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Amazon AWS Certified Developer - Associate Sample Questions (Q98-Q103):

NEW QUESTION # 98
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 user data from http '169 254.169 254. latest/user-data/
B. Query
the Amazon Machine Image (AMI) information from http://169.254.169.254/latest/meta-data/ami/.
C. Check the hosts file of the operating system
D. Query the instance metadata from http./M69.254.169.254. latestmeta-data/.

Answer: D

Explanation:
Explanation
The
instance metadata service provides information about the EC2 instance, including the public IPv4 address, which can be obtained by querying the endpoint http://169.254.169.254/latest/meta-data/public-ipv4.
References
* Instance metadata and user data
* Get Public IP Address on current EC2 Instance
* Get the public ip address of your EC2 instance quickly

NEW QUESTION # 99
A company is using AWS CioudFormation 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 a cron daemon on the application s host to generate and rotate the password.
D. Use an AWS Lambda function as a CloudFormation custom resource to generate and rotate the password.

Answer: B

Explanation:
Explanation
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.
References: [AWS Secrets Manager], [AWS::SecretsManager::Secret]

NEW QUESTION # 100
A developer is working on an ecommerce platform that communicates with several third-party payment processing APIs. The third-party payment services do not provide a test environment.
The developer needs to validate the ecommerce platform's integration with the third-party payment processing APIs. The developer must test the API integration code without invoking the third-party payment processing APIs.
Which solution will meet these requirements?

A. Set up an AWS AppSync GraphQL API with a data source configured for each third-party API.
Specify an integration type of Mock. Configure integration responses by using sample responses captured from the real third-party API.
B. Set up an Amazon API Gateway REST API with a gateway response configured for status code
200. Add response templates that contain sample responses captured from the real third-party API.
C. Set up an Amazon API Gateway REST API for each third-party API. Specify an integration request type of Mock. Configure integration responses by using sample responses captured from the real third-party API.
D. Create an AWS Lambda function for each third-party API. Embed responses captured from the real third-party API. Configure Amazon Route 53 Resolver with an inbound endpoint for each Lambda function's Amazon Resource Name (ARN).

Answer: C

Explanation:
https://docs.aws.amazon.com/apigateway/latest/developerguide/how-to-mock-integration.html

NEW QUESTION # 101
A developer needs to migrate an online retail application to AWS to handle an anticipated increase in traffic.
The application currently runs on two servers: one server for the web application and another server for the database. The web server renders webpages and manages session state in memory. The database server hosts a MySQL database that contains order details. When traffic to the application is heavy, thememory usage for the web server approaches 100% and the application slows down considerably.
The developer has found that most of the memory increase and performance decrease is related to the load of managing additional user sessions. For the web server migration, the developer will use Amazon EC2 instances with an Auto Scaling group behind an Application Load Balancer.
Which additional set of changes should the developer make to the application to improve the application's performance?

A. Use an EC2 instance to host the MySQL database. Store the session data and the application data in the MySQL database.
B. Use Amazon ElastiCache for Memcached to store and manage the session data and the application data.
C. Use Amazon ElastiCache for Memcached to store and manage the session data. Use an Amazon RDS for MySQL DB instance to store the application data.
D. Use the EC2 instance store to manage the session data. Use an Amazon RDS for MySQL DB instance to store the application data.

Answer: C

Explanation:
Using Amazon ElastiCache for Memcached to store and manage the session data will reduce the memory load and improve the performance of the web server. Using Amazon RDS for MySQL DB instance to store the application data will provide a scalable, reliable, and managed database service. Option A is not optimal because it does not address the memory issue of the web server. Option C is not optimal because it does not provide a persistent storage for the application data. Option D is not optimal because it does not provide a high availability and durability for the session data.

NEW QUESTION # 102
A developer is troubleshooting an application that uses Amazon DynamoDB in the us-west-2 Region.
The application is deployed to an Amazon EC2 instance.
The application requires read- only permissions to a table that is named Cars.
The EC2 instance has an attached IAM role that contains the following IAM policy:

When the application tries to read from the Cars table, an Access Denied error occurs.
How can the developer resolve this error?

A. Create a trust policy that specifies the EC2 service principal. Associate the role with the policy.
B. Modify the IAM policy to include the dynamodb:* action.
C. Modify the IAM policy resource to be arn:aws:dynamodb:us-west-2:account-id:table/*?
D. Create a trust relationship between the role and dynamodb.amazonaws.com.

Answer: A

Explanation:
https://aws.amazon.com/blogs/security/how-to-use-trust-policies-with-iam-roles/

NEW QUESTION # 103
......

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