Jenkins Jenkins Build Triggers and Scheduling

Question 1

Which Jenkins trigger automatically starts a build when a source code change is detected in the SCM repository?

Accepted Answer

Poll SCM

Answer

Build periodically

Answer

GitHub hook trigger for GITScm polling

Answer

Trigger builds remotely

Question 2

What cron syntax would you use in Jenkins to run a build every day at midnight?

Accepted Answer

0 0 * * *

Answer

* * * * 0

Answer

0 * * * *

Answer

* 0 * * *

Question 3

Which Jenkins trigger is used to start a build via an HTTP request to a specific URL using a token?

Accepted Answer

Trigger builds remotely

Answer

Poll SCM

Answer

GitHub webhook

Answer

Upstream project trigger

Question 4

In Jenkins, what does the 'Build after other projects are built' trigger do?

Accepted Answer

Starts a build when specified upstream projects complete

Answer

Polls upstream projects for changes

Answer

Rebuilds failed upstream jobs

Answer

Chains jobs in a pipeline

Question 5

What is the purpose of the 'H' symbol in Jenkins cron scheduling expressions?

Accepted Answer

Hashed scheduling to spread load across time

Answer

Hourly scheduling

Answer

Half-period scheduling

Answer

High-priority scheduling

Question 6

Which of the following correctly configures Jenkins to build a project every 15 minutes?

Accepted Answer

H/15 * * * *

Answer

*/15 * * * *

Answer

15 * * * *

Answer

0,15,30,45 * * * *

Question 7

When using webhook-based triggers in Jenkins, what advantage do they have over Poll SCM?

Accepted Answer

They notify Jenkins immediately when a change occurs, reducing latency

Answer

They require less network bandwidth

Answer

They are more secure

Answer

They work without network access to the SCM server