Docker Quiz Test Online (30 random Questions) 2025

This quick 30-minute challenge consists of 30 random multiple-choice questions that test your knowledge across various Docker topics, including the introduction to Docker, installation procedures, Docker images and containers, networking, Docker Compose, advanced concepts, deployment in production, security, and integration with CI/CD pipelines. Whether you’re a beginner or have some experience, this quiz is designed to enhance your understanding of Docker’s capabilities in modern software development.

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30 Minutes Docker Quiz Test Online

Welcome to the Docker Quiz! This quick 30-minute challenge consists of 30 random multiple-choice questions that test your knowledge across various Docker topics, including the introduction to Docker, installation procedures, Docker images and containers, networking, Docker Compose, advanced concepts, deployment in production, security, and integration with CI/CD pipelines. Whether you're a beginner or have some experience, this quiz is designed to enhance your understanding of Docker's capabilities in modern software development.

1 / 30

1. Which feature in Docker provides secure image signing and verification?

A) Docker Security Scanner

B) Content Trust

C) Docker Shield

D) Image Lock

2 / 30

2. Which network driver is used for communication between containers on the same host by default?

A) Bridge

B) Host

C) Overlay

D) None

3 / 30

3. Which file format is typically used to define CI/CD pipelines in GitLab CI/CD?

A) pipeline.yml

B) config.json

C) docker-compose.yml

D) gitlab-ci.yml

4 / 30

4. How do you specify a custom subnet when creating a Docker network?

A) docker network create --ip-range=<subnet>

B) docker network create --subnet=<subnet>

C) docker network create --mask=<subnet>

D) docker network create --cidr=<subnet>

5 / 30

5. What is Docker Swarm?

A) A Kubernetes alternative for managing containers

B) A feature for securing Docker containers

C) A tool for building multi-stage images

D) Docker's native clustering and orchestration tool

6 / 30

6. What is the primary purpose of the ENTRYPOINT instruction in a Dockerfile?

A) ENTRYPOINT provides default commands

B) ENTRYPOINT defines executable instructions

C) ENTRYPOINT sets the base image

D) ENTRYPOINT is for environment variables

7 / 30

7. What is the best way to monitor container resource usage in production?

A) Using monitoring tools like cAdvisor or Prometheus

B) Using built-in Docker commands

C) Relying on container logs

D) Avoiding resource limits

8 / 30

8. What is a dangling image in Docker?

A) An image with vulnerabilities

B) An image with large size

C) An image stored in a remote registry

D) An image with no associated tag

9 / 30

9. What role does Docker Swarm play in a CI/CD pipeline?

A) Orchestrating containers for deployment

B) Storing container logs

C) Building Docker images

D) Monitoring containers

10 / 30

10. What is the purpose of the docker-compose plugin during installation?

A) To manage single-container applications

B) To debug Docker containers

C) To manage multi-container applications

D) To update Docker images

11 / 30

11. Which command is used to prune unused volumes in Docker?

A) docker clean volumes

B) docker volume prune

C) docker system prune

D) docker volume cleaD

12 / 30

12. Which command displays container resource usage statistics?

A) docker inspect

B) docker logs

C) docker monitor

D) docker stats

13 / 30

13. Why should you use minimal base images like alpine?

A) To avoid multi-stage builds

B) To reduce image build time

C) To ensure compatibility with all applications

D) To minimize the attack surface

14 / 30

14. What does the FROM instruction in a Dockerfile do?

A) Specifies the base image for the new Docker image

B) Copies files to the container

C) Starts a new container

D) Sets the working directory in the container

15 / 30

15. What does the docker-compose up command do in a CI/CD process?

A) Pulls images from the Docker registry

B) Starts and runs all services defined in a Compose file

C) Builds Docker images only

D) Stops all running containers

16 / 30

16. What is the role of --internal in Docker networks?

A) It allows containers to bypass the DNS.

B) It prevents external access to the network.

C) It enables encrypted communication.

D) It connects containers across hosts.

17 / 30

17. Which command lists all the locally available Docker images?

A) docker images

B) docker ls

C) docker inspect

D) docker ps

18 / 30

18. Which command is used to build a Docker image from a Dockerfile?

A) docker build

B) docker image

C) docker create

D) docker run

19 / 30

19. What is the base image in Docker?

A) The default image used for all containers

B) A custom-built image from scratch

C) The first layer of any Docker image

D) An empty Docker container

20 / 30

20. What does the --no-cache flag do during docker build?

A) Skips Dockerfile validation

B) Builds without using cached layers

C) Cleans up image cache after building

D) Disables multi-stage builds

21 / 30

21. Which of the following tools can help enforce Docker image security policies?

A) Kubernetes

B) Docker Content Trust

C) Docker Compose

D) Jenkins

22 / 30

22. Which command is used to pause all running containers in Docker Compose?

A) docker-compose pause

B) docker-compose suspend

C) docker-compose hold

D) docker-compose stop

23 / 30

23. Which command optimizes the size of a Docker image by removing intermediate layers?

A) docker optimize

B) docker build --squash

C) docker image clean

D) docker prune

24 / 30

24. What is Docker Compose used for?

A) Building Docker images

B) Defining and running multi-container Docker applications

C) Debugging Docker containers

D) Managing container networking

25 / 30

25. How do you tag a Docker image during the build process?

A) By using the -name flag

B) By using the --image flag

C) By using the -t flag

D) By renaming the Dockerfile

26 / 30

26. Which command is commonly used to build a Docker image in a CI/CD pipeline?

A) docker ps

B) docker build

C) docker run

D) docker pull

27 / 30

27. What is the primary goal of using Docker in production?

A) To streamline and standardize deployments

B) To develop code faster

C) To replace virtual machines entirely

D) To save disk space

28 / 30

28. What does Docker Content Trust (DCT) provide?

A) A logging framework for containers

B) Resource monitoring tools

C) Encryption for container logs

D) Image signing and verification

29 / 30

29. What is Docker Hub?

A) A tool for monitoring Docker containers

B) A command-line interface for Docker

C) A physical server for storing Docker data

D) A cloud-based registry for Docker images

30 / 30

30. Which command updates a running service in Docker Compose?

A) docker-compose restart

B) docker-compose redeploy

C) docker-compose up

D) docker-compose update

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