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AWS Certified Developer - Associate DVA-C02
AWS Certified Developer - Associate DVA-C02 Exam

An application is processing clickstream data using Amazon Kinesis. The clickstream data feed into Kinesis experiences periodic spikes. The PutRecords API call occasionally fails and the logs show that the failed call returns the response shown below:



Which techniques will help mitigate this exception? (Choose two.)

  1. Implement retries with exponential backoff.
  2. Use a PutRecord API instead of PutRecords.
  3. Reduce the frequency and/or size of the requests.
  4. Use Amazon SNS instead of Kinesis.
  5. Reduce the number of KCL consumers.

Answer(s): A,C

Explanation:

The request rate for the stream is too high, or the requested data is too large for the available throughput. Reduce the frequency or size of your requests. For more information, see Streams Limits in the Amazon Kinesis Data Streams Developer Guide, and Error Retries and Exponential Backoff in AWS in the AWS General Reference.


Reference:

https://aws.amazon.com/premiumsupport/knowledge-center/kinesis-data-stream-throttling-errors/



A company has an application that uses Amazon Cognito user pools as an identity provider. The company must secure access to user records. The company has set up multi-factor authentication (MFA). The company also wants to send a login activity notification by email every time a user logs in.

What is the MOST operationally efficient solution that meets this requirement?

  1. Create an AWS Lambda function that uses Amazon Simple Email Service (Amazon SES) to send the email notification. Add an Amazon API Gateway API to invoke the function. Call the API from the client side when login confirmation is received.
  2. Create an AWS Lambda function that uses Amazon Simple Email Service (Amazon SES) to send the email notification. Add an Amazon Cognito post authentication Lambda trigger for the function.
  3. Create an AWS Lambda function that uses Amazon Simple Email Service (Amazon SES) to send the email notification. Create an Amazon CloudWatch Logs log subscription filter to invoke the function based on the login status.
  4. Configure Amazon Cognito to stream all logs to Amazon Kinesis Data Firehose. Create an AWS Lambda function to process the streamed logs and to send the email notification based on the login status of each user.

Answer(s): B

Explanation:

Create an AWS Lambda function that uses Amazon Simple Email Service (Amazon SES) to send the email notification. Add an Amazon Cognito post authentication Lambda trigger for the function.

The most operationally efficient solution for sending login activity notifications by email for Amazon Cognito user pools is to use a Lambda trigger that is automatically invoked by Amazon Cognito every time a user logs in. This eliminates the need for client-side calls to an API or log subscription filter. A Lambda function can be used to send email notifications using Amazon SES.


Reference:

https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-lambda-post-authentication.html



A developer has an application that stores data in an Amazon S3 bucket. The application uses an HTTP API to store and retrieve objects.
When the PutObject API operation adds objects to the S3 bucket, the developer must encrypt these objects at rest by using server-side encryption with Amazon S3 managed keys (SSE-S3).

Which solution will meet this requirement?

  1. Create an AWS Key Management Service (AWS KMS) key. Assign the KMS key to the S3 bucket.
  2. Set the x-amz-server-side-encryption header when invoking the PutObject API operation.
  3. Provide the encryption key in the HTTP header of every request.
  4. Apply TLS to encrypt the traffic to the S3 bucket.

Answer(s): B

Explanation:

B. Set the x-amz-server-side-encryption header when invoking the PutObject API operation.

When using the PutObject API operation to store objects in an S3 bucket, the x-amz-server-side-encryption header can be set to specify the server-side encryption algorithm used to encrypt the object. Setting this header to "AES256" or "aws:kms" enables server-side encryption with SSE-S3 or SSE-KMS respectively.

Option A is incorrect because assigning a KMS key to the S3 bucket will not enable SSE-S3 encryption.

Option C is incorrect because providing the encryption key in the HTTP header of every request is not a valid way to enable SSE-S3 encryption.

Option D is incorrect because applying TLS encryption to the traffic to the S3 bucket only encrypts the data in transit, but does not encrypt the objects at rest in the bucket.


Reference:

https://docs.aws.amazon.com/AmazonS3/latest/userguide/UsingServerSideEncryption.html



A developer needs to perform geographic load testing of an API. The developer must deploy resources to multiple AWS Regions to support the load testing of the API.

How can the developer meet these requirements without additional application code?

  1. Create and deploy an AWS Lambda function in each desired Region. Configure the Lambda function to create a stack from an AWS CloudFormation template in that Region when the function is invoked.
  2. Create an AWS CloudFormation template that defines the load test resources. Use the AWS CLI create-stack-set command to create a stack set in the desired Regions.
  3. Create an AWS Systems Manager document that defines the resources. Use the document to create the resources in the desired Regions.
  4. Create an AWS CloudFormation template that defines the load test resources. Use the AWS CLI deploy command to create a stack from the template in each Region.

Answer(s): B

Explanation:

B. Create an AWS CloudFormation template that defines the load test resources. Use the AWS CLI create-stack-set command to create a stack set in the desired Regions.

AWS CloudFormation StackSets allow developers to deploy CloudFormation stacks across multiple AWS accounts and regions with a single CloudFormation template. By using the AWS CLI create-stack-set command, the developer can deploy the same CloudFormation stack to multiple regions without additional application code, thereby meeting the requirement for geographic load testing of an API.


Reference:

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/stacksets-concepts.html https://awscli.amazonaws.com/v2/documentation/api/2.1.30/reference/cloudformation/create-stack-set.html




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