Amazon DVA-C02 AWS Certified Developer – Associate (DVA-C02) Free Practice Test — 30 Questions

Question 1

A company is planning to migrate its on-premises application to AWS. The application consists of a web server, an application server, and a database server. The company expects a steady increase in traffic over the next year and wants to ensure that the architecture can scale efficiently. Which AWS services and architectural principles should the company consider to achieve a highly available and scalable solution while minimizing costs?

Accepted Answer

Use Amazon EC2 with Auto Scaling and Elastic Load Balancing, and store data in Amazon RDS with Multi-AZ deployments.

Question 2

A company is developing a serverless application using AWS Lambda and Amazon API Gateway. The application needs to handle a variable number of requests, with each request potentially taking different amounts of time to process. The company wants to ensure that they are only charged for the compute time they actually use, while also maintaining low latency for users. Which architectural approach should the company adopt to optimize both cost and performance?

Accepted Answer

Use AWS Lambda with provisioned concurrency to pre-warm instances based on expected traffic patterns.

Question 3

A company is deploying a new version of its application using AWS Elastic Beanstalk. The application is currently running version 1.0, and the team has developed version 2.0, which includes several new features and performance improvements. The team decides to implement a rolling update strategy to minimize downtime and ensure a smooth transition. If the application has 10 instances running version 1.0, and the rolling update is configured to update 2 instances at a time, how many total updates will be required to complete the deployment of version 2.0?

Accepted Answer

5 updates

Question 4

A company is deploying a new version of its application using AWS Elastic Beanstalk. The application is currently running version 1.0, and the team has developed version 2.0, which includes several new features and performance improvements. The team decides to implement a rolling update strategy to minimize downtime and ensure a smooth transition. If the application has 10 instances running version 1.0, and the rolling update is configured to update 2 instances at a time, how many total updates will be required to complete the deployment of version 2.0?

Accepted Answer

5 updates

Question 5

A software development team is using AWS CodeCommit to manage their source code. They have set up a repository that contains multiple branches for different features. The team has a policy that requires all code changes to be reviewed before they can be merged into the main branch. To enforce this policy, they want to implement a workflow that automatically triggers a review request whenever a pull request is created. Which of the following configurations would best achieve this goal while ensuring that the review process is efficient and adheres to best practices?

Accepted Answer

Configure AWS CodeCommit to use AWS Lambda to send notifications to a designated review team whenever a pull request is created, allowing them to review the changes directly in the CodeCommit console.

Question 6

A software development team is implementing a CI/CD pipeline for their web application. They have set up automated testing that runs every time code is pushed to the repository. The team has noticed that the build times are increasing significantly due to the number of tests being executed. To optimize the pipeline, they decide to implement a strategy that allows them to run only a subset of tests based on the changes made in the code. Which of the following strategies would best support this optimization while ensuring that the integrity of the application is maintained?

Accepted Answer

Implement test impact analysis to determine which tests are affected by the recent code changes and run only those tests.

Question 7

A financial services company is implementing AWS Key Management Service (KMS) to manage encryption keys for sensitive customer data. They need to ensure that their encryption keys are rotated automatically every year and that only specific IAM roles have access to these keys. Additionally, they want to track the usage of these keys for compliance purposes. Which combination of AWS KMS features and best practices should the company implement to meet these requirements?

Accepted Answer

Enable automatic key rotation, create IAM policies to restrict access to specific roles, and enable AWS CloudTrail logging for key usage tracking.

Question 8

A software development team is using AWS CodeBuild to automate their build process. They have configured a build project that uses a Docker image as the build environment. The team needs to ensure that the build artifacts are stored in an S3 bucket after each successful build. Additionally, they want to implement a notification system that triggers an AWS Lambda function whenever a build fails. Which of the following configurations would best achieve these requirements while ensuring minimal manual intervention?

Accepted Answer

Configure the build project to output artifacts to the specified S3 bucket and set up an Amazon CloudWatch Events rule to trigger the Lambda function on build failure events.

Question 9

A company is using AWS CloudFormation to manage its infrastructure as code. They have a template that defines a VPC, several subnets, and EC2 instances. The company wants to ensure that the EC2 instances are launched only in specific availability zones to enhance fault tolerance. They also want to implement a mechanism to automatically update the instances when the template is modified. Which of the following strategies should the company employ to achieve these requirements effectively?

Accepted Answer

Use the `AvailabilityZone` parameter in the CloudFormation template and enable the `UpdatePolicy` attribute for the EC2 instances.

Question 10

In a microservices architecture, you are tasked with designing an API for a new service that needs to interact with multiple other services. The API should be able to handle requests efficiently and maintain a high level of performance while ensuring that the services remain loosely coupled. Which API design pattern would be most suitable for this scenario, considering the need for scalability and flexibility in communication between services?

