EX294 Transform data with filters and plugins Practice Question
This EX294 practice question tests your understanding of transform data with filters and plugins. 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 playbook uses the 'debug' module to print a variable 'myvar' which is a list of dictionaries. The output shows 'VARIABLE IS UNDEFINED' despite the variable being defined earlier. Which filter issue is most likely?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The variable is defined in a role but the playbook uses include_role incorrectly.
Option D is correct because when a variable is defined inside a role but the playbook uses `include_role` incorrectly (e.g., without `tasks_from` or with a static import instead of dynamic include), the variable may not be available in the play's variable scope. The `debug` module then reports 'VARIABLE IS UNDEFINED' because the variable was never loaded into the play's namespace. This is a common scoping issue with role variables and dynamic includes.
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.
✗
The debug task uses 'var: myvar' instead of 'msg: "{{ myvar }}"'.
Why it's wrong here
Both are valid; 'var' prints the variable directly without extra quotes.
✗
The playbook uses 'set_fact' with quotes around the variable name.
Why it's wrong here
Quotes around variable name are fine.
✗
The variable contains a fact that is only available on the control node.
Why it's wrong here
Facts are gathered on target hosts, but can be used anywhere.
✓
The variable is defined in a role but the playbook uses include_role incorrectly.
Why this is correct
If the variable is defined inside a role but not exposed to the play, it will be undefined.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume any variable defined earlier in the playbook is globally accessible, but Ansible's variable scoping with `include_role` is dynamic and does not automatically propagate role-internal variables to the parent play.
Detailed technical explanation
How to think about this question
Under the hood, Ansible's variable precedence and scope rules mean that variables defined inside a role via `include_role` are not automatically merged into the play's global variable space unless the role is imported statically with `import_role` or the variables are explicitly passed. The `include_role` directive creates a new task context, and variables set within that role (e.g., via `set_fact` or `vars`) are scoped to that role's execution and may not persist after the role completes. This is a common pitfall when using dynamic includes for role reuse.
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 EX294 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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Transform data with filters and plugins — This question tests Transform data with filters and plugins — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The variable is defined in a role but the playbook uses include_role incorrectly. — Option D is correct because when a variable is defined inside a role but the playbook uses `include_role` incorrectly (e.g., without `tasks_from` or with a static import instead of dynamic include), the variable may not be available in the play's variable scope. The `debug` module then reports 'VARIABLE IS UNDEFINED' because the variable was never loaded into the play's namespace. This is a common scoping issue with role variables and dynamic includes.
What should I do if I get this EX294 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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