Learn Docker fundamentals: images, containers, volumes, networking, Compose, registries, and security — with a free practice quiz and clear explanations.
Docker is the most widely used container platform, and container skills are foundational for modern software delivery, DevOps, and Kubernetes. This guide and quiz cover the fundamentals every engineer should know.
Note: the official Docker Certified Associate (DCA) exam was retired, but Docker skills remain essential. This quiz focuses on practical, evergreen Docker knowledge rather than a specific exam.
▶ Start the free Docker practice quiz| Certification | Docker Fundamentals |
|---|---|
| Exam code | Docker |
| Level | Foundational |
| Format | Practice quiz (no active official exam) |
| Questions | Self-paced practice |
| Duration | Untimed |
| Passing score | N/A |
| Cost (USD) | Free |
| Validity | N/A |
| Prerequisites | Basic command-line familiarity |
Exam details change over time — always confirm the current specifics on the official exam page before you book.
The official exam is organized into these domains. Our practice bank mirrors them so you can drill each area:
| Domain | Exam weight | Practice questions |
|---|---|---|
| Images & Dockerfiles | ~25% | 4 |
| Containers & Lifecycle | ~20% | 4 |
| Storage & Networking | ~25% | 4 |
| Compose & Registries | ~20% | 4 |
| Security | ~10% | 3 |
Learn images and Dockerfiles (layers, multi-stage builds, caching), the container lifecycle, and the run/exec/logs commands.
Understand volumes, networking (bridge/host, DNS), Docker Compose for multi-container apps, registries, and container security best practices.
The free quiz below covers all of these areas with explanations.
Our free Docker practice quiz has 19 scenario-based questions covering every exam domain. Each question includes the correct answer, a plain-English explanation of why it is right (and why the alternatives are wrong), and a reference to the relevant topic — so you learn as you go, not just test yourself.
▶ Practice Docker now — 19 questions, freeThe Docker Certified Associate (DCA) was retired. Docker skills are still widely required; this quiz focuses on practical fundamentals.
Understanding containers (images, registries, runtime) is essential background before learning Kubernetes.
Yes — it's a free, self-paced practice quiz with explanations.
Kubernetes (start with KCNA, then CKA) is the natural next step.