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NEW QUESTION 26
A company needs to distribute firmware updates to its customers around the world.
Which service will allow easy and secure control of the access to the downloads at the lowest cost?

  • A. Create a dedicated Amazon CloudFront Distribution for each customer
  • B. Use Amazon CloudFront with signed URLs for Amazon S3
  • C. Use Amazon API Gateway and AWS Lambda to control access to an S3 bucket
  • D. Use Amazon CloudFront with AWS Lambda@Edge

Answer: B

Explanation:
Explanation
https://aws.amazon.com/blogs/networking-and-content-delivery/amazon-s3-amazon-cloudfront-a-match-made-in

 

NEW QUESTION 27
An e-commerce site allows returning users to log in to display customized web pages. The workflow is shown in the image below:

An application is running on EC2 instances. Amazon RDS is used for the database that stores user accounts and preferences. The website freezes or is slow to load while waiting for the login step to complete. The remaining components of the site are well-optimized.
Which of the following techniques will resolve this issue? (Select Two.)

  • A. Use Amazon ElastiCache for MemCached to cache user data.
  • B. Batch login requests from hundreds of users together as a single read request to the database.
  • C. Implement the user login page as an asynchronous Lambda function.
  • D. Call the database asynchronously so the code can continue executing.
  • E. Use Amazon Application Load Balancer to load balance the traffic to the website.

Answer: A,D

Explanation:
https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/making-asynchronous- calls.html

 

NEW QUESTION 28
A Developer is creating a Lambda function and will be using external libraries that are not included in the standard Lambda libraries.
What action would minimize the Lambda compute time consumed?

  • A. Create a Lambda deployment package that includes the external libraries.
  • B. Copy the external libraries to Amazon S3, and reference the external libraries to the S3 location.
  • C. Install the external libraries in Lambda to be available to all Lambda functions.
  • D. Install the dependencies and external libraries at the beginning of the Lambda function.

Answer: A

Explanation:
https://docs.aws.amazon.com/lambda/latest/dg/deployment-package-v2.html

 

NEW QUESTION 29
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. Create a second DynamoDB table. Distribute the reads and writes between two tables.
  • B. Modify the application to use the AWS SDKs for DynamoDB.
  • C. Increase the read and write throughput of the DynamoDB table.
  • D. Create a DynamoDB Accelerator (DAX) cluster for the DynamoDB table.
  • E. Modify the application code to perform exponential backoff when the error is received.

Answer: B,E

Explanation:
Expalantion:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ Programming.Errors.html

 

NEW QUESTION 30
A developer receives the following error message when trying to launch or terminate an Amazon EC2 instance using a boto3 script.

What should the developer do to correct this error message?

  • A. Assign an IAM role to the EC2 instance to allow necessary API calls on behalf of the client.
  • B. Upgrade to the latest AWS CLI version so that boto3 can handle higher request rates
  • C. Increase the overall network bandwidth to handle higher API request rates.
  • D. Implement an exponential backoff algorithm for optimizing the number of API requests made to Amazon EC2.

Answer: B

 

NEW QUESTION 31
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