Question 1

During non-peak hours, a Developer wants to minimize the execution time of a full Amazon DynamoDB table scan without affecting normal workloads. The workloads average half of the strongly consistent read capacity units during non-peak hours. How would the Developer optimize this scan?

Accepted Answer

The answer of During non-peak hours, a Developer wants to...

Question 2

A developer is planning to use an Amazon API Gateway and AWS Lambda to provide a REST API. The developer will have three distinct environments to manage: development, test, and production. How should the application be deployed while minimizing the number of resources to manage?

Accepted Answer

Using one API Gateway with multiple stages and one Lambda function with multiple aliases allows the developer to manage different environments efficiently while minimizing the number of resources. Each stage can correspond to a different environment, and aliases can point to different versions of the Lambda function for each environment.

Question 3

The Lambda function below is being called through an API using Amazon API Gateway. The average execution time for the Lambda function is about 1 second. The pseudocode for the Lambda function is as shown in the exhibit.  What two actions can be taken to improve the performance of this Lambda function without increasing the cost of the solution? (Select two.)

Accepted Answer

The answer of The Lambda function below is being called...

Question 4

A company is running a custom application on a set of on-premises Linux servers that are accessed using Amazon API Gateway AWS X-Ray tracing has been enabled on the API test stage. How can a developer enable X-Ray tracing on the on-premises servers with the LEAST amount of configuration?

Accepted Answer

The X-Ray SDK is a lightweight library that can be installed on the on-premises servers to capture and relay tracing data to the X-Ray service. This requires the least amount of configuration compared to the other options.

Question 5

A developer wants to ensure the Amazon EC2 instances in AWS Elastic Beanstalk execute a certain set of commands before the application is ready to use. Which Elastic Beanstalk feature will allow the developer to accomplish this?

Accepted Answer

The .ebextensions feature in AWS Elastic Beanstalk allows developers to configure and customize the environment by executing specific commands and scripts during the instance setup process.

Question 6

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 FIFO (First-In-First-Out) queue in Amazon SQS ensures that messages are processed in the exact order they are sent and each message is processed only once, which is required for the given scenario.

Question 7

An application on AWS is using third-party APIs. The Developer needs to monitor API errors in the code, and wants to receive notifications if failures go above a set threshold value. How can the Developer achieve these requirements?

Accepted Answer

The developer can publish a custom metric to Amazon CloudWatch to monitor API errors. Amazon SNS can then be used to send notifications when the errors exceed a set threshold.

Question 8

A Developer wants to use AWS X-Ray to trace a user request end-to-end throughput the software stack. The Developer made the necessary changes in the application tested it, and found that the application is able to send the traces to AWS X-Ray. However, when the application is deployed to an EC2 instance, the traces are not available. Which of the following could create this situation? (Choose two.)

Accepted Answer

The X-Ray daemon is not installed on the EC2 instance, and the instance role does not have "xray:PutTraceSegments" and "xray:PutTelemetryRecords" permissions.

Question 9

A development team uses AWS Elastic Beanstalk to deploy a Java-based web application. The team wants to ensure that the changes to the source code and the configuration are always deployed on new instances. The team configures the Elastic Beanstalk environment to use immutable updates. However, an error occurs the first time a change is deployed with the new update policy. What is the MOST likely cause of this issue?

Accepted Answer

Immutable updates are only supported for Java-based applications if the developer also modifies the .ebextensions/immutable-updates.config file to enable immutable updates.

Question 10

How can a developer use a debugger for AWS Lambda code that is deployed with AWS Serverless Application Model (AWS SAM)?

Accepted Answer

AWS SAM allows developers to invoke Lambda functions locally in debug mode, enabling them to use breakpoints and step through the code as if it were running in the cloud.

Question 11

An application takes longer than expected to process an Amazon SQS message. What should the developer do to the application so that other instances do not pick up the same message?

Accepted Answer

The answer of An application takes longer than expected to...

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

The answer of A developer is building a WebSocket API...

Question 13

A developer tested an application locally and then deployed it to AWS Lambda. While testing the application remotely, the Lambda function fails with an access denied message. How can this issue be addressed?

Accepted Answer

The issue is likely due to the Lambda function's execution role lacking the necessary permissions. Updating the execution role to include the required permissions should resolve the access denied error.

Question 14

A large company has its application components distributed across multiple AWS accounts. The company needs to collect and visualize trace data across these accounts. What should be used to meet these requirements?

