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Amazon DVA-C02 (AWS Certified Developer - Associate) Certification Exam is designed for individuals who want to demonstrate their expertise in developing and maintaining applications on the Amazon Web Services (AWS) platform. AWS Certified Developer - Associate certification is ideal for software developers who are looking to enhance their skills in cloud computing and gain recognition for their proficiency in building applications on AWS. DVA-C02 Exam covers a wide range of topics such as AWS core services, AWS security, AWS database services, and AWS deployment and management.
Amazon AWS Certified Developer - Associate Sample Questions (Q93-Q98):
NEW QUESTION # 93
An application that is deployed to Amazon EC2 is using Amazon DynamoDB. The application calls the DynamoDB REST API. Periodically, the application receives a ProvisionedThroughputExceededException error when the application writes to a DynamoDB table.
Which solutions will mitigate this error MOST cost-effectively? (Choose two.)
- A. Modify the application code to perform exponential backoff when the error is received.
- B. Create a second DynamoDB table. Distribute the reads and writes between the two tables.
- C. Modify the application to use the AWS SDKs for DynamoDB.
- D. Increase the read and write throughput of the DynamoDB table.
- E. Create a DynamoDB Accelerator (DAX) cluster for the DynamoDB table.
Answer: A,C
Explanation:
Your request rate is too high. The AWS SDKs for DynamoDB automatically retry requests that receive this exception. Your request is eventually successful, unless your retry queue is too large to finish. Reduce the frequency of requests using Error Retries and Exponential Backoff.
NEW QUESTION # 94
A developer is creating a publicly accessible enterprise website consisting of only static assets.
The developer is hosting the website in Amazon S3 and serving the website to users through an Amazon CloudFront distribution. The users of this application must not be able to access the application content directly from an S3 bucket. All content must be served through the Amazon CloudFront distribution.
Which solution will meet these requirements?
- A. Update the S3 bucket settings. Enable the block all public access setting in Amazon S3.
Configure the CloudFront distribution's with Amazon S3 as the origin. Update the S3 bucket policy to allow CloudFront write access. - B. Update the CloudFront distribution's origin to send a custom header. Update the S3 bucket policy with a condition by using the aws:RequestTag/tag-key key. Configure the tag-key as the custom header name, and the value being matched is the header's value.
- C. Create a new origin access control (OAC) in CloudFront. Configure the CloudFront distribution's origin to use the new OAC. Update the S3 bucket policy to allow CloudFront OAC with read and write access to access Amazon S3 as the origin.
- D. Update the S3 bucket's static website settings. Enable static website hosting and specifying index and error documents. Update the CloudFront origin to use the S3 bucket's website endpoint.
Answer: D
NEW QUESTION # 95
A company notices that credentials that the company uses to connect to an external software as a service (SaaS) vendor are stored in a configuration file as plaintext.
The developer needs to secure the API credentials and enforce automatic credentials rotation on a quarterly basis.
Which solution will meet these requirements MOST securely?
- A. Retrieve temporary credentials from AWS Security Token Service (AWS STS) every 15 minutes.
Use the temporary credentials when users make API calls to the SaaS vendor. - B. Use AWS Key Management Service (AWS KMS) to encrypt the configuration file. Decrypt the configuration file when users make API calls to the SaaS vendor. Enable rotation.
- C. Store the credentials in AWS Secrets Manager and enable rotation. Configure the API to have Secrets Manager access.
- D. Store the credentials in AWS Systems Manager Parameter Store and enable rotation. Retrieve the credentials when users make API calls to the SaaS vendor.
Answer: C
NEW QUESTION # 96
A developer is working on a web application that uses Amazon DynamoDB as its data store The application has two DynamoDB tables one table that is named artists and one table that is named songs The artists table has artistName as the partition key. The songs table has songName as the partition key and artistName as the sort key The table usage patterns include the retrieval of multiple songs and artists in a single database operation from the webpage. The developer needs a way to retrieve this information with minimal network traffic and optimal application performance.
Which solution will meet these requirements'?
- A. Perform a BatchGetltem operation that returns items from the two tables. Use the list of songName artistName keys for the songs table and the list of artistName key for the artists table.
- B. Perform a Scan operation on each table that filters by the list of songName/artistName for the songs table and the list of artistName in the artists table.
- C. Perform a BatchGetltem operation on the songs table that uses the songName/artistName keys. Perform a BatchGetltem operation on the artists table that uses artistName as the key.
- D. Create a local secondary index (LSI) on the songs table that uses artistName as the partition key Perform a query operation for each artistName on the songs table that filters by the list of songName Perform a query operation for each artistName on the artists table
Answer: A
Explanation:
Scenario: Application needs to fetch songs and artists efficiently in a single operation.
BatchGetItem: This DynamoDB operation retrieves multiple items across different tables based on their primary keys in a single request.
Optimized for Request Batching: This approach reduces network traffic compared to performing multiple queries individually.
Data Modeling: The songs table is designed appropriately for this access pattern using artistName as the sort key.
Reference:
Amazon DynamoDB BatchGetItem: https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchGetItem.ht
NEW QUESTION # 97
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 developer's user permissions to include the S3:ListBucket permission for the S3 bucket.
- B. Update the IAM instance profile that is attached to the EC2 instance to include the S3:ListBucket permission for the S3 bucket.
- C. 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.
- D. Update the IAM instance profile that is attached to the EC2 instance to include the S3:* permission for the S3 bucket.
Answer: B
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 # 98
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