Question 1

A developer wants the ability to roll back to a previous version of an AWS Lambda function in the event of errors caused by a new deployment. How can the developer achieve this with MINIMAL impact on users?

Options :

A :

Change the application to use an alias that points to the current version. Deploy the new version of the code Update the alias to use the newly deployed version. If too many errors are encountered, point the alias back to the previous version.

B :

Change the application to use an alias that points to the current version. Deploy the new version of the code. Update the alias to direct 10% of users to the newly deployed version. If too many errors are encountered, send 100% of traffic to the previous version

C :

Do not make any changes to the application. Deploy the new version of the code. If too many errors are encountered, point the application back to the previous version using the version number in the Amazon Resource Name (ARN).

D :

Create three aliases: new, existing, and router. Point the existing alias to the current version. Have the router alias direct 100% of users to the existing alias. Update the application to use the router alias. Deploy the new version of the code. Point the new alias to this version. Update the router alias to direct 10% of users to the new alias. If too many errors are encountered, send 100% of traffic to the existing alias.

Answer: A

Question 2

A developer built an application by using multiple AWS Lambda functions. The Lambda functions must access dynamic configuration data at runtime. The data is maintained as a 6 KB JSON document in AWS AppConfig. The configuration data needs to be updated without requiring the redeployment of the application.

The developer needs a solution that will give the Lambda functions access to the dynamic configuration data.

What should the developer do to meet these requirements with the LEAST development effort?

Options :

A : Migrate the document from AWS AppConfig to a Lambda environment variable. Read the document at the runtime.

B : Configure the AWS AppConfig Agent Lambda extension. Access the dynamic configuration data by calling the extension on a local host.

C : Use the AWS X-Ray SDK to call the AWS AppConfig APIs. Retrieve the configuration file at runtime.

D : Migrate the configuration file to a Lambda deployment package. Read the file from the file system at runtime.

Answer: B

Question 3

A developer is using AWS CodeBuild to build an application into a Docker image. The buildspec file is used to run the application build. The developer needs to push the Docker image to an Amazon ECR repository only upon the successful completion of each build.

Options :

A : Add an install phase to the buildspec file that uses the commands block to push the Docker image.

B : Add a post_build phase to the buildspec file that uses the artifacts sequence to find the build artifacts and push to Amazon ECR.

C : Add a post_build phase to the buildspec file that uses the finally block to push the Docker image.

D : Add a post_build phase to the buildspec file that uses the commands block to push the Docker image.

Answer: D

Question 4

A Developer is using AWS SAM to create a template for deploying a serverless application. The Developer plans to leverage an application from the AWS Serverless Application Repository in the template as a nested application.

Which resource type should the Developer specify?

Options :

A : AWS::Serverless:SimpleTable

B : AWS::Serverless::Application

C : AWS::Serverless:HttpApi

D : AWS::Serverless:Function

Answer: B

Question 5

A developer is updating an Amazon Aurora MySQL database to allow more clients to connect. What database parameter needs to be updated to support a higher number of client connections?

Options :

A : max_allowed_packet

B : max_connections

C : max_join_size

D : max_user_connections

Answer: B

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