Question 1

A legacy service has an XML-based SOAP interface. The Developer wants to expose the functionality of the service to external clients with the Amazon API Gateway. Which technique will accomplish this?
A) Create a RESTful API with the API Gateway; transform the incoming JSON into a valid XML message for the SOAP interface using mapping templates.
B) Create a RESTful API with the API Gateway; pass the incoming JSON to the SOAP interface through an Application Load Balancer.
C) Create a SOAP API with the API Gateway; pass the incoming XML to the SOAP interface through an Application Load Balancer.
D) Create a SOAP API with the API Gateway; transform the incoming XML into a valid message for the SOAP interface using mapping templates.

Accepted Answer

The answer of A legacy service has an XML-based SOAP...

Question 2

A Developer has written an application that runs on Amazon EC2 instances and generates a value every minute. The Developer wants to monitor and graph the values generated over time without logging in to the instance each time. Which approach should the Developer use to achieve this goal?
A) Use the Amazon CloudWatch metrics reported by default for all EC2 instances. View each value from the CloudWatch console.
B) Develop the application to store each value in a file on Amazon S3 every minute with the timestamp as the name.
C) Publish each generated value as a custom metric to Amazon CloudWatch using available AWS SDKs.
D) Store each value as a variable and add the variable to the list of EC2 metrics that should be reported to the Amazon CloudWatch console.

Accepted Answer

Publishing each generated value as a custom metric to Amazon CloudWatch allows the developer to monitor and graph the values over time using CloudWatch's built-in capabilities.

Question 3

How should custom libraries be utilized in AWS Lambda?
A) Host the library on Amazon S3 and reference to it from the Lambda function.
B) Install the library locally and upload a ZIP file of the Lambda function.
C) Import the necessary Lambda blueprint when creating the function.
D) Modify the function runtime to include the necessary library.

Accepted Answer

The answer of How should custom libraries be utilized in...

Question 4

A Developer uses Amazon S3 buckets for static website hosting. The Developer creates one S3 bucket for the code and another S3 bucket for the assets, such as image and video files. Access is denied when a user attempts to access the assets bucket from the code bucket, with the website application showing a 403 error. How should the Developer solve this issue?
A) Create an IAM role and apply it to the assets bucket for the code bucket to be granted access.
B) Edit the bucket policy of the assets bucket to open access to all principals.
C) Edit the cross-origin resource sharing (CORS) configuration of the assets bucket to allow any origin to access the assets.
D) Change the code bucket to use AWS Lambda functions instead of static website hosting.

Accepted Answer

The answer of A Developer uses Amazon S3 buckets for...

Question 5

An online retail company has deployed a serverless application with AWS Lambda, Amazon API Gateway, Amazon S3, and Amazon DynamoDB using AWS CloudFormation. The company rolled out a new release with major upgrades to the Lambda function and deployed the release to production. Subsequently, the application stopped working. Which solution should bring the application back up as quickly as possible?
A) Redeploy the application on Amazon EC2 so the Lambda function can resolve dependencies
B) Migrate DynamoDB to Amazon RDS and redeploy the Lambda function
C) Roll back the Lambda function to the previous version
D) Deploy the latest Lambda function in a different Region

Accepted Answer

Rolling back the Lambda function to the previous version is the quickest way to restore the application to a working state, as it reverts the changes that caused the issue.

Question 6

A Development team wants to instrument their code to provide more detailed information to AWS X-Ray than simple outgoing and incoming requests. This will generate large amounts of data, so the Development team wants to implement indexing so they can filter the data. What should the Development team do to achieve this?
A) Add annotations to the segment document and the code
B) Add metadata to the segment document and the code
C) Configure the necessary X-Ray environment variables
D) Install required plugins for the appropriate AWS SDK

Accepted Answer

Annotations in AWS X-Ray allow you to index and filter trace data, enabling more detailed analysis and querying of the data collected.

Question 7

In a multi-container Docker environment in AWS Elastic Beanstalk, what is required to configure container instances in the environment?
A) An Amazon ECS task definition
B) An Amazon ECS cluster
C) A Dockerfile in an application package
D) A CLI for Elastic Beanstalk

Accepted Answer

An Amazon ECS task definition is required to define the containers that will run on the ECS cluster in a multi-container Docker environment in AWS Elastic Beanstalk.

Question 8

An application ingests a large number of small messages and stores them in a database. The application uses AWS Lambda. A Development team is making changes to the application's processing logic. In testing, it is taking more than 15 minutes to process each message. The team is concerned the current backend may time out. Which changes should be made to the backend system to ensure each message is processed in the MOST scalable way?
A) Add the messages to an Amazon SQS queue. Set up and Amazon EC2 instance to poll the queue and process messages as they arrive.
B) Add the messages to an Amazon SQS queue. Set up Amazon EC2 instances in an Auto Scaling group to poll the queue and process the messages as they arrive.
C) Create a support ticket to increase the Lambda timeout to 60 minutes to allow for increased processing time.
D) Change the application to directly insert the body of the message into an Amazon RDS database.

