The answer is to configure Jenkins to poll the Git repository every minute for changes. This is correct because Jenkins’ polling mechanism works by having the Jenkins server initiate outbound connections to check the Git repository at set intervals, which functions perfectly when the server is behind a firewall and cannot receive inbound webhooks from GitHub. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of network constraints in CI/CD automation—specifically that webhooks require the Jenkins server to be internet-accessible, while polling does not. A common trap is assuming webhooks are always superior, but the firewall restriction here makes polling the only viable option for triggering Jenkins jobs automatically. Remember the memory tip: “If you can’t receive, you must retrieve”—polling is the retrieval method that works when inbound connections are blocked.
XK0-005 Scripting, Containers and Automation Practice Question
This XK0-005 practice question tests your understanding of scripting, containers and automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A development team uses Git for version control and wants to automate the testing of every commit pushed to the repository. They have a Jenkins server running on a Linux machine. The team wants to automatically trigger a Jenkins pipeline job whenever a push is made to the main branch of their Git repository. The Jenkins server is behind a firewall and cannot be accessed from the internet. The Git repository is hosted on a private GitHub repository. Which of the following is the best approach to trigger the Jenkins job automatically?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure Jenkins to poll the Git repository every minute for changes.
Option B is correct because Jenkins' polling mechanism allows it to periodically check the Git repository for changes, which works even when the Jenkins server is behind a firewall and cannot receive inbound webhooks. Polling every minute provides near-real-time automation without requiring internet access to the Jenkins server, making it the only viable option given the network constraint.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Have developers manually click 'Build Now' in Jenkins after each push.
Why it's wrong here
Not automated.
✓
Configure Jenkins to poll the Git repository every minute for changes.
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure a GitHub webhook to send a POST request to the Jenkins server.
Why it's wrong here
Jenkins is not reachable from internet.
✗
Set up a cron job on the Git server to execute a script that triggers Jenkins.
Why it's wrong here
Git server is external and not under admin control.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume webhooks are always the best automation trigger, but the firewall restriction makes polling the only practical solution when the Jenkins server cannot receive inbound connections.
Detailed technical explanation
How to think about this question
Jenkins polling uses the SCM (Source Code Management) plugin to periodically execute 'git ls-remote' or similar commands to compare the latest commit hash with the last known build commit. The polling interval is configured in the job's 'Build Triggers' section, and the default unit is minutes. In a private GitHub repository, Jenkins must authenticate via SSH keys or a personal access token to perform the poll, and the firewall must allow outbound HTTPS (port 443) traffic from Jenkins to GitHub.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the XK0-005 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure Jenkins to poll the Git repository every minute for changes. — Option B is correct because Jenkins' polling mechanism allows it to periodically check the Git repository for changes, which works even when the Jenkins server is behind a firewall and cannot receive inbound webhooks. Polling every minute provides near-real-time automation without requiring internet access to the Jenkins server, making it the only viable option given the network constraint.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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