CJE Cheat Sheet 2026

The 30 highest-yield CJE facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which protocol is used by Jenkins for secure remote communication? → SSH
2. What is the 'Remote root directory' setting when configuring a Jenkins agent? → The directory on the agent machine where Jenkins stores workspaces, caches, and build data
3. How do you enforce strong authentication in Jenkins? → Integrate with LDAP or SSO.
4. Which plugin is essential for Jenkins Pipeline functionality? → Pipeline plugin
5. Which risk response strategy involves reducing the likelihood or impact of a risk? → Risk mitigation
6. What common challenge do professionals face when applying Operating Systems & Platforms principles? → Balancing theoretical best practices with practical constraints and real-world conditions
7. In the Jenkins inbound agent architecture, which side initiates the TCP connection? → The agent initiates the TCP connection to the Jenkins controller
8. Which plugin enables Jenkins to dynamically provision and terminate Amazon EC2 instances as build agents? → Amazon EC2 Plugin
9. Which Jenkins feature controls who can access specific resources? → Role-Based Access Control
10. What is the default username for Jenkins after initial installation? → No default username; use initial admin password.
11. What is the recommended approach to staying current in Cloud Computing & Virtualization? → Regular professional development, industry publications, and peer collaboration
12. What is the most important competency assessed in Vulnerability Assessment & Penetration Testing for professionals in this field? → Applied knowledge and practical problem-solving ability
13. Why is regular risk reassessment important? → Because the risk landscape changes as conditions, activities, and environments evolve
14. How do you install a plugin in Jenkins? → Using Jenkins Plugin Manager.
15. What is the recommended approach to staying current in Operating Systems & Platforms? → Regular professional development, industry publications, and peer collaboration
16. Which file stores Jenkins plugin data and configurations? → Both A and B depending on OS.
17. How do you configure Jenkins to run on a different port? → Use the --httpPort flag when starting Jenkins.
18. What is CSRF protection in Jenkins? → Prevents unauthorized command execution.
19. What is the recommended approach to staying current in Disaster Recovery & Backup? → Regular professional development, industry publications, and peer collaboration
20. What common challenge do professionals face when applying Vulnerability Assessment & Penetration Testing principles? → Balancing theoretical best practices with practical constraints and real-world conditions
21. What does the 'Availability' setting for a Jenkins agent control? → When the agent should be online — always, on a schedule, or on demand
22. How can you pause a Jenkins Pipeline execution for user input? → Using 'input' step.
23. What is the purpose of the 'Matrix-based security' in Jenkins? → To assign permissions to users/groups.
24. What common challenge do professionals face when applying Cloud Computing & Virtualization principles? → Balancing theoretical best practices with practical constraints and real-world conditions
25. What is the default TCP port used by Jenkins agents when connecting to the controller via the inbound agent (JNLP) protocol? → 50000
26. What is a 'stage' in a Jenkins Pipeline? → A phase in the pipeline with specific tasks.
27. What is the recommended approach to staying current in Monitoring & Performance Optimization? → Regular professional development, industry publications, and peer collaboration
28. Which plugin is essential for source code management in Jenkins? → Git plugin
29. What is the most important competency assessed in System Administration & Configuration for professionals in this field? → Applied knowledge and practical problem-solving ability
30. What is the most important competency assessed in Emerging Technologies & Trends for professionals in this field? → Applied knowledge and practical problem-solving ability