--- title: "Docker: Containerization Fundamentals" lang: "en" author: "Mohammad Abu Mattar" canonical: https://mkabumattar.com/post/docker-containerization-fundamentals-quiz --- [Home](/)›[Quizzes](/quizzes)›[All Categories](/quizzes/categories)›[Docker](/quizzes/categories/docker) Quizzes [Docker](/quizzes/categories/docker)[Containerization](/quizzes/categories/containerization)[DevOps](/quizzes/categories/devops)[Cloud Native](/quizzes/categories/cloud-native) # Docker: Containerization Fundamentals [Mohammad Abu Mattar](/authors/mohammad-abu-mattar)20 QuestionsIntermediatePublished: 28 Jan 2026 [Markdown for AI(opens in a new tab)](/post/docker-containerization-fundamentals-quiz/index.md "Open the plain-Markdown version of this page, for pasting into an AI tool") Series [Containers & Kubernetes](/series/containers--kubernetes)1/5 [NextKubernetes: Container Orchestration Essentials](/quizzes/post/kubernetes-orchestration-essentials-quiz) All posts in this series (5) Quizzes5 1. [Docker: Containerization FundamentalsYou are here](/quizzes/post/docker-containerization-fundamentals-quiz) 2. [Kubernetes: Container Orchestration Essentials](/quizzes/post/kubernetes-orchestration-essentials-quiz) 3. [Helm: Kubernetes Package Management Essentials](/quizzes/post/helm-kubernetes-package-management-quiz) 4. [Istio: Service Mesh Fundamentals](/quizzes/post/istio-service-mesh-fundamentals-quiz) 5. [Kubernetes Advanced: Production Operations & Scaling](/quizzes/post/kubernetes-advanced-quiz) ## Docker: Containerization Fundamentals Up to 20 questions, shuffled on every run Quiz Configuration Enterto start Welcome to the Docker Basics Quiz! This quiz covers fundamental Docker concepts, containerization, and best practices. Each question is multiple-choice, and you’ll find hints to help you along the way. Good luck! Answer key and explanations20 questions The quiz above draws 20 questions at random from these 30, so a second attempt will not be the same run. Everything in the pool is listed here. 1. Which Dockerfile instruction specifies the base image for a new container? Answer\`FROM\` 2. Which command is used to build an image from a Dockerfile? Answer\`docker build\` 3. What is the primary difference between CMD and ENTRYPOINT? Answer\`ENTRYPOINT\` sets the executable; \`CMD\` sets default arguments 4. Which command displays the list of currently running containers? Answer\`docker ps\` 5. What does the -d flag do when running a container? AnswerStarts the container in detached background mode 6. Which instruction allows you to set environmental variables within a Dockerfile? Answer\`ENV\` 7. What is a Docker "Layer"? AnswerA read-only filesystem change from a command 8. How do you stop all running Docker containers at once? Answer\`docker stop $(docker ps -q)\` 9. Which Docker network driver is the default for standalone containers? Answer\`Bridge\` 10. What is the purpose of a Docker ".dockerignore" file? AnswerExcludes local files from being sent to the build context 11. Which command allows you to enter a running container and start a shell? Answer\`docker exec -it /bin/bash\` 12. What is the command to delete a specific Docker image? Answer\`docker rmi\` 13. What is a "Volume" in Docker? AnswerA persistent storage area managed by Docker 14. In "docker run -p 8080:80 nginx", which port is the host port? Answer8080 15. Which instruction defines the directory where subsequent commands will be executed? Answer\`WORKDIR\` 16. What is "Multi-stage building"? AnswerUsing separate stages to reduce final image size 17. Which command is used to see the metadata (IP, Config, etc.) of a container? Answer\`docker inspect\` 18. What is the purpose of "Docker Hub"? AnswerA public registry for sharing container images 19. What is "Copy-on-Write" (CoW)? AnswerA strategy that copies files only when modified 20. Which command pulls an image from a registry without running it? Answer\`docker pull\` 21. What does "docker system prune" do? AnswerRemoves unused data like stopped containers 22. Which Dockerfile instruction is used to document intended ports? Answer\`EXPOSE\` 23. What is a "Dangling Image"? AnswerAn image that has no name tag or reference 24. Which command starts a previously stopped container? Answer\`docker start\` 25. What is the default user in most Docker images if not specified? Answer\`root\` 26. Which command logs you into a Docker registry? Answer\`docker login\` 27. What is Docker Compose used for? AnswerRunning multi-container apps using YAML files 28. Which flag is used to name a container during "docker run"? Answer\--name 29. What is the purpose of the "HEALTHCHECK" instruction? AnswerTo check if the application inside is functional 30. What command shows the history of an image? 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