COA Study Guide 2026
Everything you need to pass the COA 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.
📋 COA Exam Format at a Glance
📚 COA Topics to Study (21)
✍️ Sample COA Questions & Answers
1. Which OpenStack project provides DNS as a service with support for highly available DNS backends?
Designate is OpenStack's DNS-as-a-Service project that integrates with DNS backends like BIND and PowerDNS to provide zone and record management.
2. What is the 'OS::Heat::WaitCondition' resource used for in Heat templates?
OS::Heat::WaitCondition allows Heat to pause and wait for a signal (via a callback URL) from an instance, typically used to confirm that application bootstrapping has completed.
3. Why should automation scripts include version control?
Version control tracks all changes, enables quick rollbacks if issues arise, and supports collaborative development with full change history.
4. What is a 'nested stack' in Heat orchestration?
Nested stacks allow a template to reference another template as a resource type, enabling modular, reusable infrastructure components.
5. What is the difference between monitoring and observability?
Monitoring tracks predefined metrics, while observability provides the tooling and data to investigate unexpected or unknown issues through logs, traces, and metrics.
6. Which component provides a web-based user interface for OpenStack?
Horizon is the official web-based dashboard for OpenStack, providing a graphical user interface (GUI) for users and administrators. It allows for easy management of OpenStack resources such as instances, images, networks, and volumes through a web browser, simplifying cloud operations.