Question 1

Which of the following is an example of a good DynamoDB hash key schema for provisioned throughput efficiency?

Accepted Answer

A)  User ID, where the application has many different users. 
B)  Status Code where most status codes are the same 
C)  Device ID, where one is by far more popular than all the others. 
D)  Game Type, where there are three possible game types

Question 2

A Developer is migrating existing applications to AWS. These applications use MongoDB as their primary data store, and they will be deployed to Amazon EC2 instances. Management requires that the Developer minimize changes to applications while using AWS services. Which solution should the Developer use to host MongoDB in AWS?

Accepted Answer

A)  Install MongoDB on the same instance where the application is running. 
B)  Deploy Amazon DocumentDB in MongoDB compatibility mode. 
C)  Use Amazon API Gateway to translate API calls from MongoDB to Amazon DynamoDB. 
D)  Replicate the existing MongoDB workload to Amazon DynamoDB.

Question 3

A Developer wants to upload data to Amazon S3 and must encrypt the data in transit. Which of the following solutions will accomplish this task? (Choose two.)

Accepted Answer

A)  Set up hardware VPN tunnels to a VPC and access S3 through a VPC endpoint 
B)  Set up Client-Side Encryption with an AWS KMS-Managed Customer Master Key 
C)  Set up Server-Side Encryption with AWS KMS-Managed Keys 
D)  Transfer the data over an SSL connection 
E)  Set up Server-Side Encryption with S3-Managed Keys

Question 4

A development team is designing a mobile app that requires multi-factor authentication. Which steps should be taken to achieve this? (Choose two.)

Accepted Answer

A)  Use Amazon Cognito to create a user pool and create users in the user pool. 
B)  Send multi-factor authentication text codes to users with the Amazon SNS Publish API call in the app code. 
C)  Enable multi-factor authentication for the Amazon Cognito user pool. 
D)  Use AWS IAM to create IAM users. 
E)  Enable multi-factor authentication for the users created in AWS IAM.

Question 5

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

Accepted Answer

A)  Implement retries with exponential backoff 
B)  Use a PutRecord API instead of PutRecords 
C)  Reduce the frequency and/or size of the requests 
D)  Use Amazon SNS instead of Kinesis 
E)  Reduce the number of KCL consumers

Question 6

A current architecture uses many Lambda functions invoking one another as a large state machine. The coordination of this state machine is legacy custom code that breaks easily. Which AWS Service can help refactor and manage the state machine?

Accepted Answer

A)  AWS Data Pipeline 
B)  AWS SNS with AWS SQS 
C)  Amazon Elastic MapReduce 
D)  AWS Step Functions

Question 7

A Developer writes an AWS Lambda function and uploads the code in a .ZIP file to Amazon S3. The Developer makes changes to the code and uploads a new .ZIP file to Amazon S3. However, Lambda executes the earlier code. How can the Developer fix this in the LEAST disruptive way?

Accepted Answer

A)  Create another Lambda function and specify the new .ZIP file. 
B)  Call the update-function-code API. Call the update-function-code API. 
C)  Remove the earlier .ZIP file first, then add the new .ZIP file. 
D)  Call the create-alias API. create-alias API.

Question 8

A developer is creating an event handling system. To handle messages asynchronously, the developer created a standard Amazon SQS queue. Quality assurance testing reveals that some events were processed multiple times. What is the recommended way to ensure the events are not processed more than once?

Accepted Answer

A)  Change long polling to short polling. 
B)  Use a FIFO queue and configure deduplication. 
C)  Convert the standard SQS queue into a FIFO queue. 
D)  Send the messages with message timers.

Question 9

A company wants to containerize an existing three-tier web application and deploy it to Amazon ECS Fargate. The application is using session data to keep track of user activities. Which approach would provide the BEST user experience?

Accepted Answer

A)  Provision a Redis cluster in Amazon ElastiCache and save the session data in the cluster. 
B)  Create a session table in Amazon Redshift and save the session data in the database table. 
C)  Enable session stickiness in the existing Network Load Balancer and manage the session data in the container. 
D)  Use an Amazon S3 bucket as data store and save the session data in the bucket.

Question 10

A developer is creating an application to process a large number of requests. Requests must be processed in order, and each request should be processed only once. How should Amazon SQS be deployed to achieve this?

Accepted Answer

A)  Configure First in First out (FIFO) delivery in a standard Amazon SQS queue to process requests. 
B)  Use an SQS FIFO queue to process requests. 
C)  Use the SetOrder attribute to ensure sequential request processing. 
D)  Convert the standard queue to a FIFO queue by renaming the queue to use the .fifo suffix.

Question 11

Two containerized microservices are hosted on Amazon EC2 ECS. The first microservice reads an Amazon RDS Aurora database instance, and the second microservice reads an Amazon DynamoDB table. How can each microservice be granted the minimum privileges?

Accepted Answer

A)  Set ECS_ENABLE_TASK_IAM_ROLE to false on EC2 instance boot in ECS agent configuration file. Run the first microservice with an IAM role for ECS tasks with read-only access for the Aurora database. Run the second microservice with an IAM role for ECS tasks with read-only access to DynamoDB. 
B)  Set ECS_ENABLE_TASK_IAM_ROLE to false on EC2 instance boot in the ECS agent configuration file. Grant the instance profile role read-only access to the Aurora database and DynamoDB. 
C)  Set ECS_ENABLE_TASK_IAM_ROLE to true on EC2 instance boot in the ECS agent configuration file. Run the first microservice with an IAM role for ECS tasks with read-only access for the Aurora database. Run the second microservice with an IAM role for ECS tasks with read-only access to DynamoDB. 
D)  Set ECS_ENABLE_TASK_IAM_ROLE to true on EC2 instance boot in the ECS agent configuration file. Grant the instance profile role read-only access to the Aurora database and DynamoDB.

