DCA Study Guide 2026
Everything you need to pass the DCA exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 DCA Exam Format at a Glance
📚 DCA Topics to Study (21)
✍️ Sample DCA Questions & Answers
1. Which command updates the image of a running service named 'api' to use the tag '2.0'?
`docker service update --image api:2.0 api` triggers a rolling update of the service's tasks to use the new image.
2. What is the purpose of financial forecasting in DCA practice?
Financial forecasting uses historical data, current trends, and assumptions to project future revenues, expenses, and financial position, supporting strategic planning and resource allocation decisions.
3. Which command lists all nodes currently participating in a Docker Swarm?
`docker node ls` lists every node in the Swarm along with its role, status, and availability.
4. What is the primary purpose of a code of ethics in DCA practice?
A code of ethics provides a framework of professional values and behavioral standards that guides practitioners in ethical decisions while maintaining public trust.
5. What is multi-factor authentication (MFA) in DCA security?
MFA requires users to provide two or more distinct verification factors (something they know, something they have, something they are) before gaining access, significantly reducing unauthorized access risk.
6. What is the difference between quality assurance and quality control in DCA practice?
Quality assurance is proactive and process-oriented, designed to prevent defects. Quality control is reactive and product-oriented, focused on identifying defects in finished outputs through inspection and testing.