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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Security | 26% | - Implement authentication and authorization
|
| Topic 2: Troubleshooting and Optimization | 18% | - Debug and resolve errors
|
| Topic 3: Deployment | 24% | - Prepare application artifacts for deployment
|
| Topic 4: Development with AWS Services | 32% | - Write code for applications hosted on AWS
|
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問題 #794
A company has an application that uses an Amazon S3 bucket for object storage. A developer needs to configure in-transit encryption for the S3 bucket. All the S3 objects containing personal data needs to be encrypted at rest with AWS KMS keys, which can be rotated on demand.
Which combination of steps will meet these requirements? (Select TWO.)
答案：A,E
解題說明：
Step-by-Step Breakdown:
Requirement Summary:
* In-transit encryption (when data is moving between client and S3)
* Encryption at rest using AWS KMS keys (which are rotatable on-demand) Option A: Write an S3 bucket policy to allow only encrypted connections over HTTPS by using permissions boundary
* Incorrect: Permissions boundaries are for IAM policy control, not S3 bucket policies.
* Also, encryption enforcement in-transit is not achieved through permissions boundaries.
Option B: Configure an S3 bucket policy to enable client-side encryption
* Incorrect: AWS does not enforce client-side encryption via S3 bucket policies.
* Client-side encryption must be handled entirely by the application.
* Also, KMS is for server-side encryption, not client-side.
Option C: Configure the application to encrypt the objects by using an AWS KMS customer managed key before uploading the objects
* Correct: This fulfills the requirement of encrypting objects at rest using a KMS CMK, which can be rotated.
* You can specify the KMS key using the SSE-KMS option when putting an object.
Option D: Write an S3 bucket policy to allow only encrypted connections over HTTPS by using the aws:
SecureTransport condition
* Correct: This enforces in-transit encryption, which ensures that only HTTPS connections are allowed.
* This is the AWS-recommended way to enforce encryption in transit via bucket policy.
Option E: Configure S3 Block Public Access settings for the S3 bucket to allow only encrypted connections over HTTPS
* Incorrect: Block Public Access is used to prevent public exposure of the bucket.
* It has nothing to do with encryption enforcement, whether in transit or at rest.
* Using SSE-KMS: https://docs.aws.amazon.com/AmazonS3/latest/userguide/UsingKMSEncryption.html
* aws:SecureTransport condition in bucket policies: https://docs.aws.amazon.com/AmazonS3/latest
/userguide/amazon-s3-policy-keys.html
* Server-side encryption with AWS KMS: https://docs.aws.amazon.com/AmazonS3/latest/userguide/serv- side-encryption.html
問題 #795
A developer is testing a Python application that is deployed on AWS Elastic Beanstalk. The application is using the Boto3 library to send events to an Amazon SQS queue. An external tool consumes the events.
During the tests, a ThrottlingException error occurs at irregular intervals.
What should the developer do to resolve this error?
答案：A
解題說明：
A ThrottlingException indicates that calls to an AWS service are being rate limited. The correct developer response is to use SDK retry behavior with backoff rather than scaling the application servers blindly. Boto3 supports retry modes, including adaptive retry mode, which adjusts client-side request rates based on throttling errors, exceptions, or HTTP status codes returned by AWS services. Increasing Elastic Beanstalk instance count or size can actually worsen throttling by producing more calls to SQS. Changing programming language is irrelevant. Adaptive retry mode is specifically intended to handle throttling more gracefully by slowing requests and retrying failed API calls. AWS SDK documentation describes adaptive retry mode as modifying rate-limit variables based on error responses and using those variables to calculate the next call rate. ( AWS Documentation )
問題 #796
A company has a new application. The company needs to secure sensitive configuration data such as database connection strings, application license codes, and API keys that the application uses to access external resources. The company must track access to the configuration data for auditing purposes. The resources are managed outside the application.
The company is not required to manage rotation of the connection strings, license codes, and API keys in the application. The company must implement a solution to securely store the configuration data and to give the application access to the configuration data. The solution must comply with security best practices.
Which solution will meet these requirements MOST cost-effectively?
答案：A
解題說明：
https://aws.amazon.com/blogs/mt/the-right-way-to-store-secrets-using-parameter-store/
https://docs.aws.amazon.com/managedservices/latest/userguide/sys-man-param-store.html AWS Systems Manager Parameter Store (AMS SSPS):
AWS Systems Manager Parameter Store provides secure, hierarchical storage for configuration data management and secrets management. You can store data such as passwords, database strings, and license codes as parameter values.
問題 #797
A developer wants to use an Amazon CloudFront distribution to deliver a web application to users. Users will access the application through the internet.
The developer needs to create an SSL/TLS certificate to use with the CloudFront distribution. The developer wants to minimize operational overhead by ensuring that the certificate is renewed automatically.
Which solution will meet these requirements?
答案：D
解題說明：
Using AWS Certificate Manager (ACM) with DNS validation for a public certificate enables automatic renewal and is fully compatible with Amazon CloudFront. This approach minimizes operational overhead because ACM handles the entire lifecycle of the certificate, including renewals and deployment to CloudFront.
問題 #798
A developer is building an application that consists of many AWS Lambda functions. The Lambda functions connect to a single Amazon RDS database.
The developer needs to implement a solution to store the database credentials securely. When the credentials are updated, the Lambda functions must be able to use the new credentials without requiring a code update or a configuration update.
Which solution will meet these requirements?
答案：A
解題說明：
AWS Secrets Manager is specifically designed to securely store and manage sensitive information, such as database credentials. You can store the credentials as a secret and access them dynamically at runtime from within your Lambda functions. Secrets Manager also supports automatic rotation of secrets, so when the credentials are updated, the Lambda functions can access the updated credentials without needing a code or configuration update. This is the best solution for managing credentials securely and allowing Lambda functions to access them with minimal operational overhead.
問題 #799
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