alarm that enters ALARM state if the average of values is greater than 5 seconds. Notify the development team by sending an Amazon Simple Email Service (Amazon SES) message.
C. Create an Amazon CloudWatch custom metric. Each time a photo is processed, publish the processing time as a metric value. Create a CloudWatch alarm that is based on a static threshold of 5 seconds. Notify the development team by using an Amazon Simple Notification Service (Amazon SNS) topic.
D. Create an Amazon Simple Queue Service (Amazon SQS) queue. Each time a photo is processed, publish the processing time to the queue. Create an application to consume from the queue and to determine whether any values are more than 5 seconds. Notify the development team by using an Amazon Simple Notification Service (Amazon SNS) topic.

Answer: C

NEW QUESTION # 143
A developer designed an application on an Amazon EC2 instance The application makes API requests to objects in an Amazon S3 bucket Which combination of steps will ensure that the application makes the API requests in the MOST secure manner? (Select TWO.)

A. Create an IAM role that has permissions to the S3 bucket
B. Create an IAM user that has permissions to the S3 bucket. Add the user to an 1AM group
C. Add the IAM role to an instance profile. Attach the instance profile to the EC2 instance.
D. Create an 1AM role that has permissions to the S3 bucket Assign the role to an 1AM group
E. Store the credentials of the IAM user in the environment variables on the EC2 instance

Answer: A,C

Explanation:
IAM Roles for EC2: IAM roles are the recommended way to provide AWS credentials to applications running on EC2 instances. Here's how this works:
You create an IAM role with the necessary permissions to access the target S3 bucket.
You create an instance profile and associate the IAM role with this profile.
When launching the EC2 instance, you attach this instance profile.
Temporary Security Credentials: When the application on the EC2 instance needs to access S3, it doesn't directly use access keys. Instead, the AWS SDK running on the instance retrieves temporary security credentials associated with the role. These are rotated automatically by AWS.
Reference:
IAM Roles for Amazon EC2: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_switch-role-ec2.html Temporary Security Credentials: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp.html

NEW QUESTION # 144
A company created an application to consume and process data. The application uses Amazon SQS and AWS Lambda functions. The application is currently working as expected, but it occasionally receives several messages that it cannot process properly. The company needs to clear these messages to prevent the queue from becoming blocked. A developer must implement a solution that makesqueue processing always operational. The solution must give the company the ability to defer the messages with errors and save these messages for further analysis. What is the MOST operationally efficient solution that meets these requirements?

A. Configure Amazon CloudWatch Logs to save the error messages to a separate log stream.
B. Change the SQS queue to a FIFO queue. Configure the message retention period to 0 seconds.
C. Configure an Amazon CloudWatch alarm for Lambda function errors. Publish messages to an Amazon SNS topic to notify administrator users.
D. Create a new SQS queue. Set the new queue as a dead-letter queue for the application queue. Configure the Maximum Receives setting.

Answer: D

Explanation:
Using a dead-letter queue (DLQ) with Amazon SQS is the most operationally efficient solution for handling unprocessable messages.
* Amazon SQS Dead-Letter Queue:
* A DLQ is used to capture messages that fail processing after a specified number of attempts.
* Allows the application to continue processing other messages without being blocked.
* Messages in the DLQ can be analyzed later for debugging and resolution.
* Why DLQ is the Best Option:
* Operational Efficiency: Automatically defers messages with errors, ensuring the queue is not blocked.
* Analysis Ready: Messages in the DLQ can be inspected to identify recurring issues.
* Scalable: Works seamlessly with Lambda and SQS at scale.
* Why Not Other Options:
* Option A: Logs the messages but does not resolve the queue blockage issue.
* Option C: FIFO queues and 0-second retention do not provide error handling or analysis capabilities.
* Option D: Alerts administrators but does not handle or store the unprocessable messages.
Steps to Implement:
* Create a new SQS queue to serve as the DLQ.
* Attach the DLQ to the primary queue and configure the Maximum Receives setting.

NEW QUESTION # 145
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