Amazon DOP-C02 AWS DevOps Engineer Professional (DOP-C02) Free Practice Test — 30 Questions

Question 1

In a scenario where a company is using AWS CDK to deploy a serverless application, the development team needs to create a Lambda function that processes incoming data from an S3 bucket. They want to ensure that the Lambda function has the necessary permissions to read from the S3 bucket and log its activities to CloudWatch. Which of the following approaches would best achieve this while adhering to the principle of least privilege?

Accepted Answer

Create an IAM role for the Lambda function that grants it permissions to read from the specific S3 bucket and write logs to CloudWatch, and attach this role to the Lambda function during its creation in the CDK stack.

Question 2

A company is using AWS Systems Manager to manage its fleet of EC2 instances across multiple regions. They want to ensure that all instances are compliant with their security policies, which include specific configurations for the operating system and installed software. The company has set up a compliance framework using Systems Manager\'s State Manager and Patch Manager. If they want to evaluate the compliance of their instances against these policies, which approach should they take to ensure a comprehensive assessment of their instances\' configurations and patch levels?

Accepted Answer

Use Systems Manager Inventory to collect metadata about the instances and then run a compliance report based on the collected data.

Question 3

In a microservices architecture deployed on AWS, a company is using AWS Fargate to run containerized applications. They have defined a task that requires a specific amount of CPU and memory resources. The task is expected to handle variable workloads, with peak usage reaching 80% of the allocated resources. If the task is defined with 2 vCPUs and 4 GB of memory, what is the maximum CPU and memory utilization in terms of percentage when the task is running at peak usage?

Accepted Answer

80% CPU and 80% Memory

Question 4

A company has implemented AWS CloudTrail to monitor API calls across its AWS account. They have configured CloudTrail to log events in a specific S3 bucket. The security team wants to ensure that the logs are not tampered with and that they can verify the integrity of the logs over time. Which of the following strategies should the company implement to achieve this goal?

Accepted Answer

Enable S3 Object Lock in compliance mode for the CloudTrail logs bucket.

Question 5

A company is deploying a new microservices architecture on AWS and needs to ensure that their services can scale automatically based on demand. They are considering using Amazon ECS with Fargate for container orchestration. Which combination of AWS services and configurations would best enable this automatic scaling while ensuring cost efficiency and high availability?

Accepted Answer

Use Amazon CloudWatch for monitoring, set up Auto Scaling policies for ECS services, and configure Application Load Balancer (ALB) for traffic distribution.

Question 6

A company is deploying a new microservices architecture on AWS, utilizing Elastic Container Service (ECS) for container orchestration. They have multiple environments (development, testing, and production) and want to ensure that each environment is isolated and has its own configuration settings. The team decides to use AWS Systems Manager Parameter Store to manage environment-specific configurations. If the development environment requires a database connection string that differs from the production environment, how should the team structure their parameters in Parameter Store to ensure clarity and maintainability?

Accepted Answer

Use a hierarchical naming convention such as `/dev/db/connectionString` and `/prod/db/connectionString` for the parameters.

Question 7

A company has been allocated the IP address block 192.168.1.0/24 for its internal network. The network administrator needs to create 4 subnets for different departments: HR, IT, Sales, and Marketing. Each department requires at least 30 hosts. What subnet mask should the administrator use to accommodate these requirements, and what will be the range of IP addresses for the HR department?

Accepted Answer

255.255.255.192; Range: 192.168.1.1 - 192.168.1.62

Question 8

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 in a specific order, where the application server must be started only after the database server is fully operational. To achieve this, they decide to use the `DependsOn` attribute in their CloudFormation template. Which of the following statements best describes the implications of using the `DependsOn` attribute in this scenario?

Accepted Answer

The `DependsOn` attribute ensures that the application server will only be created after the database server has been successfully created and is in the "running" state, preventing race conditions during stack creation.

