Quiz

Test your understanding of the concepts covered in the Multi-Container Environments chapter.

Q1. Why is creating a user-defined bridge network (`docker network create`) preferred over relying on the default bridge network when connecting multiple containers?

A User-defined networks provide automatic service discovery (DNS resolution by container/service name) and network isolation between stacks B The default bridge network does not support TCP connections C User-defined networks run without using host CPU resources D The default bridge network limits containers to 1 MB of memory

Explanation

Containers on user-defined bridge networks can automatically resolve each other's container or service names to IP addresses via Docker DNS, providing secure network isolation.

Q2. Which Docker Compose file attribute ensures that dependent containers (such as a database service `es`) start before an application service `web`?

A depends_on B require_first C links_to D after_service

Explanation

The `depends_on` directive in `docker-compose.yml` specifies dependency ordering, instructing Compose to create and start prerequisite services first.

Q3. Which command starts all services defined in a `docker-compose.yml` file in background (detached) mode?

A docker compose start B docker compose up -d C docker compose run --bg D docker compose launch

Explanation

Running `docker compose up -d` creates the network, volumes, and containers defined in your stack and runs them in detached mode.

Q4. What command stops containers and networks created by Docker Compose AND removes named persistent volumes?

A docker compose stop B docker compose down -v C docker compose delete --all D docker compose prune

Explanation

`docker compose down` stops containers and networks, while adding `-v` also removes named volumes declared under the `volumes:` block.

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