Accepted Answer

Using Amazon SQS with EC2 instances in an Auto Scaling group allows for scalable processing of messages without the 15-minute timeout limitation of AWS Lambda.

Question 9

A company has multiple Developers located across the globe who are updating code incrementally for a development project. When Developers upload code concurrently, internet connectivity is slow, and it is taking a long time to upload code for deployment in AWS Elastic Beanstalk. Which step will result in minimized upload and deployment time with the LEAST amount of administrative effort?
A) Allow the Developers to upload the code to an Amazon S3 bucket, and deploy it directly to Elastic Beanstalk.
B) Allow the Developers to upload the code to a central FTP server to deploy the application to Elastic Beanstalk.
C) Create an AWS CodeCommit repository, allow the Developers to commit code to it, and then directly deploy the code to Elastic Beanstalk.
D) Create a code repository on an Amazon EC2 instance so that all Developers can update the code, and deploy the application from the instance to Elastic Beanstalk.

Accepted Answer

Using AWS CodeCommit allows developers to commit code to a centralized repository, which can then be directly integrated with AWS Elastic Beanstalk for deployment, minimizing upload time and administrative effort.

Question 10

A company has implemented AWS CodeDeploy as part of its cloud native CI/CD stack. The company enables automatic rollbacks while deploying a new version of a popular web application from in-place to Amazon EC2. What occurs if the deployment of the new version fails due to code regression?
A) The last known good deployment is automatically restored using the snapshot stored in Amazon S3.
B) CodeDeploy switches the Amazon Route 53 alias records back to the known good green deployment and terminates the failed blue deployment.
C) A new deployment of the last known version of the application is deployed with a new deployment ID.
D) AWS CodePipeline promotes the most recent deployment with a SUCCEEDED status to production.

Accepted Answer

The answer of A company has implemented AWS CodeDeploy as...

Question 11

Where should the appspec.yml file be placed in order for AWS CodeDeploy to work?
A) In the root of the application source code directory structure
B) In the bin folder along with all the complied code
C) In an S3 bucket
D) In the same folder as the application configuration files

Accepted Answer

The appspec.yml file must be placed in the root of the application source code directory structure for AWS CodeDeploy to locate and use it during the deployment process.

Question 12

A Developer is building a serverless application using AWS Lambda and must create a REST API using an HTTP GET method. What needs to be defined to meet this requirement? (Choose two.)
A) A Lambda@Edge function
B) An Amazon API Gateway with a Lambda function
C) An exposed GET method in an Amazon API Gateway
D) An exposed GET method in the Lambda function
E) An exposed GET method in Amazon Route 53

Accepted Answer

To create a REST API using an HTTP GET method with AWS Lambda, you need to define an Amazon API Gateway with a Lambda function (B) and expose a GET method in the Amazon API Gateway (C).

Question 13

After installing the AWS CLI, a Developer tries to run the command aws configure but receives the following error: Error: aws: command not found What is the most likely cause of this error?
A) The aws executable is not in the PATH environment variable. The executable is not in the PATH environment variable.
B) Access to the aws executable has been denied to the installer. Access to the executable has been denied to the installer.
C) Incorrect AWS credentials were provided.
D) The aws script does not have an executable file mode. script does not have an executable file mode.

Accepted Answer

The error "aws: command not found" typically indicates that the system cannot locate the AWS CLI executable, which is usually due to it not being included in the PATH environment variable.

Question 14

A Developer has setup an Amazon Kinesis Stream with 4 shards to ingest a maximum of 2500 records per second. A Lambda function has been configured to process these records. In which order will these records be processed?
A) Lambda will receive each record in the reverse order it was placed into the stream following a LIFO (last-in, first-out) method
B) Lambda will receive each record in the exact order it was placed into the stream following a FIFO (first-in, first-out) method.
C) Lambda will receive each record in the exact order it was placed into the shard following a FIFO (first-in, first-out) method. There is no guarantee of order across shards.
D) The Developer can select FIFO, (first-in, first-out), LIFO (last-in, last-out), random, or request specific record using the getRecords API. The Developer can select FIFO, (first-in, first-out), LIFO (last-in, last-out), random, or request specific record using the getRecords API.

Accepted Answer

Records are processed in the order they are placed into each shard (FIFO), but there is no guarantee of order across different shards.