Question 9

A company is planning to deploy a new microservices architecture on AWS using Elastic Kubernetes Service (EKS). They need to define the build specifications for their CI/CD pipeline to ensure that each microservice is built, tested, and deployed efficiently. The build specification must include steps for installing dependencies, running tests, and packaging the application. Given the following build specification steps, which one would be the most effective to ensure that the microservices are built correctly and can be deployed seamlessly?

Accepted Answer

Install dependencies, run unit tests, build Docker images, push to ECR, deploy to EKS

Question 10

A software development team is experiencing intermittent failures in their CI/CD pipeline, particularly during the deployment phase. The team has implemented automated tests, but they are not consistently catching issues that arise in production. To address this, the team decides to enhance their debugging techniques. Which approach would most effectively help the team identify the root cause of the deployment failures and improve the reliability of their CI/CD pipeline?

Accepted Answer

Implementing comprehensive logging and monitoring throughout the pipeline to capture detailed information about each step and its outcomes.

Question 11

A company is developing a serverless application using AWS Step Functions to orchestrate a series of AWS Lambda functions that process data from an S3 bucket. The workflow consists of three steps: first, a Lambda function retrieves data from S3, second, another Lambda function processes the data, and finally, a third Lambda function stores the processed data back into S3. The company wants to ensure that if any step fails, the workflow can be retried up to three times before it is marked as failed. Additionally, they want to implement a mechanism to log the errors encountered during each step. Which configuration should the company implement in their Step Functions state machine definition to achieve this?

Accepted Answer

Use the "Retry" field in each state definition to specify the maximum attempts and add a "Catch" field to log errors.

Question 12

A company is deploying a new version of its application using AWS CodeDeploy. The deployment strategy chosen is a blue/green deployment. The application has two environments: the blue environment is currently live, and the green environment is being prepared for the new version. The deployment process involves several steps, including creating a new revision, updating the deployment group, and monitoring the deployment status. If the deployment fails, the company wants to roll back to the previous version automatically. Which of the following statements best describes the key components and considerations involved in this deployment strategy?

Accepted Answer

The blue/green deployment strategy allows for seamless transitions between application versions, minimizing downtime and enabling automatic rollback through AWS CodeDeploy's built-in features.

Question 13

A company is running a web application on AWS that experiences fluctuating traffic patterns throughout the day. They have implemented Auto Scaling to manage their EC2 instances. The application requires a minimum of 2 instances to handle the baseline load, but during peak hours, it can scale up to a maximum of 10 instances. The company has set the following scaling policies: a scale-out policy that triggers when CPU utilization exceeds 70% for 5 consecutive minutes, and a scale-in policy that triggers when CPU utilization drops below 30% for 10 consecutive minutes. If the current CPU utilization is at 75% and the Auto Scaling group has 4 instances running, how many instances will the Auto Scaling group scale up to after the scale-out policy is triggered?

Accepted Answer

5 instances

Question 14

A company is developing a microservices architecture on AWS and needs to securely manage sensitive information such as API keys and database credentials. They decide to use AWS Secrets Manager for this purpose. The company has multiple environments (development, testing, and production) and wants to ensure that secrets are rotated automatically to enhance security. Which of the following strategies should the company implement to effectively manage secrets across these environments while ensuring compliance with security best practices?

Accepted Answer

Use AWS Secrets Manager to store secrets for each environment separately, configure automatic rotation for each secret, and apply IAM policies to restrict access based on the environment.

Question 15

In a microservices architecture, a company is implementing a workflow orchestration tool to manage the interactions between various services. The orchestration tool needs to handle a sequence of tasks that include data retrieval, processing, and storage. Given that the data retrieval service takes an average of 2 seconds to respond, the processing service takes 5 seconds, and the storage service takes 3 seconds, what is the total expected time for a complete workflow execution if the orchestration tool is designed to execute these tasks sequentially? Additionally, if the orchestration tool introduces an overhead of 1 second for each task transition, what is the overall time taken for the entire workflow?

