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Amazon AWS Certified Developer - Associate Sample Questions (Q400-Q405):

NEW QUESTION # 400
An application that is hosted on an Amazon EC2 instance needs access to files that are stored in an Amazon S3 bucket. The application lists the objects that are stored in the S3 bucket and displays a table to the user. During testing, a developer discovers that the application does not show any objects in the list.
What is the MOST secure way to resolve this issue?

A. Update the IAM instance profile that is attached to the EC2 instance to include the S3:* permission for the S3 bucket.
B. Update the S3 bucket policy by including the S3:ListBucket permission and by setting the Principal element to specify the account number of the EC2 instance.
C. Update the IAM instance profile that is attached to the EC2 instance to include the S3:ListBucket permission for the S3 bucket.
D. Update the developer's user permissions to include the S3:ListBucket permission for the S3 bucket.

Answer: C

Explanation:
IAM instance profiles are containers for IAM roles that can be associated with EC2 instances. An IAM role is a set of permissions that grant access to AWS resources. An IAM role can be used to allow an EC2 instance to access an S3 bucket by including the appropriate permissions in the role's policy. The S3:ListBucket permission allows listing the objects in an S3 bucket. By updating the IAM instance profile with this permission, the application on the EC2 instance can retrieve the objects from the S3 bucket and display them to the user. Reference: Using an IAM role to grant permissions to applications running on Amazon EC2 instances

NEW QUESTION # 401
A developer has an application that uses an Amazon DynamoDB table with a configured local secondary index (LSI). During application testing, the DynamoDB table metrics report a ProvisionedThroughputExceededException error message. The number of requests made by the test suite did not exceed the table's provisioned capacity limits.
What is the cause of this issue?

A. The data in the table's partition key column is not evenly distributed.
B. The application is not implementing exponential backoff retry logic while interacting with the DynamoDB API.
C. The application has the IAM permission to query the DynamoDB table but not to query the LSI.
D. The LSI's capacity is different from the table's capacity.

Answer: A

NEW QUESTION # 402
A company developed an API application on AWS by using Amazon CloudFront, Amazon API Gateway, and AWS Lambda. The API has a minimum of four requests every second. A developer notices that many API users run the same query by using the POST method. The developer wants to cache the POST request to optimize the API resources.
Which solution will meet these requirements?

A. Save the latest request response in Lambda /tmp directory. Update the Lambda function to check the
/tmp directory.
B. Save the latest request in AWS Systems Manager Parameter Store. Modify the Lambda function to take the latest request response from Parameter Store.
C. Override the cache method in the selected stage of API Gateway. Select the POST method.
D. Configure the CloudFront cache. Update the application to return cached content based upon the default request headers.

Answer: C

Explanation:
Explanation
Amazon API Gateway provides tools for creating and documenting web APIs that route HTTP requests to Lambda functions2. You can secure access to your API with authentication and authorization controls. Your APIs can serve traffic over the internet or can be accessible only within your VPC2. You can override the cache method in the selected stage of API Gateway2. Therefore, option B is correct.

NEW QUESTION # 403
A developer is creating a mobile application that will not require users to log in.
What is the MOST efficient method to grant users access to AWS resources'?

A. Create an AWS Lambda function to create an 1AM user when a user accesses the application.
B. Use Amazon Cognito to associate unauthenticated users with an IAM role that has limited access to resources.
C. Create credentials using AWS KMS and apply these credentials to users when using the application.
D. Use an identity provider to securely authenticate with the application.

Answer: B

Explanation:
Explanation
This solution is the most efficient method to grant users access to AWS resources without requiring them to log in. Amazon Cognito is a service that provides user sign-up, sign-in, and access control for web and mobile applications. Amazon Cognito identity pools support both authenticated and unauthenticated users.
Unauthenticated users receive access to your AWS resources even if they aren't logged in with any of your identity providers (IdPs). You can use Amazon Cognito to associate unauthenticated users with an IAM role that has limited access to resources, such as Amazon S3 buckets or DynamoDB tables. This degree of access is useful to display content to users before they log in or to allow them to perform certain actions without signing up. Using an identity provider to securely authenticate with the application will require users to log in, which does not meet the requirement. Creating an AWS Lambda function to create an IAM user when a user accesses the application will incur unnecessary costs and complexity, and may pose security risks if not implemented properly. Creating credentials using AWS KMS and applying them to users when using the application will also incur unnecessary costs and complexity, and may not provide fine-grained access control for resources.

NEW QUESTION # 404
A gaming application stores scores for players in an Amazon DynamoDB table that has four attributes: user_id, user_name, user_score, and user_rank. The users are allowed to update their names only. A user is authenticated by web identity federation.
Which set of conditions should be added in the policy attached to the role for the dynamodb:PutItem API call?

A. "Condition": {
"ForAllValues:StringEquals": {
"dynamodb:LeadingKeys": ["${www.amazon.com:user_id}"], "dynamodb:Attributes": ["user_name",
"user_id"]
}
}
B. "Condition": {
"ForAllValues:StringEquals": {
"dynamodb:LeadingKeys": ["${www.amazon.com:user_id}"], "dynamodb:Attributes": ["user_name"]
}
}
C. "Condition": {
"ForAllValues:StringEquals": {
"dynamodb:LeadingKeys": ["${www.amazon.com:user_name}"], "dynamodb:Attributes": ["user_id"]
}
}
D. "Condition": {
"ForAllValues:StringEquals": {
"dynamodb:LeadingKeys": ["${www.amazon.com:user_name}"], "dynamodb:Attributes":
["username", "userid"]
}
}

Answer: B

Explanation:
The LeadingKeys condition restricts operations to the authenticated user's user_id. The Attributes condition limits the updatable attributes to user_name.

NEW QUESTION # 405
......

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