Accepted Answer

API Gateway Pattern

Question 11

A company is using Amazon CloudWatch to monitor the performance of its application hosted on AWS. They have set up custom metrics to track the number of requests processed by their application and the average response time. The company wants to create an alarm that triggers when the average response time exceeds 2 seconds for a period of 5 consecutive minutes. If the average response time is recorded as follows over a 10-minute period: 1.5s, 1.8s, 2.1s, 2.3s, 2.0s, 1.9s, 1.7s, 2.4s, 2.5s, and 2.2s, how many times will the alarm trigger based on the defined conditions?

Accepted Answer

3

Question 12

A development team is using the AWS Cloud Development Kit (CDK) to deploy a serverless application that includes an AWS Lambda function and an Amazon DynamoDB table. The team wants to ensure that the Lambda function has the necessary permissions to read and write to the DynamoDB table. They are considering using IAM roles and policies to manage these permissions. Which approach should the team take to effectively grant the Lambda function the required permissions while adhering to the principle of least privilege?

Accepted Answer

Create an IAM role for the Lambda function with a policy that allows only the specific actions needed on the DynamoDB table, and attach this role to the Lambda function during its creation in the CDK stack.

Question 13

In a microservices architecture, a company is experiencing challenges with service communication and data consistency across its various services. They are considering implementing the Saga pattern to manage distributed transactions. Which of the following statements best describes the implications of using the Saga pattern in this context?

Accepted Answer

The Saga pattern allows for a sequence of local transactions to be coordinated, ensuring eventual consistency across services without requiring a distributed lock mechanism.

Question 14

A software development team is implementing a CI/CD pipeline using AWS services. They want to ensure that their application is automatically built, tested, and deployed whenever changes are made to the code repository. The team decides to use AWS CodePipeline, AWS CodeBuild, and AWS CodeDeploy. They need to configure the pipeline to trigger a build whenever a new commit is pushed to their GitHub repository. Additionally, they want to ensure that the build artifacts are stored in Amazon S3 and that the deployment occurs only if the build is successful. Which of the following configurations best achieves this goal?

Accepted Answer

Set up a webhook in GitHub to trigger AWS CodePipeline, configure CodePipeline to use CodeBuild for building the application, and specify S3 as the artifact store. Use CodeDeploy to deploy the application only after a successful build.

Question 15

A company is using AWS CloudFormation to manage its infrastructure as code. They have a template that defines several resources, including an Amazon EC2 instance, an Amazon RDS database, and an Amazon S3 bucket. The company wants to ensure that the EC2 instance can only be launched if the RDS database is successfully created. Which of the following strategies should the company implement in their CloudFormation template to enforce this dependency?

Accepted Answer

Use the `DependsOn` attribute to specify that the EC2 instance depends on the RDS database.

Question 16

A company is developing a serverless application using AWS Lambda and Amazon API Gateway. The application needs to handle a variable load of requests, with peak times reaching up to 10,000 requests per second. The development team is considering using AWS Lambda\'s concurrency limits and the API Gateway\'s throttling settings to manage this load effectively. If the team sets the reserved concurrency for the Lambda function to 5,000 and the API Gateway\'s rate limit to 2,000 requests per second, what will be the potential impact on the application during peak load times, and how should the team adjust their settings to optimize performance?

Accepted Answer

The application will experience throttling at the API Gateway level, limiting the number of requests processed to 2,000 per second, while the Lambda function can handle up to 5,000 concurrent executions.

Question 17

A company is implementing a new microservices architecture to improve its operational excellence. They have identified that one of the key performance indicators (KPIs) for their services is the average response time for API calls. Currently, the average response time is 300 milliseconds, and they aim to reduce it by 20% over the next quarter. If they successfully achieve this goal, what will be the new average response time in milliseconds?

Accepted Answer

240 milliseconds

Question 18

A smart agriculture company is implementing AWS IoT Core to monitor soil moisture levels across multiple fields. Each field has multiple sensors that send data every 5 minutes. The company wants to ensure that the data is processed efficiently and that alerts are generated if moisture levels fall below a certain threshold. They are considering using AWS Lambda for processing the incoming data. Which of the following best describes how AWS IoT Core interacts with AWS Lambda in this scenario?

Accepted Answer

AWS IoT Core can trigger AWS Lambda functions directly based on incoming messages from the sensors, allowing for real-time processing and alert generation.

Question 19

A company is using AWS CloudFormation to manage its infrastructure as code. They have a CloudFormation template that defines a VPC, subnets, and EC2 instances. The company wants to ensure that the EC2 instances are launched in a specific subnet and that they are tagged appropriately for cost allocation. Additionally, they want to implement a condition that allows the EC2 instances to be created only if a certain parameter, `CreateInstances`, is set to `true`. Which of the following configurations in the CloudFormation template would best achieve this requirement?

Accepted Answer

Use the `Condition` intrinsic function to check the value of `CreateInstances` and include the `Condition` in the `Resources` section for the EC2 instances, while also specifying the `SubnetId` and `Tags` properties accordingly.