Accepted Answer

16 seconds

Question 16

A financial services company operates a critical application that processes transactions in real-time. To ensure high availability and disaster recovery, the company has implemented a multi-region architecture on AWS. They have set up an active-active configuration across two regions, where both regions handle traffic simultaneously. However, they are concerned about the potential data inconsistency that may arise due to the eventual consistency model of certain AWS services. To mitigate this risk, they are considering implementing a solution that involves synchronous replication of their databases across both regions. Which of the following strategies would best address their concerns while maintaining high availability?

Accepted Answer

Implement Amazon Aurora Global Database with cross-region replication.

Question 17

A company is deploying a highly available web application using AWS services. They decide to use a Network Load Balancer (NLB) to distribute incoming traffic across multiple EC2 instances in different Availability Zones (AZs). The application is expected to handle a peak load of 10,000 requests per second (RPS). Each EC2 instance can handle 500 RPS before reaching its maximum capacity. To ensure optimal performance and fault tolerance, the company wants to determine the minimum number of EC2 instances required across the AZs. Additionally, they want to ensure that the load balancer can handle sudden spikes in traffic, which could increase the load by 20% during peak hours. What is the minimum number of EC2 instances the company should provision to meet these requirements?

Accepted Answer

12

Question 18

In a software development project, a team is using Agile methodologies to manage their tasks. They have a total of 120 story points to complete in a sprint that lasts for 3 weeks. The team consists of 6 members, each capable of completing an average of 5 story points per week. However, due to unforeseen circumstances, one team member is expected to be unavailable for the entire sprint. Given this situation, how many story points can the team realistically complete by the end of the sprint, and what implications does this have for project management and collaboration within the team?

Accepted Answer

90 story points

Question 19

A company is planning to segment its network into multiple subnets to improve security and performance. They have been allocated the IP address block of 192.168.1.0/24. The network administrator decides to create four equal-sized subnets. What will be the subnet mask for each of these subnets, and how many usable IP addresses will each subnet contain?

Accepted Answer

Subnet mask: 255.255.255.192; Usable IPs: 62

Question 20

In a Kubernetes environment, you are tasked with managing a deployment that consists of multiple pods running a web application. The application needs to handle varying levels of traffic throughout the day. To ensure high availability and efficient resource utilization, you decide to implement Horizontal Pod Autoscaling (HPA). Given that the current configuration allows for a minimum of 2 replicas and a maximum of 10 replicas, and the average CPU utilization threshold is set to 70%, how would you determine the number of replicas that should be running if the current average CPU utilization is 85%? Additionally, consider that each pod requires 200m CPU and the cluster has a total of 2 CPUs available. What is the maximum number of replicas that can be effectively deployed without exceeding the cluster\'s CPU limits?

Accepted Answer

10 replicas

Question 21

A company has deployed a microservices architecture on AWS, utilizing AWS Lambda functions and Amazon API Gateway. They are experiencing latency issues and want to analyze the performance of their application. The development team decides to implement AWS X-Ray to gain insights into the request flow and identify bottlenecks. After enabling X-Ray, they notice that some requests are taking significantly longer than others. What steps should the team take to effectively utilize AWS X-Ray for diagnosing these latency issues?

Accepted Answer

Enable tracing for all Lambda functions and configure sampling rules to capture a representative subset of requests.

Question 22

A company is deploying a new version of its application using a rolling update strategy on an Amazon Elastic Kubernetes Service (EKS) cluster. The application consists of three microservices: A, B, and C. Each microservice has a different number of replicas: A has 5 replicas, B has 3 replicas, and C has 4 replicas. The deployment strategy is configured to update one replica at a time for each microservice. If the update process starts at 10:00 AM and takes 2 minutes to update each replica, what time will the rolling update for all microservices be completed?

