EX294 Coordinate rolling updates Practice Question
This EX294 practice question tests your understanding of coordinate rolling updates. 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.
Which TWO options are best practices for coordinating rolling updates with Ansible? (Choose exactly two.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the serial keyword to update hosts in batches.
Option B is correct because the `serial` keyword in Ansible controls how many hosts are updated at a time during a rolling update, allowing you to update hosts in batches to maintain service availability. This is a best practice for coordinating rolling updates as it prevents overwhelming the infrastructure and ensures that a subset of hosts remains operational while others are being updated.
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.
✗
Set ignore_errors: yes to ensure the playbook continues even if some hosts fail.
Why it's wrong here
ignore_errors masks failures, leading to potential inconsistency.
✓
Use the serial keyword to update hosts in batches.
Why this is correct
serial enables batching, which is the core of rolling updates.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the default serial setting (all hosts) for simplicity.
Why it's wrong here
Default serial updates all hosts at once, not rolling.
✓
Set max_fail_percentage to limit the number of failed hosts before aborting.
Why this is correct
max_fail_percentage provides a safety threshold to abort on excessive failures.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Run all hosts in parallel to minimize total update time.
Why it's wrong here
Running all hosts in parallel is the opposite of a rolling update; it risks downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `ignore_errors` with error handling for rolling updates, not realizing that it bypasses failure detection, whereas `max_fail_percentage` is the correct way to control abort behavior during batch updates.
Detailed technical explanation
How to think about this question
The `serial` keyword in Ansible sets the batch size for host execution; for example, `serial: 2` updates two hosts at a time, waiting for the batch to complete before proceeding. The `max_fail_percentage` option (option D) works in conjunction with `serial` to abort the playbook if the percentage of failed hosts in a batch exceeds the threshold, providing a safety mechanism. In real-world scenarios, such as updating a load-balanced web server farm, using `serial: 1` with `max_fail_percentage: 0` ensures zero downtime by updating one host at a time and aborting on any failure.
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.
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: Use the serial keyword to update hosts in batches. — Option B is correct because the `serial` keyword in Ansible controls how many hosts are updated at a time during a rolling update, allowing you to update hosts in batches to maintain service availability. This is a best practice for coordinating rolling updates as it prevents overwhelming the infrastructure and ensures that a subset of hosts remains operational while others are being updated.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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