Question 15

A web application is designed to allow new users to create accounts using their email addresses. The application will store attributes for each user, and is expecting millions of user to sign up. What should the Developer implement to achieve the design goals?
A) Amazon Cognito user pools
B) AWS Mobile Hub user data storage
C) Amazon Cognito Sync
D) AWS Mobile Hub cloud logic

Accepted Answer

Amazon Cognito user pools provide a scalable user directory that can handle millions of users, allowing them to sign up and sign in using their email addresses. It is specifically designed for managing user authentication and attributes.

Question 16

A Developer decides to store highly secure data in Amazon S3 and wants to implement server-side encryption (SSE) with granular control of who can access the master key. Company policy requires that the master key be created, rotated, and disabled easily when needed, all for security reasons. Which solution should be used to meet these requirements?
A) SSE with Amazon S3 managed keys (SSE-S3)
B) SSE with AWS KMS managed keys (SSE-KMS)
C) SSE with AWS Secrets Manager
D) SSE with customer-provided encryption keys

Accepted Answer

SSE with AWS KMS managed keys (SSE-KMS) allows for granular control over the master key, including creation, rotation, and disabling, meeting the company's security policy requirements.

Question 17

A Developer is writing an application in AWS Lambda. To simplify testing and deployments, the Developer needs the database connection string to be easily changed without modifying the Lambda code. How can this requirement be met?
A) Store the connection string as a secret in AWS Secrets Manager.
B) Store the connection string in an IAM user account.
C) Store the connection string in AWS KMS.
D) Store the connection string as a Lambda layer.

Accepted Answer

The answer of A Developer is writing an application in...

Question 18

A Developer is writing a REST service that will add items to a shopping list. The service is built on Amazon API Gateway with AWS Lambda integrations. The shopping list items are sent as query string parameters in the method request. How should the Developer convert the query string parameters to arguments for the Lambda function?
A) Enable request validation
B) Include the Amazon Resource Name (ARN) of the Lambda function
C) Change the integration type
D) Create a mapping template

Accepted Answer

The answer of A Developer is writing a REST service...

Question 19

A Developer is leveraging a Border Gateway Protocol (BGP)-based AWS VPN connection to connect from on-premises to Amazon EC2 instances in the Developer's account. The Developer is able to access an EC2 instance in subnet A, but is unable to access an EC2 instance in subnet B in the same VPC. Which logs can the Developer use to verify whether the traffic is reaching subnet B?
A) VPN logs
B) BGP logs
C) VPC Flow Logs
D) AWS CloudTrail logs

Accepted Answer

VPC Flow Logs can be used to capture information about the IP traffic going to and from network interfaces in the VPC, which can help verify if traffic is reaching subnet B.

Question 20

A Lambda function is packaged for deployment to multiple environments, including development, test, production, etc. Each environment has unique set of resources such as databases, etc. How can the Lambda function use the resources for the current environment?
A) Apply tags to the Lambda functions.
B) Hardcore resources in the source code.
C) Use environment variables for the Lambda functions.
D) Use separate function for development and production.

Accepted Answer

Environment variables allow you to configure the Lambda function to use different resources for each environment without changing the source code.

Exam 6: AWS Certified Developer Associate (DVA-C01)

A legacy service has an XML-based SOAP interface. The Developer wants to expose the functionality of the service to external clients with the Amazon API Gateway. Which technique will accomplish this?

A Developer has written an application that runs on Amazon EC2 instances and generates a value every minute. The Developer wants to monitor and graph the values generated over time without logging in to the instance each time. Which approach should the Developer use to achieve this goal?

How should custom libraries be utilized in AWS Lambda?

In a multi-container Docker environment in AWS Elastic Beanstalk, what is required to configure container instances in the environment?

A company has implemented AWS CodeDeploy as part of its cloud native CI/CD stack. The company enables automatic rollbacks while deploying a new version of a popular web application from in-place to Amazon EC2. What occurs if the deployment of the new version fails due to code regression?

Where should the appspec.yml file be placed in order for AWS CodeDeploy to work?

A Developer is building a serverless application using AWS Lambda and must create a REST API using an HTTP GET method. What needs to be defined to meet this requirement? (Choose two.)

After installing the AWS CLI, a Developer tries to run the command aws configure but receives the following error: Error: aws: command not found What is the most likely cause of this error?

A Developer has setup an Amazon Kinesis Stream with 4 shards to ingest a maximum of 2500 records per second. A Lambda function has been configured to process these records. In which order will these records be processed?

A web application is designed to allow new users to create accounts using their email addresses. The application will store attributes for each user, and is expecting millions of user to sign up. What should the Developer implement to achieve the design goals?

A Developer is writing an application in AWS Lambda. To simplify testing and deployments, the Developer needs the database connection string to be easily changed without modifying the Lambda code. How can this requirement be met?

A Lambda function is packaged for deployment to multiple environments, including development, test, production, etc. Each environment has unique set of resources such as databases, etc. How can the Lambda function use the resources for the current environment?