- A
Task execution order should not affect the final state.
Idempotent plays produce same result regardless of order.
- B
Modules should be state-based and check current state before action.
Idempotency relies on state checking.
- C
Variables registered from previous tasks should be avoided.
Why wrong: Registered variables are fine for idempotency.
- D
Loops must be avoided because they always cause changes.
Why wrong: Loops can be idempotent.
- E
The 'ignore_errors' directive should be used sparingly and only when appropriate.
Overuse can mask idempotency issues.
Question 420 of 528
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.
Which THREE factors are essential for achieving idempotent behavior in Ansible plays?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Task execution order should not affect the final state.
Options A, B, and E are correct for achieving idempotent behavior in Ansible plays. A is correct because idempotent tasks should produce the same final state regardless of the order they are executed; this ensures consistency across multiple runs. B is correct because idempotent modules check the current state before making any changes, only acting when the desired state differs, which is fundamental to idempotency. E is correct because 'ignore_errors' should be used sparingly; overusing it can mask failures that would otherwise leave the system in a non-idempotent state, as subsequent runs may not correct hidden issues. C is incorrect because registered variables can be used in an idempotent manner; they do not inherently break idempotency. D is incorrect because loops can be idempotent if the module inside the loop is idempotent and the loop is designed to handle conditional changes.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Task execution order should not affect the final state.
Why this is correct
Idempotent plays produce same result regardless of order.
Related concept
CIDR notation defines the prefix length.
- ✓
Modules should be state-based and check current state before action.
Why this is correct
Idempotency relies on state checking.
Related concept
CIDR notation defines the prefix length.
- ✗
Variables registered from previous tasks should be avoided.
Why it's wrong here
Registered variables are fine for idempotency.
- ✗
Loops must be avoided because they always cause changes.
Why it's wrong here
Loops can be idempotent.
- ✓
The 'ignore_errors' directive should be used sparingly and only when appropriate.
Why this is correct
Overuse can mask idempotency issues.
Related concept
CIDR notation defines the prefix length.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related EX294 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this EX294 question test?
Implement advanced Ansible automation — This question tests Implement advanced Ansible automation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Task execution order should not affect the final state. — Options A, B, and E are correct for achieving idempotent behavior in Ansible plays. A is correct because idempotent tasks should produce the same final state regardless of the order they are executed; this ensures consistency across multiple runs. B is correct because idempotent modules check the current state before making any changes, only acting when the desired state differs, which is fundamental to idempotency. E is correct because 'ignore_errors' should be used sparingly; overusing it can mask failures that would otherwise leave the system in a non-idempotent state, as subsequent runs may not correct hidden issues. C is incorrect because registered variables can be used in an idempotent manner; they do not inherently break idempotency. D is incorrect because loops can be idempotent if the module inside the loop is idempotent and the loop is designed to handle conditional changes.
What should I do if I get this EX294 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related EX294 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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Last reviewed: Jun 24, 2026
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