Hey folks, welcome to our Docker Certified Associate Exam Practice Test. It’s like a mini-exam designed to help you prepare for the real deal and boost your confidence!
The Docker Certified Associate exam is about showing you know your stuff with Docker, a tool that lets developers create, deploy, and run applications in containers easily. It’s a big deal in software development because it helps keep apps running smoothly no matter where they are.
Below are 25 multiple-choice practice questions that will help you prepare for the DCA exam. Each question has an answer and a brief explanation to enhance your understanding. Let’s get started!
1. Which Docker command is used to create a new container?
Answer:
Explanation:
The docker run command is used to create a new container from an image and start it.
2. What does the -p flag do in the docker run command?
Answer:
Explanation:
The -p flag in the docker run command is used to publish a container’s port to the host, allowing external access.
3. What is the primary purpose of Docker Compose?
Answer:
Explanation:
Docker Compose is used primarily to define and run multi-container Docker applications, specifying services, networks, and volumes in a docker-compose.yml file.
4. Which of the following is a storage driver in Docker?
Answer:
Explanation:
overlay2 is a storage driver used by Docker to manage container images and the container layer on the host.
5. Which command is used to remove Docker images?
Answer:
Explanation:
The docker rmi command is used to remove one or more Docker images from the host machine.
6. Which Docker network type provides complete isolation for containers?
Answer:
Explanation:
The none network provides complete isolation for containers, with no external network access.
7. How do you connect a Docker container to a specific network?
Answer:
Explanation:
The docker network connect command is used to connect a running container to a specific network.
8. Which of the following is true about Docker Bridge Network?
Answer:
Explanation:
In a Docker Bridge Network, containers on the same network can communicate using IP addresses, but additional configuration is required for communication between different Bridge Networks or hosts.
9. What is the default network mode for a Docker container?
Answer:
Explanation:
By default, Docker containers are created using the Bridge network mode.
10. How can you restrict the traffic between containers on the same Docker network?
Answer:
Explanation:
Network policies in Docker can be used to control and restrict the traffic between containers on the same network.
11. What is the purpose of Docker Volumes?
Answer:
Explanation:
Docker Volumes are used to persist data generated by and used by Docker containers, ensuring that the data outlives the container.
12. Which Docker command is used to list all the volumes?
Answer:
Explanation:
The docker volume ls command is used to list all Docker volumes on the host machine.
13. How can you backup the data of a Docker container?
Answer:
Explanation:
The docker cp command can be used to copy files or directories between a container and the local filesystem, which can be helpful for backing up data.
14. What is the advantage of using Docker named volumes over bind mounts?
Answer:
Explanation:
Named volumes are managed by Docker and are easier to manage, backup, and migrate compared to bind mounts.
15. Which Docker command is used to inspect the details of a volume?
Answer:
Explanation:
The docker volume inspect command is used to display detailed information about one or more volumes.
16. What is the purpose of Docker Swarm?
Answer:
Explanation:
Docker Swarm is an orchestration tool used to deploy, scale, and manage Docker services across multiple Docker hosts.
17. How can you scale a Docker service in Docker Swarm?
Answer:
Explanation:
You can scale a Docker service in Docker Swarm using either the docker service update –replicas command or the docker service scale command.
18. What is the role of a manager node in Docker Swarm?
Answer:
Explanation:
In Docker Swarm, manager nodes are responsible for scheduling services and can also execute services, unlike worker nodes, which only execute services.
19. How do you deploy a stack in Docker Swarm?
Answer:
Explanation:
The docker stack deploy command is used to deploy a new stack or update an existing stack based on the services defined in a docker-compose.yml file.
20. Which of the following is a valid Docker Swarm service update strategy?
Answer:
Explanation:
Docker Swarm supports the Rolling update strategy to update services progressively without downtime.
21. How can you enable Docker Content Trust (DCT)?
Answer:
Explanation:
Docker Content Trust (DCT) can be enabled by setting the DOCKER_CONTENT_TRUST environment variable to 1.
22. Which Docker command is used to view the security scan results of an image?
Answer:
Explanation:
The docker scan command is used to view the security scan results of a Docker image.
23. How can you sign a Docker image?
Answer:
Explanation:
Docker images can be signed using Docker Content Trust (DCT) to ensure image integrity and publisher authenticity.
24. What is the purpose of Docker Secrets?
Answer:
Explanation:
Docker Secrets is a feature designed to manage sensitive data such as passwords, API keys, and other secrets in a secure way.
25. How can you limit the system resources used by a Docker container?
Answer:
Explanation:
System resources like CPU and memory used by a Docker container can be limited using the –cpus and –memory flags with the docker run command.
This practice test is intended to help you prepare for the Docker Certified Associate exam. Reviewing these questions and understanding the explanations will deepen your knowledge and readiness for the test. We wish you all the best in your certification journey!