Docker Quiz Test Online (30 random Questions) 2026

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 protocol is primarily used by Docker for container communication?

A) IP

B) TCP

C) HTTP

D) UDP

2 / 30

2. What is Docker Compose used for?

A) Building Docker images

B) Debugging Docker containers

C) Managing container networking

D) Defining and running multi-container Docker applications

3 / 30

3. What is an "overlay network" in Docker?

A) A deprecated network type

B) A network that connects multiple Docker daemons across hosts

C) A private network for internal Docker use

D) A network that operates only on a single host

4 / 30

4. What does the docker secret command manage in a Docker Swarm?

A) Multi-stage build configurations

B) API keys for Kubernetes

C) Encrypted secrets for services

D) TLS certificates

5 / 30

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

A) Disables multi-stage builds

B) Skips Dockerfile validation

C) Cleans up image cache after building

D) Builds without using cached layers

6 / 30

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

A) ENTRYPOINT sets the base image

B) ENTRYPOINT provides default commands

C) ENTRYPOINT defines executable instructions

D) ENTRYPOINT is for environment variables

7 / 30

7. What is the purpose of the docker stack deploy command?

A) To deploy services in a Docker Swarm cluster

B) To create a multi-stage Dockerfile

C) To initialize Docker networking

D) To deploy a stack of containers

8 / 30

8. What is the size of the default Docker Desktop installation?

A) ~1 GB

B) ~2 GB

C) ~200 MB

D) ~400 MB

9 / 30

9. What file is used to build a Docker image?

A) Dockerfile

B) ImageConfig

C) DockerConfig.json

D) ImageBuilder

10 / 30

10. Which network driver disables all networking for a container?

A) None

B) Overlay

C) Bridge

D) Host

11 / 30

11. What is the primary purpose of Docker volumes?

A) To manage network configurations

B) To provide persistent storage for containers

C) To monitor container performance

D) To share images between containers

12 / 30

12. How can Docker containers achieve high availability in production?

A) By avoiding orchestration tools

B) By sharing the same network

C) Using a single host for all containers

D) Using container restart policies

13 / 30

13. What is the role of the --cache-from flag in Docker build commands?

A) To use cached layers from a previous build

B) To build multi-stage images

C) To scan images for vulnerabilities

D) To clear image cache

14 / 30

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

A) docker ls

B) docker inspect

C) docker images

D) docker ps

15 / 30

15. What is the default port used by Docker Daemon?

A) 8080

B) 22

C) 2375

D) 443

16 / 30

16. What is the default logging driver in Docker?

A) syslog

B) JSON-file

C) Journald

D) Fluentd

17 / 30

17. What happens if you try to remove a running container?

A) The container is forcefully stopped and removed.

B) Docker archives the container.

C) The container is removed without stopping it.

D) Docker throws an error.

18 / 30

18. What is the purpose of the -P flag in the docker run command?

A) To publish ports explicitly

B) To pause the container after running

C) To enable port forwarding

D) To automatically map container ports to random host ports

19 / 30

19. Which network driver allows a container to share the host's network namespace?

A) Bridge

B) Host

C) Overlay

D) None

20 / 30

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

A) By using the -t flag

B) By renaming the Dockerfile

C) By using the -name flag

D) By using the --image flag

21 / 30

21. How do you specify environment variables in a Docker Compose file?

A) Using the variables key

B) Using the env key

C) Using the config key

D) Using the environment key

22 / 30

22. How do you enable Docker Swarm mode?

A) docker swarm init

B) docker mode activate

C) docker swarm create

D) docker cluster enable

23 / 30

23. Which package manager is used to install Docker on Red Hat-based systems?

A) zypper

B) pacman

C) apt

D) yum

24 / 30

24. How do you execute a command inside a running container managed by Docker Compose?

A) docker attach

B) docker exec

C) docker-compose exec

D) docker-compose run

25 / 30

25. What is the default network type created when Docker is installed?

A) Bridge

B) Host

C) Overlay

D) None

26 / 30

26. How do you attach to a running container?

A) docker connect <container-id>

B) docker join <container-id>

C) docker exec -it <container-id>

D) docker attach <container-id>

27 / 30

27. How does Docker simplify CI/CD pipelines?

A) By reducing the need for code reviews

B) By replacing version control systems

C) By providing consistent environments for development, testing, and production

D) By eliminating the need for orchestration tools

28 / 30

28. What is the purpose of the docker network create command?

A) To connect a container to a network

B) To create a container

C) To list all networks

D) To create a new network

29 / 30

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

A) docker-compose stop

B) docker-compose hold

C) docker-compose suspend

D) docker-compose pause

30 / 30

30. What is the main purpose of resource limits in Docker?

A) To encrypt communication between containers

B) To prevent container logs from exceeding a size limit

C) To ensure fair resource allocation across containers

D) To reduce image size

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