EX294 Implement advanced Ansible automation Practice Question
This EX294 practice question tests your understanding of implement advanced ansible automation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
You have an Ansible playbook that uses the 'lineinfile' module to manage the /etc/ssh/sshd_config file. The playbook runs without errors, but after execution, the SSH service becomes unreachable on some hosts. Investigation reveals that the file contains duplicate lines for 'Port 22' and 'PermitRootLogin no'. The playbook uses the following task:
The playbook is run multiple times. What is the most likely cause of the duplicate lines?
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 regexp pattern does not match the existing lines exactly, causing new lines to be added instead of replacing.
Option A is correct because the regexp pattern `^{{ item.key }}` matches only the start of a line (e.g., `^Port` or `^PermitRootLogin`), but the existing lines in `/etc/ssh/sshd_config` may have leading spaces or tabs (common in SSH config files). Since the regex does not match the actual line due to whitespace, the `lineinfile` module inserts a new line instead of replacing the existing one. Each playbook run adds another duplicate, eventually causing SSH to fail due to conflicting directives.
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 regexp pattern does not match the existing lines exactly, causing new lines to be added instead of replacing.
Why this is correct
If the line has leading spaces or is not at the start, it may not match.
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.
✗
The 'lineinfile' module is not idempotent when used with loops.
Why it's wrong here
The module is idempotent if the regexp matches correctly.
✗
The loop should use 'with_items' instead of 'loop' for proper idempotence.
Why it's wrong here
Both 'loop' and 'with_items' work similarly.
✗
The 'line' parameter should use backreferences to avoid duplication.
Why it's wrong here
Backreferences are not needed for simple key-value pairs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume `regexp` with `^` will match any line starting with the key, but they overlook that SSH config files often have leading whitespace, causing the module to add duplicate lines instead of replacing.
Trap categories for this question
Similar concept trap
Both 'loop' and 'with_items' work similarly.
Detailed technical explanation
How to think about this question
The `lineinfile` module uses the `regexp` parameter to locate an existing line; if no match is found, it appends the `line` parameter as a new line. SSH config files often have indentation (e.g., ` Port 22`), so `^Port` fails to match. A robust fix would use `regexp: '^\s*{{ item.key }}'` to ignore leading whitespace. In real-world scenarios, this issue also appears with other config files like `/etc/chrony.conf` or `/etc/security/limits.conf` where indentation is common.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Implement advanced Ansible automation — This question tests Implement advanced Ansible automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The regexp pattern does not match the existing lines exactly, causing new lines to be added instead of replacing. — Option A is correct because the regexp pattern `^{{ item.key }}` matches only the start of a line (e.g., `^Port` or `^PermitRootLogin`), but the existing lines in `/etc/ssh/sshd_config` may have leading spaces or tabs (common in SSH config files). Since the regex does not match the actual line due to whitespace, the `lineinfile` module inserts a new line instead of replacing the existing one. Each playbook run adds another duplicate, eventually causing SSH to fail due to conflicting directives.
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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