Accepted Answer

AWS X-Ray is a service designed to collect and visualize trace data across distributed applications, making it suitable for the company's needs.

Question 15

A Developer is receiving HTTP 400: ThrottlingException errors intermittently when calling the Amazon CloudWatch API. When a call fails, no data is retrieved. What best practice should first be applied to address this issue?

Accepted Answer

The answer of A Developer is receiving HTTP 400: ThrottlingException...

Question 16

A Developer has created a software package to be deployed on multiple EC2 instances using IAM roles. What actions could be performed to verify IAM access to get records from Amazon Kinesis Streams? (Select TWO.)

Accepted Answer

The answer of A Developer has created a software package...

Question 17

A gaming company is developing a mobile game application for iOS® and Android® platforms. This mobile game securely stores user data locally on the device. The company wants to allow users to use multiple device for the game, which requires user data synchronization across device. Which service should be used to synchronize user data across devices without the need to create a backend application?

Accepted Answer

Amazon Cognito provides user identity and data synchronization across devices, allowing users to access their data from multiple devices without needing a custom backend.

Question 18

A developer is setting up Amazon API Gateway for their company's products. The API will be used by registered developers to query and update their environments. The company wants to limit the amount of requests end users can send for both cost and security reasons. Management wants to offer registered developers the option of buying larger packages that allow for more requests. How can the developer accomplish this with the LEAST amount of overhead management?

Accepted Answer

Usage plans in API Gateway allow you to define throttling and quota limits for individual API keys, making it easy to manage different request limits for different users with minimal overhead.

Question 19

A Developer wants to use AWS X-Ray to trace a user request end-to-end throughput the software stack. The Developer made the necessary changes in the application tested it, and found that the application is able to send the traces to AWS X-Ray. However, when the application is deployed to an EC2 instance, the traces are not available. Which of the following could create this situation? (Select two.)

Accepted Answer

The X-Ray daemon is not installed on the EC2 instance, and the instance role does not have "xray:PutTraceSegments" and "xray:PutTelemetryRecords" permissions.

Question 20

A company experienced partial downtime during the last deployment of a new application. AWS Elastic Beanstalk split the environment's Amazon EC2 instances into batches and deployed a new version one batch at a time after taking them out of service. Therefore, full capacity was not maintained during deployment. The developer plans to release a new version of the application, and is looking for a policy that will maintain full capacity and minimize the impact of the failed deployment. Which deployment policy should the developer use?

Accepted Answer

Rolling with an Additional Batch maintains full capacity by adding an extra batch of instances during deployment, minimizing downtime and impact of failed deployments.

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

During non-peak hours, a Developer wants to minimize the execution time of a full Amazon DynamoDB table scan without affecting normal workloads. The workloads average half of the strongly consistent read capacity units during non-peak hours. How would the Developer optimize this scan?

A developer is planning to use an Amazon API Gateway and AWS Lambda to provide a REST API. The developer will have three distinct environments to manage: development, test, and production. How should the application be deployed while minimizing the number of resources to manage?

A company is running a custom application on a set of on-premises Linux servers that are accessed using Amazon API Gateway AWS X-Ray tracing has been enabled on the API test stage. How can a developer enable X-Ray tracing on the on-premises servers with the LEAST amount of configuration?

A developer wants to ensure the Amazon EC2 instances in AWS Elastic Beanstalk execute a certain set of commands before the application is ready to use. Which Elastic Beanstalk feature will allow the developer to accomplish this?

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?

An application on AWS is using third-party APIs. The Developer needs to monitor API errors in the code, and wants to receive notifications if failures go above a set threshold value. How can the Developer achieve these requirements?

How can a developer use a debugger for AWS Lambda code that is deployed with AWS Serverless Application Model (AWS SAM) ?

An application takes longer than expected to process an Amazon SQS message. What should the developer do to the application so that other instances do not pick up the same message?

A developer tested an application locally and then deployed it to AWS Lambda. While testing the application remotely, the Lambda function fails with an access denied message. How can this issue be addressed?

A large company has its application components distributed across multiple AWS accounts. The company needs to collect and visualize trace data across these accounts. What should be used to meet these requirements?

A Developer is receiving HTTP 400: ThrottlingException errors intermittently when calling the Amazon CloudWatch API. When a call fails, no data is retrieved. What best practice should first be applied to address this issue?

A Developer has created a software package to be deployed on multiple EC2 instances using IAM roles. What actions could be performed to verify IAM access to get records from Amazon Kinesis Streams? (Select TWO.)