EX294 Manage inventories and credentials Practice Question
This EX294 practice question tests your understanding of manage inventories and credentials. 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.
Exhibit
Refer to the exhibit.
```yaml
inventory_source:
name: Production Inventory
organization: Default
source: scm
source_project: "Ansible Inventory Repo"
source_path: "inventories/production/hosts.yml"
credential: "GitHub Personal Access Token"
update_on_launch: true
update_cache_timeout: 0
```
The administrator has noticed that the inventory sync fails with authentication errors. The GitHub Personal Access Token credential is of type 'Machine' instead of 'Source Control'.
What is the most likely cause of the failure?
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.
Refer to the exhibit.
```yaml
inventory_source:
name: Production Inventory
organization: Default
source: scm
source_project: "Ansible Inventory Repo"
source_path: "inventories/production/hosts.yml"
credential: "GitHub Personal Access Token"
update_on_launch: true
update_cache_timeout: 0
```
The administrator has noticed that the inventory sync fails with authentication errors. The GitHub Personal Access Token credential is of type 'Machine' instead of 'Source Control'.
A
The inventory must be of type 'file' rather than 'scm'.
Why wrong: The 'scm' source type pulls inventory from a source control project, which is correct for this setup.
B
The source_path is incorrect because it should be a directory, not a file.
Why wrong: The source_path can point to a specific file; this is not typically an authentication error.
C
The source_project should reference the project ID, not name.
Why wrong: Tower accepts both project names and IDs in this field; using a name is not an error.
D
The update_cache_timeout should be a positive integer.
Why wrong: A value of 0 disables caching and is valid; it does not cause authentication errors.
E
The credential type is incorrect; it should be a Source Control credential, not Machine.
A Machine credential is designed for SSH/WinRM, not for authenticating to a source control system. Using the appropriate credential type is essential.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The credential type is incorrect; it should be a Source Control credential, not Machine.
Option B is correct because the credential type must match the service; a Machine credential is used for SSH/WinRM, not for source control. Using a Source Control credential ensures proper authentication for the SCM project. Option A is incorrect because source_path can be a file or directory; the error is authentication-related. Option C is incorrect because update_cache_timeout=0 is valid (no caching). Option D is incorrect because source_project can accept either name or ID. Option E is incorrect because source 'scm' is valid for sourcing inventory from a project.
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.
✗
The inventory must be of type 'file' rather than 'scm'.
Why it's wrong here
The 'scm' source type pulls inventory from a source control project, which is correct for this setup.
✗
The source_path is incorrect because it should be a directory, not a file.
Why it's wrong here
The source_path can point to a specific file; this is not typically an authentication error.
✗
The source_project should reference the project ID, not name.
Why it's wrong here
Tower accepts both project names and IDs in this field; using a name is not an error.
✗
The update_cache_timeout should be a positive integer.
Why it's wrong here
A value of 0 disables caching and is valid; it does not cause authentication errors.
✓
The credential type is incorrect; it should be a Source Control credential, not Machine.
Why this is correct
A Machine credential is designed for SSH/WinRM, not for authenticating to a source control system. Using the appropriate credential type is essential.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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.
Manage inventories and credentials — This question tests Manage inventories and credentials — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The credential type is incorrect; it should be a Source Control credential, not Machine. — Option B is correct because the credential type must match the service; a Machine credential is used for SSH/WinRM, not for source control. Using a Source Control credential ensures proper authentication for the SCM project. Option A is incorrect because source_path can be a file or directory; the error is authentication-related. Option C is incorrect because update_cache_timeout=0 is valid (no caching). Option D is incorrect because source_project can accept either name or ID. Option E is incorrect because source 'scm' is valid for sourcing inventory from a project.
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.
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?
Static NAT maps one inside address to one outside address.
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