EX294 Transform data with filters and plugins Practice Question
This EX294 practice question tests your understanding of transform data with filters and plugins. 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 Ansible playbook needs to generate a list of IP addresses from a range 192.168.1.10 to 192.168.1.20. Which filter should be used in a Jinja2 template?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
{{ '192.168.1.10-20' | ipaddr('range_include') }}
Option B is correct because the `ipaddr` filter with the `'range_include'` parameter generates a list of all IP addresses within a specified range, including both endpoints. In this case, `'192.168.1.10-20' | ipaddr('range_include')` produces a list from 192.168.1.10 through 192.168.1.20, which is exactly what the playbook needs to generate.
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.
✗
{{ '192.168.1.10/28' | ipsubnet }}
Why it's wrong here
ipsubnet calculates subnet details, not a range of IPs.
✓
{{ '192.168.1.10-20' | ipaddr('range_include') }}
Why this is correct
ipaddr with 'range_include' generates a list of IPs in the inclusive range.
Related concept
Read the scenario before looking for a memorised answer.
✗
{{ '192.168.1.10' | ipmath('+10') }}
Why it's wrong here
ipmath performs arithmetic on a single IP, not generating a list.
✗
{{ '192.168.1.10' | ipwrap }}
Why it's wrong here
ipwrap wraps IP in brackets, not for generating ranges.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `ipaddr('range_include')` with `ipsubnet` or `ipmath`, mistakenly thinking a CIDR or arithmetic operation can produce a list of IPs, when only the `range_include` parameter of `ipaddr` is designed for that purpose.
Detailed technical explanation
How to think about this question
The `ipaddr` filter in Ansible is part of the `community.general` collection and leverages Python's `netaddr` library to perform advanced IP address manipulations. The `'range_include'` parameter specifically generates all addresses between two given IPs inclusive, which is useful for tasks like iterating over a static IP pool in a playbook. A subtle behavior is that the range must be specified in the format `start-end` (e.g., `192.168.1.10-20`), and the filter automatically handles the conversion to a list of strings.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Transform data with filters and plugins — This question tests Transform data with filters and plugins — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: {{ '192.168.1.10-20' | ipaddr('range_include') }} — Option B is correct because the `ipaddr` filter with the `'range_include'` parameter generates a list of all IP addresses within a specified range, including both endpoints. In this case, `'192.168.1.10-20' | ipaddr('range_include')` produces a list from 192.168.1.10 through 192.168.1.20, which is exactly what the playbook needs to generate.
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.
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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