Quick Answer
The answer is incorrect indentation in the YAML file, as this is the most common cause of an Ansible YAML syntax error. YAML relies entirely on consistent spacing—typically two spaces per level—to define the hierarchical structure of plays, tasks, and variables, so even a single misplaced tab or extra space will cause the parser to fail with the error 'Syntax Error while loading YAML script'. On the CompTIA Linux+ XK0-005 exam, this question tests your understanding of Ansible playbook structure and YAML’s strict formatting rules, often appearing as a distractor where candidates might confuse syntax errors with authentication or connection issues. A common trap is assuming a missing SSH key would produce this error, but that results in a different failure type. Remember the mnemonic: “YAML Ain’t Markup Language—it’s all about the space,” so always check your indentation first when debugging playbook failures.
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 team uses Ansible for configuration management. A playbook fails with the error 'ERROR! Syntax Error while loading YAML script'. Which of the following is the most likely cause?
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.
Missing SSH key
Why wrong: Would cause a connection error, not a YAML syntax error.
Incorrect indentation in the YAML file
YAML syntax errors are most commonly due to indentation mistakes.
Invalid module name
Why wrong: Invalid module name would produce a 'module not found' error, not a syntax error.
Playbook not executable
Why wrong: Ansible playbooks do not need to be executable; they are parsed by ansible-playbook.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Incorrect indentation in the YAML file
The error 'Syntax Error while loading YAML script' indicates that Ansible's YAML parser encountered a structural problem in the playbook file. The most common cause in YAML is incorrect indentation, because YAML relies on consistent spacing (typically 2 spaces per level) to define the hierarchy of tasks, plays, and variables. A missing SSH key would produce a connection or authentication error, not a YAML syntax error.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Missing SSH key
Why it's wrong here
Would cause a connection error, not a YAML syntax error.
Incorrect indentation in the YAML file
Why this is correct
YAML syntax errors are most commonly due to indentation mistakes.
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.
Invalid module name
Why it's wrong here
Invalid module name would produce a 'module not found' error, not a syntax error.
Playbook not executable
Why it's wrong here
Ansible playbooks do not need to be executable; they are parsed by ansible-playbook.
Common exam traps
The trap here is that candidates may confuse a YAML parsing error with a runtime execution error, such as an SSH key issue or an invalid module, because they all prevent the playbook from running successfully.
Detailed technical explanation
YAML uses indentation (spaces only, not tabs) to denote nested structures like plays, tasks, and variables. A single extra space or a tab character can break the parser, causing the 'Syntax Error while loading YAML script' message. In real-world scenarios, this often happens when copying code from a web browser that converts spaces to tabs or when mixing editors with different tab settings.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Scripting, Containers and Automation — study guide chapter
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FAQ
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
The correct answer is: Incorrect indentation in the YAML file — The error 'Syntax Error while loading YAML script' indicates that Ansible's YAML parser encountered a structural problem in the playbook file. The most common cause in YAML is incorrect indentation, because YAML relies on consistent spacing (typically 2 spaces per level) to define the hierarchy of tasks, plays, and variables. A missing SSH key would produce a connection or authentication error, not a YAML syntax error.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This XK0-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-005 exam.
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