Question 20

A company is developing a full-stack application that requires a robust backend to handle user authentication, data storage, and API management. The frontend is built using React, and the backend is implemented using AWS Lambda functions. The application needs to ensure that user data is securely stored and that the API can handle a high volume of requests efficiently. Which architectural approach should the development team adopt to optimize performance and security while ensuring scalability?

Accepted Answer

Implement a serverless architecture using AWS Lambda with Amazon API Gateway and Amazon DynamoDB for data storage.

Question 21

In a microservices architecture deployed on Amazon ECS, you are tasked with optimizing the resource allocation for a service that experiences variable traffic patterns. The service is currently running on EC2 instances with a fixed number of CPU and memory resources. You need to implement a solution that allows for dynamic scaling based on the service\'s load while minimizing costs. Which approach would best achieve this goal?

Accepted Answer

Utilize ECS Service Auto Scaling to adjust the number of tasks based on CloudWatch metrics such as CPU utilization and request count.

Question 22

A company is designing a data model for a new application that will handle user-generated content, such as comments and reviews. The application is expected to scale significantly, with millions of users contributing data daily. The development team is considering how to partition the data effectively to optimize performance and manageability. Given the following partitioning strategies: (1) partitioning by user ID, (2) partitioning by content type, (3) partitioning by geographical location, and (4) partitioning by timestamp, which strategy would best support the application\'s scalability and performance needs while minimizing the risk of hot partitions?

Accepted Answer

Partitioning by user ID

Question 23

In a microservices architecture, a developer is tasked with implementing a service that handles user authentication. The service must be designed to ensure high availability and scalability while maintaining security best practices. Which design pattern should the developer primarily consider to achieve these goals effectively?

Accepted Answer

Circuit Breaker Pattern

Question 24

A company is using AWS CloudFormation to manage its infrastructure as code. They have a CloudFormation template that defines a VPC, subnets, and EC2 instances. The company wants to ensure that the EC2 instances are launched in a specific subnet based on the instance type. If the instance type is `t2.micro`, it should be launched in `SubnetA`, and if it is `t2.large`, it should be launched in `SubnetB`. How can the company achieve this conditional resource creation in their CloudFormation template?

Accepted Answer

By using the `Condition` section to define conditions for resource creation based on the instance type.

Question 25

A data scientist is tasked with developing a machine learning model to predict customer churn for a subscription-based service. The dataset contains various features, including customer demographics, usage patterns, and previous interactions with customer support. After training the model, the data scientist evaluates its performance using precision, recall, and F1-score. If the model achieves a precision of 0.85 and a recall of 0.75, what is the F1-score of the model, and what does this indicate about the model\'s performance in terms of balancing precision and recall?

Accepted Answer

0.79

Question 26

In a microservices architecture deployed on AWS, you have multiple services that need to communicate with each other efficiently. You decide to implement service discovery and load balancing to manage the traffic effectively. Given that you are using AWS Elastic Load Balancing (ELB) and AWS Cloud Map for service discovery, how would you ensure that the services can dynamically discover each other and balance the load effectively? Consider the following aspects: service registration, health checks, and routing policies.

Accepted Answer

Use AWS Cloud Map for service registration and health checks, and configure ELB with a round-robin routing policy to distribute traffic evenly among healthy instances.

Question 27

A development team is building a mobile application using AWS Amplify to manage user authentication and data storage. They need to implement a feature that allows users to upload images to an S3 bucket and store metadata in a DynamoDB table. The team wants to ensure that the images are accessible only to authenticated users and that the metadata is linked to the user who uploaded the image. Which approach should the team take to achieve this functionality while adhering to best practices for security and scalability?

Accepted Answer

Use AWS Amplify's built-in storage and authentication modules to configure S3 bucket policies and DynamoDB access control based on user identity.

Question 28

A company is migrating its application to AWS and needs to choose a database service that can handle high-velocity data ingestion while providing low-latency access to data. The application requires a flexible schema and the ability to scale horizontally. Additionally, the company anticipates that the data will be accessed by multiple applications with varying access patterns. Considering these requirements, which database service would be the most suitable choice for this scenario?

Accepted Answer

Amazon DynamoDB

Question 29

A company is planning to migrate its on-premises application to AWS. The application consists of a web server, an application server, and a database server. The company wants to ensure high availability and fault tolerance for its application. Which architecture would best support these requirements while minimizing costs?

Accepted Answer

Deploy the web server and application server in an Auto Scaling group across multiple Availability Zones, and use Amazon RDS with Multi-AZ deployment for the database server.

Question 30

In a microservices architecture deployed on AWS, a developer is tasked with implementing a solution that ensures high availability and fault tolerance for a critical application. The application consists of multiple microservices that communicate with each other via REST APIs. The developer needs to choose an appropriate AWS service to manage the API traffic while ensuring that the application can scale automatically based on demand. Which AWS service should the developer utilize to achieve this goal?

Accepted Answer

Amazon API Gateway

Amazon DVA-C02 AWS Certified Developer – Associate (DVA-C02) Free Practice Test — 30 Questions

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