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최신 AWS Certified Associate DVA-C02 무료샘플문제 (Q415-Q420):

질문 # 415
A developer is deploying a company's application to Amazon EC2 instances The application generates gigabytes of data files each day The files are rarely accessed but the files must be available to the application's users within minutes of a request during the first year of storage The company must retain the files for 7 years.
How can the developer implement the application to meet these requirements MOST cost-effectively?

A. Store the files on an Amazon Elastic File System (Amazon EFS) mount. Configure EFS lifecycle management to transition the files to the EFS Standard-Infrequent Access (Standard-IA) storage class after 1 year.
B. Store the files on an Amazon Elastic Block Store (Amazon EBS) volume Use Amazon Data Lifecycle Manager (Amazon DLM) to create snapshots of the EBS volumes and to store those snapshots in Amazon S3
C. Store the files in an Amazon S3 bucket Use the S3 Glacier Instant Retrieval storage class Create an S3 Lifecycle policy to transition the files to the S3 Glacier Deep Archive storage class after 1 year
D. Store the files in an Amazon S3 bucket. Use the S3 Standard storage class. Create an S3 Lifecycle policy to transition the files to the S3 Glacier Flexible Retrieval storage class after 1 year.

정답：C

설명：
Explanation
Amazon S3 Glacier Instant Retrieval is an archive storage class that delivers the lowest-cost storage for long-lived data that is rarely accessed and requires retrieval in milliseconds. With S3 Glacier Instant Retrieval, you can save up to 68% on storage costs compared to using the S3 Standard-Infrequent Access (S3 Standard-IA) storage class, when your data is accessed once per quarter.
https://aws.amazon.com/s3/storage-classes/glacier/instant-retrieval/

질문 # 416
A developer has an application that stores data in an Amazon S3 bucket. The application uses an HTTP API to store and retrieve objects. When the PutObject API operation adds objects to the S3 bucket the developer must encrypt these objects at rest by using server-side encryption with Amazon S3 managed keys (SSE-S3).
Which solution will meet this requirement?

A. Apply TLS to encrypt the traffic to the S3 bucket.
B. Create an AWS Key Management Service (AWS KMS) key. Assign the KMS key to the S3 bucket.
C. Set the x-amz-server-side-encryption header when invoking the PutObject API operation.
D. Provide the encryption key in the HTTP header of every request.

정답：C

설명：
Explanation
Amazon S3 supports server-side encryption, which encrypts data at rest on the server that stores the data. One of the encryption options is SSE-S3, which uses keys managed by S3. To use SSE-S3, the x-amz-server-side-encryption header must be set to AES256 when invoking the PutObject API operation. This instructs S3 to encrypt the object data with SSE-S3 before saving it on disks in its data centers and decrypt it when it is downloaded. Reference: Protecting data using server-side encryption with Amazon S3-managed encryption keys (SSE-S3)

질문 # 417
A developer is storing sensitive data generated by an application in Amazon S3. The developer wants to encrypt the data at rest. A company policy requires an audit trail of when the AWS Key Management Service (AWS KMS) key was used and by whom.
Which encryption option will meet these requirements?

A. Server-side encryption with customer-provided keys (SSE-C)
B. Server-side encryption with self-managed keys
C. Server-side encryption with Amazon S3 managed keys (SSE-S3)
D. Server-side encryption with AWS KMS managed keys (SSE-KMS)

정답：D

설명：
KMS provides audit functionalities.

질문 # 418
A company is using AWS CloudFormation to deploy a two-tier application. The application will use Amazon RDS as its backend database. The company wants a solution that will randomly generate the database password during deployment. The solution also must automatically rotate the database password without requiring changes to the application.
What is the MOST operationally efficient solution that meets these requirements'?

A. Use an AWS Systems Manager Parameter Store resource with the SecureString data type to generate and rotate the password.
B. Use an AWS Secrets Manager resource to generate and rotate the password.
C. Use an AWS Lambda function as a CloudFormation custom resource to generate and rotate the password.
D. Use a cron daemon on the application s host to generate and rotate the password.

정답：B

설명：
This solution will meet the requirements by using AWS Secrets Manager, which is a service that helps protect secrets such as database credentials by encrypting them with AWS Key Management Service (AWS KMS) and enabling automatic rotation of secrets. The developer can use an AWS Secrets Manager resource in AWS CloudFormation template, which enables creating and managing secrets as part of a CloudFormation stack. The developer can use an AWS::SecretsManager::Secret resource type to generate and rotate the password for accessing RDS database during deployment. The developer can also specify a RotationSchedule property for the secret resource, which defines how often to rotate the secret and which Lambda function to use for rotation logic. Option A is not optimal because it will use an AWS Lambda function as a CloudFormation custom resource, which may introduce additional complexity and overhead for creating and managing a custom resource and implementing rotation logic. Option B is not optimal because it will use an AWS Systems Manager Parameter Store resource with the SecureString data type, which does not support automatic rotation of secrets. Option C is not optimal because it will use a cron daemon on the application's host to generate and rotate the password, which may incur more costs and require more maintenance for running and securing a host.

질문 # 419
A developer wants to create an AWS Lambda function to handle a queue of tasks that write data to Amazon DynamoDB when the tasks are processed. The developer must implement a solution that uses Amazon SQS to process the tasks one at a time and in order. Which solution will meet these requirements?

A. Set the maximum concurrency of the Lambda function to 1 Subscribe the Lambda function to an SQS FIFO queue. Use a different group ID for each message.
B. Set the provisioned concurrency of the Lambda function to 1. Subscribe the Lambda function to an SQS FIFO queue. Use the same group ID for all messages.
C. Set the maximum concurrency of the Lambda function to 1. Subscribe the Lambda function to an SQS standard queue. Do not use a group ID for the messages.
D. Set the maximum concurrency of the Lambda function to 1 Subscribe the Lambda function to an SQS FIFO queue. Use the same group ID for all messages.

정답：D

설명：
To process messages one at a time and in order, use an SQS FIFO queue with a single message group ID (ensures strict order). By setting the maximum concurrency of the Lambda function to 1, only one message is processed at a time, preserving order and avoiding parallel execution.

질문 # 420
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