Question 12

A developer is building a WebSocket API using Amazon API Gateway. The payload sent to this API is JSON that includes an action key. This key can have three different values: create, update, and remove. The developer must integrate with different routes based on the value of the action key of the incoming JSON payload. How can the developer accomplish this task with the LEAST amount of configuration?

Accepted Answer

A)  Deploy the WebSocket API to three stages for the respective routes: create, update, and remove 
B)  Create a new route key and set the name as action 
C)  Set the value of the route selection expression to action 
D)  Set the value of the route selection expression to $request.body.action

Question 13

A Developer is creating a template that uses AWS CloudFormation to deploy an application. This application is serverless and uses Amazon API Gateway, Amazon DynamoDB, and AWS Lambda. Which tool should the Developer use to define simplified syntax for expressing serverless resources?

Accepted Answer

A)  CloudFormation serverless intrinsic functions 
B)  AWS serverless express 
C)  An AWS serverless application model 
D)  A CloudFormation serverless plugin

Question 14

An application contains two components: one component to handle HTTP requests, and another component to handle background processing tasks. Each component must scale independently. The developer wants to deploy this application using AWS Elastic Beanstalk. How should this application be deployed, based on these requirements?

Accepted Answer

A)  Deploy the application in a single Elastic Beanstalk environment. 
B)  Deploy each component in a separate Elastic Beanstalk environment. 
C)  Use multiple Elastic Beanstalk environments for the HTTP component, but one environment for the background task component. 
D)  Use multiple Elastic Beanstalk environments for the background task component, but one environment for the HTTP component.

Question 15

Which of the following statements about SWF are true? (Choose three.)

Accepted Answer

A)  SWF tasks are assigned once and never duplicated 
B)  SWF requires an S3 bucket for workflow storage 
C)  SWF workflow executions can last up to a year 
D)  SWF triggers SNS notifications on task assignment 
E)  SWF uses deciders and workers to complete tasks
F) SWF requires at least 1 EC2 instance per domain

Question 16

A developer is automating a new application deployment with AWS Serverless Application Model (AWS SAM). The new application has one AWS Lambda function and one Amazon S3 bucket. The Lambda function must access the S3 bucket to only read objects. How should the developer configure AWS SAM to grant the necessary read privilege to the S3 bucket?

Accepted Answer

A)  Reference a second Lambda authorizer function. 
B)  Add a custom S3 bucket policy to the Lambda function. 
C)  Create an Amazon Simple Queue Service (SQS) topic for only S3 object reads. Reference the topic in the template. 
D)  Add the S3ReadPolicy template to the Lambda function's execution role.

Question 17

How is provisioned throughput affected by the chosen consistency model when reading data from a DynamoDB table?

Accepted Answer

A)  Strongly consistent reads use the same amount of throughput as eventually consistent reads 
B)  Strongly consistent reads use more throughput than eventually consistent reads. 
C)  Strongly consistent reads use less throughput than eventually consistent reads 
D)  Strongly consistent reads use variable throughput depending on read activity

Question 18

Your application is trying to upload a 6 GB file to Simple Storage Service and receive a "Your proposed upload exceeds the maximum allowed object size." error message. What is a possible solution for this?

Accepted Answer

A)  None, Simple Storage Service objects are limited to 5 GB 
B)  Use the multi-part upload API for this object 
C)  Use the large object upload API for this object 
D)  Contact support to increase your object size limit 
E)  Upload to a different region

Question 19

A development team is working on a mobile app that allows users to upload pictures to Amazon S3. The team expects the app will be used by hundreds of thousands of users during a single event simultaneously. Once the pictures are uploaded, the backend service will scan and parse the pictures for inappropriate content. Which approach is the MOST resilient way to achieve this goal, which also smooths out temporary volume spikes for the backend service?

Accepted Answer

A)  Develop an AWS Lambda function to check the upload folder in the S3 bucket. If new uploaded pictures are detected, the Lambda function will scan and parse them. 
B)  Once a picture is uploaded to Amazon S3, publish the event to an Amazon SQS queue. Use the queue as an event source to trigger an AWS Lambda function. In the Lambda function, scan and parse the picture. 
C)  When the user uploads a picture, invoke an API hosted in Amazon API Gateway. The API will invoke an AWS Lambda function to scan and parse the picture. 
D)  Create a state machine in AWS Step Functions to check the upload folder in the S3 bucket. If a new picture is detected, invoke an AWS Lambda function to scan and parse it.

Question 20

A developer is creating AWS CloudFormation templates to manage an application's deployment in Amazon Elastic Container Service (Amazon ECS) through AWS CodeDeploy. The developer wants to automatically deploy new versions of the application to a percentage of users before the new version becomes available for all users. How should the developer manage the deployment of the new version?

Accepted Answer

A)  Modify the CloudFormation template to include a Transform section and the AWS::CodeDeploy::BlueGreen hook. 
B)  Deploy the new version in a new CloudFormation stack. After testing is complete, update the application's DNS records for the new stack. 
C)  Run CloudFormation stack updates on the application stack to deploy new application versions when they are available. 
D)  Create a nested stack for the new version. Include a Transform section and the AWS::CodeDeploy::BlueGreen hook.

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