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.
An administrator wants to update a web server fleet with minimal downtime. They need to update each server one at a time. Which Ansible playbook directive should be used?
throttle: 1
Why wrong: Throttle limits task concurrency across hosts, not batch ordering.
forks: 1
Why wrong: forks controls parallelism of tasks, not batches of hosts.
serial: 1
Correct. serial sets the batch size for rolling updates.
max_fail_percentage: 0
Why wrong: max_fail_percentage sets failure threshold, not batch size.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
serial: 1
Option C is correct because the `serial: 1` directive in an Ansible playbook controls the batch size of hosts that are updated simultaneously. Setting it to 1 ensures that only one host is updated at a time, which minimizes downtime by allowing the rest of the fleet to remain available while each server is sequentially updated.
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.
throttle: 1
Why it's wrong here
Throttle limits task concurrency across hosts, not batch ordering.
forks: 1
Why it's wrong here
forks controls parallelism of tasks, not batches of hosts.
serial: 1
Why this is correct
Correct. serial sets the batch size for rolling updates.
Related concept
Read the scenario before looking for a memorised answer.
max_fail_percentage: 0
Why it's wrong here
max_fail_percentage sets failure threshold, not batch size.
Common exam traps
The trap here is that candidates often confuse `serial` with `forks` or `throttle`, mistakenly thinking that limiting parallel task execution (`forks: 1`) or task concurrency (`throttle: 1`) achieves the same one-at-a-time host update behavior, but only `serial` controls the batch size of hosts processed sequentially.
Detailed technical explanation
The `serial` directive works by dividing the inventory into batches of the specified size and running the entire playbook on each batch sequentially. When `serial: 1` is used, Ansible processes one host at a time, waiting for the playbook to complete on that host before moving to the next. This is critical for rolling updates where services must remain available, as it allows load balancers to drain connections or health checks to stabilize before the next host is updated. A subtle behavior is that if a batch fails, the playbook stops, preventing further updates until the issue is resolved.
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 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Coordinate rolling updates — study guide chapter
Learn the concepts, then practise the questions
Coordinate rolling updates practice questions
Targeted practice on this topic area only
All EX294 questions
518 questions across all exam domains
Red Hat Certified Engineer EX294 study guide
Full concept coverage aligned to exam objectives
EX294 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise EX294 questions linked to Deploy Ansible Automation Platform.
Practise EX294 questions linked to Manage inventories and credentials.
Practise EX294 questions linked to Manage task execution and roles.
Practise EX294 questions linked to Coordinate rolling updates.
Practise EX294 questions linked to Transform data with filters and plugins.
Practise EX294 questions linked to Create content collections and execution environments.
Practise EX294 questions linked to Implement advanced Ansible automation.
Practise EX294 questions linked to Manage automation security and operations.
Practise EX294 questions linked to EX294 fundamentals.
Practise EX294 questions linked to EX294 scenario.
Practise EX294 questions linked to EX294 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Coordinate rolling updates — This question tests Coordinate rolling updates — Read the scenario before looking for a memorised answer..
The correct answer is: serial: 1 — Option C is correct because the `serial: 1` directive in an Ansible playbook controls the batch size of hosts that are updated simultaneously. Setting it to 1 ensures that only one host is updated at a time, which minimizes downtime by allowing the rest of the fleet to remain available while each server is sequentially updated.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
Last reviewed: Jun 25, 2026
This EX294 practice question is part of Courseiva's free Red Hat 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 EX294 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.