EX294 Manage inventories and credentials Practice Question
This EX294 practice question tests your understanding of manage inventories and credentials. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 Tower administrator notices that a job template using a dynamic inventory source from AWS EC2 is not updating when new instances are launched. The inventory source is set to update on launch. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The AWS credential associated with the inventory source is invalid or expired.
Option B is correct because the most likely cause of a dynamic inventory source not updating is that the associated AWS credential is invalid or expired. When the 'update on launch' option is enabled, Ansible Tower attempts to refresh the inventory from the source before each job run. If the credential (e.g., AWS access key ID and secret access key) is no longer valid, the inventory update will fail silently or with an error, and the job will use stale cached data.
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.
✗
The inventory source cache timeout is set too high.
Why it's wrong here
Cache timeout affects how long old data is used, but update on launch forces a refresh.
✓
The AWS credential associated with the inventory source is invalid or expired.
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The 'update on launch' option is disabled.
Why it's wrong here
The question states it is enabled.
✗
The inventory source is configured as a custom script.
Why it's wrong here
It is an EC2 source.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the 'update on launch' option is misconfigured or that cache settings are the problem, when in reality the credential validity is the root cause that prevents any update from succeeding.
Detailed technical explanation
How to think about this question
Ansible Tower uses the boto3 library to authenticate with AWS EC2 via the provided access key and secret key. If the credential is invalid (e.g., revoked, expired, or incorrect), the API call to describe EC2 instances returns an authentication error (HTTP 401). Tower logs this error but may not surface it clearly in the job output, leading to the appearance of a non-updating inventory. The 'update on launch' option triggers an inventory sync before the job runs, but a failed sync due to bad credentials will cause the job to use the last successful cached inventory data.
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 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
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.
Manage inventories and credentials — This question tests Manage inventories and credentials — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The AWS credential associated with the inventory source is invalid or expired. — Option B is correct because the most likely cause of a dynamic inventory source not updating is that the associated AWS credential is invalid or expired. When the 'update on launch' option is enabled, Ansible Tower attempts to refresh the inventory from the source before each job run. If the credential (e.g., AWS access key ID and secret access key) is no longer valid, the inventory update will fail silently or with an error, and the job will use stale cached data.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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