Accepted Answer

0.44027777777777777

Question 23

A software development team is tasked with creating a library for a new application that requires efficient data retrieval and storage. The team decides to implement a caching mechanism to enhance performance. They need to choose between different caching strategies: in-memory caching, distributed caching, and persistent caching. Given the requirements of high-speed access and the need to handle a large volume of requests, which caching strategy would be the most effective for their library, considering both performance and scalability?

Accepted Answer

In-memory caching

Question 24

A company is deploying a microservices architecture using Amazon ECS to manage its containerized applications. The architecture consists of multiple services that need to communicate with each other securely. The company wants to implement a solution that allows for service discovery and load balancing while ensuring that the communication between services is encrypted. Which combination of AWS services and features should the company utilize to achieve this goal effectively?

Accepted Answer

AWS App Mesh with Amazon ECS and Application Load Balancer

Question 25

A company is implementing AWS Chatbot to enhance their DevOps processes by integrating notifications from AWS services into their Slack channels. They want to ensure that the chatbot can respond to specific commands and provide relevant information based on the context of the conversation. Which of the following configurations is essential for the AWS Chatbot to effectively process and respond to commands in a Slack channel?

Accepted Answer

Configuring IAM roles with the necessary permissions for AWS Chatbot to access AWS services and resources.

Question 26

A software development team is using AWS CodeBuild to automate their build process. They have a build project configured to use a specific Docker image that contains all the necessary dependencies for their application. The team wants to optimize their build times and reduce costs. They are considering two strategies: enabling build caching and using a smaller Docker image. Which combination of strategies would most effectively reduce build times and costs, and what are the implications of each choice?

Accepted Answer

Enable build caching and use a smaller Docker image

Question 27

A software development team is implementing a CI/CD pipeline using AWS CodePipeline to automate their deployment process. They have multiple stages in their pipeline, including source, build, test, and deploy. The team wants to ensure that the deployment only occurs if all tests pass successfully. Additionally, they want to implement a manual approval step before the deployment stage to ensure that the code meets quality standards. Given this scenario, which configuration would best achieve these requirements while maintaining a streamlined workflow?

Accepted Answer

Configure the pipeline to include a manual approval action before the deploy stage, and set the test stage to fail the pipeline if any tests do not pass.

Question 28

In a large-scale e-commerce platform, the operations team is implementing an AIOps solution to enhance incident management and reduce downtime. They are considering various machine learning models to predict system failures based on historical data. The team has collected data on system metrics such as CPU usage, memory consumption, and network latency over the past year. They want to use a supervised learning approach to classify incidents as either \'critical\' or \'non-critical\'. Given that the dataset is imbalanced, with only 10% of incidents classified as \'critical\', which of the following strategies would best improve the model\'s performance in this scenario?

Accepted Answer

Implementing SMOTE (Synthetic Minority Over-sampling Technique) to balance the dataset before training the model.

Question 29

A software development team is implementing a CI/CD pipeline using Jenkins and GitHub Actions to automate their deployment process. They want to ensure that their builds are triggered automatically whenever a new commit is pushed to the main branch of their GitHub repository. Additionally, they need to integrate a testing framework that runs unit tests before the deployment stage. Which configuration approach should the team adopt to achieve this seamless integration and ensure that the testing framework is executed correctly before deployment?

Accepted Answer

Configure a webhook in GitHub to trigger a Jenkins job that runs the testing framework, followed by the deployment process if tests pass.

Question 30

A company is using Amazon CloudFront to distribute content globally. They have set up a distribution with multiple origins, including an S3 bucket for static assets and an EC2 instance for dynamic content. The company wants to optimize the performance of their CloudFront distribution by implementing caching strategies. They decide to configure cache behaviors based on the path patterns of the requests. If the company wants to ensure that requests for static assets are cached for a longer duration compared to dynamic content, which of the following configurations would best achieve this goal?

Accepted Answer

Set a longer TTL (Time to Live) for the cache behavior associated with the S3 bucket and a shorter TTL for the cache behavior associated with the EC2 instance.

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