EX294 Coordinate rolling updates Practice Question
This EX294 practice question tests your understanding of coordinate rolling updates. 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.
Exhibit
Refer to the exhibit.
```yaml
- name: Rolling update web servers
hosts: webservers
serial: 2
max_fail_percentage: 25
tasks:
- name: disable in haproxy
community.general.haproxy:
state: disabled
host: "{{ inventory_hostname }}"
delegate_to: lb01
- name: update web server
ansible.builtin.yum:
name: httpd
state: latest
- name: enable in haproxy
community.general.haproxy:
state: enabled
host: "{{ inventory_hostname }}"
delegate_to: lb01
```
An administrator runs this playbook against a group of 10 web servers. The update fails on the third host (host3) due to a yum error. What is the most likely outcome?
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 playbook continues with the remaining hosts because the number of failures (1) is below the 25% threshold.
Option D is correct because `max_fail_percentage: 25` allows up to 25% of hosts to fail before aborting. With 10 hosts, 2 failures are allowed (25% of 10 = 2.5, so 2 failures). After host3 fails, only 1 failure has occurred (host3), which is below the threshold, so the playbook continues with the remaining batches. Option A is wrong because only host3's disable/enable tasks would be affected; the playbook does not disable all hosts. Option B is wrong because `max_fail_percentage` prevents immediate halt unless the failure threshold is exceeded. Option C is wrong because the first batch (hosts 1-2) completes successfully, but the playbook continues to the next batch (hosts 3-4), and even though host3 fails, host4 may still be updated (unless it also fails).
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.
✗
Only the first batch (host1 and host2) are updated successfully; the remaining hosts are skipped.
Why it's wrong here
The playbook continues to the next batch because the failure count is within the allowed percentage; hosts 4-10 are still processed.
✗
All hosts are disabled in HAProxy and the playbook fails.
Why it's wrong here
The playbook only disables hosts as part of the update process; a failure on one host does not disable all hosts.
✓
The playbook continues with the remaining hosts because the number of failures (1) is below the 25% threshold.
Why this is correct
With `max_fail_percentage: 25`, up to 2 failures are allowed out of 10 hosts. One failure does not stop the playbook.
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 playbook halts immediately after the failure on host3.
Why it's wrong here
The `max_fail_percentage` setting allows up to 2 failures before aborting; a single failure does not halt the playbook.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 EX294 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Coordinate rolling updates — This question tests Coordinate rolling updates — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The playbook continues with the remaining hosts because the number of failures (1) is below the 25% threshold. — Option D is correct because `max_fail_percentage: 25` allows up to 25% of hosts to fail before aborting. With 10 hosts, 2 failures are allowed (25% of 10 = 2.5, so 2 failures). After host3 fails, only 1 failure has occurred (host3), which is below the threshold, so the playbook continues with the remaining batches. Option A is wrong because only host3's disable/enable tasks would be affected; the playbook does not disable all hosts. Option B is wrong because `max_fail_percentage` prevents immediate halt unless the failure threshold is exceeded. Option C is wrong because the first batch (hosts 1-2) completes successfully, but the playbook continues to the next batch (hosts 3-4), and even though host3 fails, host4 may still be updated (unless it also fails).
What should I do if I get this EX294 question wrong?
Identify which EX294 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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