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NEW QUESTION 51
Company C has recently launched an online commerce site for bicycles on AWS. They have a “Product” DynamoDB table that stores details for each bicycle, such as, manufacturer, color, price, quantity and size to display in the online store. Due to customer demand, they want to include an image for each bicycle along with the existing details.
Which approach below provides the least impact to provisioned throughput on the “Product” table?

  • A. Serialize the image and store it in multiple DynamoDB tables
  • B. Create an “Images” DynamoDB table to store the Image with a foreign key constraint to the “Product” table
  • C. Add an image data type to the “Product” table to store the images in binary format
  • D. Store the images in Amazon S3 and add an S3 URL pointer to the “Product” table item for each image

Answer: D

 

NEW QUESTION 52
A Developer is receiving HTTP 400: ThrottlingException errors intermittently when calling the Amazon CloudWatch API. When a call fails, no data is retrieved.
What best practice should first be applied to address this issue?

  • A. Analyze the applications and remove the API call
  • B. Use the AWS CLI to get the metrics
  • C. Retry the call with exponential backoff
  • D. Contact AWS Support for a limit increase.

Answer: C

Explanation:
Explanation
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_limits.html

 

NEW QUESTION 53
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. Use Amazon Cognito to associate unauthenticated users with an IAM role that has limited access to resources.
  • B. Create credentials using AWS KMS and apply these credentials to users when using the application.
  • C. Use an identity provider to securely authenticate with the application.
  • D. Create an AWS Lambda function to create an IAM user when a user accesses the application.

Answer: B

 

NEW QUESTION 54
A Developer has implemented a Lambda function that needs to add new customers to an RDS database that is expected to run hundreds of times per hour. The Lambda function is configured to use 512MB of RAM and is based on the following pseudo code:

After testing the Lambda function, the Developer notices that the Lambda execution time is much longer than expected. What should the Developer do to improve performance?

  • A. Replace RDS wit Amazon DynamoDB to implement control over the number of writes per second.
  • B. Increase the size of the RDS database to allow for an increased number of database connections each hour.
  • C. Increase the amount of RAM allocated to the Lambda function, which will increase the number of threads the Lambda can use.
  • D. Move the database connection and close statement out of the handler. Place the connection in the global space.

Answer: D

Explanation:
Explanation
Refer AWS documentation – Lambda Best Practices
Take advantage of Execution Context reuse to improve the performance of your function. Make sure any externalized configuration or dependencies that your code retrieves are stored and referenced locally after initial execution. Limit the re-initialization of variables/objects on every invocation. Instead use static initialization/constructor, global/static variables and singletons. Keep alive and reuse connections (HTTP, database, etc.) that were established during a previous invocation.

 

NEW QUESTION 55
An application running on EC2 instances is storing data in an S3 bucket. Security policy mandates that all data must be encrypted in transit.
How can the Developer ensure that all traffic to the S3 bucket is encrypted?

  • A. Create an HTTPS redirect on the EC2 instances.
  • B. Create a bucket policy that denies traffic where SecureTransport is false.
  • C. Create a bucket policy that allows traffic where SecureTransport is true.
  • D. Install certificates on the EC2 instances.

Answer: B

Explanation:
Explanation
https://aws.amazon.com/blogs/security/how-to-use-bucket-policies-and-apply-defense-in-depth-to-help-secure-y

 

NEW QUESTION 56
……

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