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. How do you publish a container port to the host system?

A) By modifying the Dockerfile

B) Using the --dns flag in docker run

C) Using the --expose flag in docker run

D) Using the -p or --publish flag in docker run

2 / 30

2. Which protocol is primarily used by Docker for container communication?

A) UDP

B) IP

C) TCP

D) HTTP

3 / 30

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

A) docker-compose run

B) docker attach

C) docker exec

D) docker-compose exec

4 / 30

4. What does Docker use to optimize image layers?

A) Hypervisor technology

B) Virtual memory

C) Volume mapping

D) Layer caching

5 / 30

5. What is the default user inside a Docker container?

A) Root

B) Admin

C) Docker

D) System

6 / 30

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

A) To list all networks

B) To connect a container to a network

C) To create a container

D) To create a new network

7 / 30

7. Which of the following is NOT a component of Docker architecture?

A) Virtual Machine Manager

B) Docker Engine

C) Docker CLI

D) Docker Daemon

8 / 30

8. What is the purpose of the docker system prune command?

A) To reset the Docker daemon

B) To clean up unused volumes only

C) To optimize container resource usage

D) To remove unused images, containers, and networks

9 / 30

9. What happens if Docker is installed on a system without enough disk space?

A) Docker will disable image caching.

B) Docker will install but fail to run containers.

C) Docker will prompt for manual disk space allocation.

D) Docker will refuse to install.

10 / 30

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

A) zypper

B) yum

C) apt

D) pacman

11 / 30

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

A) docker ps

B) docker run

C) docker build

D) docker pull

12 / 30

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

A) docker build --squash

B) docker prune

C) docker image clean

D) docker optimize

13 / 30

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

A) To ensure fair resource allocation across containers

B) To encrypt communication between containers

C) To reduce image size

D) To prevent container logs from exceeding a size limit

14 / 30

14. Which command inspects the IP address of a running container?

A) docker network ip

B) docker inspect <container>

C) docker ps

D) docker ip <container>

15 / 30

15. What does the -d option in the docker run command do?

A) Deletes the container after it stops

B) Stops the container after execution

C) Runs the container in detached mode

D) Runs the container in interactive mode

16 / 30

16. Which of the following best describes a Dockerfile?

A) A log file for tracking container events

B) A configuration file for Docker CLI

C) A template for creating Docker images

D) A script for managing Docker networks

17 / 30

17. What is the default working directory inside a container?

A) /root

B) /home

C) /var

D) / (root directory)

18 / 30

18. 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

19 / 30

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

A) To clear image cache

B) To build multi-stage images

C) To scan images for vulnerabilities

D) To use cached layers from a previous build

20 / 30

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

A) Encryption for container logs

B) Image signing and verification

C) A logging framework for containers

D) Resource monitoring tools

21 / 30

21. What is the main use case for the --link flag in Docker?

A) Connecting containers on different networks

B) Connecting containers for legacy applications

C) Creating a new network

D) Encrypting container communication

22 / 30

22. Which networking option allows containers on separate hosts to communicate in a Swarm?

A) Overlay Network

B) None of the above

C) Host Network

D) Bridge Network

23 / 30

23. What was Docker originally called during its development?

A) dotContainer

B) dotCloud

C) The Docker Project

D) Container Engine

24 / 30

24. In which year was Docker initially released?

A) 2015

B) 2011

C) 2013

D) 2017

25 / 30

25. How do you uninstall Docker on Linux?

A) yum remove docker

B) Both B and C

C) docker uninstall

D) apt-get remove docker-ce

26 / 30

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

A) Bridge

B) Host

C) Overlay

D) None

27 / 30

27. Which flag is used with docker-compose up to recreate containers even if they already exist?

A) --recreate

B) --force

C) --reset

D) --build

28 / 30

28. What is the default Docker image registry?

A) Azure Container Registry

B) Google Container Registry

C) Docker Hub

D) AWS Elastic Container Registry

29 / 30

29. What is the purpose of the EXPOSE instruction in a Dockerfile?

A) To specify ports the container listens on

B) To publish ports for the container

C) To block all ports of the container

D) To map container ports to the host machine

30 / 30

30. Which tool is used to resolve container names to IP addresses in Docker?

A) Network manager

B) DNS server

C) Bridge resolver

D) Docker DNS

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