Courseiva
← EX294
Full test
Question 170 of 518
Transform data with filters and plugins →mediumMultiple ChoiceObjective-mapped

EX294 Transform data with filters and plugins Practice Question

This EX294 practice question tests your understanding of transform data with filters and plugins. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.

A senior automation engineer is optimizing a playbook that processes large amounts of data. The playbook uses the "json_query" filter to filter and extract specific fields from a complex JSON structure returned by an API. The engineer notices that the playbook runs very slowly and consumes a lot of memory. They suspect the json_query filter is inefficient for this use case. The engineer wants to replace json_query with a combination of built-in Ansible filters to improve performance. The JSON structure is as follows:

{
  "servers": [
    {"name": "web01", "status": "active", "role": "web"},
    {"name": "web02", "status": "active", "role": "web"},
    {"name": "db01", "status": "active", "role": "db"}
  ]
}

The engineer needs to extract a list of server names where the status is "active" and the role is "web". The current code using json_query is: server_names: "{{ api_result | json_query(\"servers[?status=='active' && role=='web'].name\") }}" Which of the following alternatives uses only Ansible built-in filters (not json_query) and is likely to be more efficient?

Question 1mediummultiple choice
Read the full Ansible explanation →

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

✓

server_names: "{{ api_result.servers | selectattr('status', '==', 'active') | selectattr('role', '==', 'web') | map(attribute='name') | list }}"

Option A is correct. It uses selectattr twice to filter by status and role, then map to extract names. This is more efficient because it avoids JMESPath parsing and works directly on Python objects. Option B uses 'equalto' which is not a valid test operator for selectattr. Option C uses 'is' which is invalid. Option D uses rejectattr with '==' which would exclude the correct items, giving the opposite result.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    server_names: "{{ api_result.servers | rejectattr('status', '==', 'active') | rejectattr('role', '==', 'web') | map(attribute='name') | list }}"

    Why it's wrong here

    rejectattr with '==' removes items that match; this would give servers that are not active or not web, opposite of desired.

  • ✗

    server_names: "{{ api_result.servers | selectattr('status', 'equalto', 'active') | selectattr('role', 'equalto', 'web') | map(attribute='name') | list }}"

    Why it's wrong here

    Filters like selectattr do not support 'equalto'; they use operators like '==', '!=', 'in', etc.

  • ✗

    server_names: "{{ api_result.servers | selectattr('status', 'is', 'active') | selectattr('role', 'is', 'web') | map(attribute='name') | list }}"

    Why it's wrong here

    'is' is not a valid operator for selectattr.

  • ✓

    server_names: "{{ api_result.servers | selectattr('status', '==', 'active') | selectattr('role', '==', 'web') | map(attribute='name') | list }}"

    Why this is correct

    Correctly filters active and web roles, then extracts names.

    Related concept

    Static NAT maps one inside address to one outside address.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

  • Static NAT maps one inside address to one outside address.
  • PAT allows many inside hosts to share one public address using ports.
  • Inside local and inside global describe the private and translated addresses.
  • NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

  • Identify inside and outside interfaces first.
  • Check whether the scenario needs static NAT, dynamic NAT or PAT.
  • Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related EX294 NAT questions on configuration and troubleshooting.

Related practice questions

Related EX294 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Deploy Ansible Automation Platform practice questions

Practise EX294 questions linked to Deploy Ansible Automation Platform.

Manage inventories and credentials practice questions

Practise EX294 questions linked to Manage inventories and credentials.

Manage task execution and roles practice questions

Practise EX294 questions linked to Manage task execution and roles.

Coordinate rolling updates practice questions

Practise EX294 questions linked to Coordinate rolling updates.

Transform data with filters and plugins practice questions

Practise EX294 questions linked to Transform data with filters and plugins.

Create content collections and execution environments practice questions

Practise EX294 questions linked to Create content collections and execution environments.

Implement advanced Ansible automation practice questions

Practise EX294 questions linked to Implement advanced Ansible automation.

Manage automation security and operations practice questions

Practise EX294 questions linked to Manage automation security and operations.

EX294 fundamentals practice questions

Practise EX294 questions linked to EX294 fundamentals.

EX294 scenario practice questions

Practise EX294 questions linked to EX294 scenario.

EX294 troubleshooting practice questions

Practise EX294 questions linked to EX294 troubleshooting.

Practice this exam

Start a free EX294 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions20 questions30 questions50 questionsTimed 30
EX294 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this EX294 question test?

Transform data with filters and plugins — This question tests Transform data with filters and plugins — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: server_names: "{{ api_result.servers | selectattr('status', '==', 'active') | selectattr('role', '==', 'web') | map(attribute='name') | list }}" — Option A is correct. It uses selectattr twice to filter by status and role, then map to extract names. This is more efficient because it avoids JMESPath parsing and works directly on Python objects. Option B uses 'equalto' which is not a valid test operator for selectattr. Option C uses 'is' which is invalid. Option D uses rejectattr with '==' which would exclude the correct items, giving the opposite result.

What should I do if I get this EX294 question wrong?

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related EX294 NAT questions on configuration and troubleshooting.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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 →

How Courseiva writes practice questions · Editorial policy

Keep practising

More EX294 practice questions

Browse all EX294 questions →

Last reviewed: Jun 24, 2026

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.

Loading comments…

Sign in to join the discussion.

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.