EX294 Practice Question: Create content collections and execution environments
This EX294 practice question tests your understanding of create content collections and execution environments. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Ansible Builder fails during the build of an execution environment with error: 'No matching manifest for linux/amd64 in the manifest list entries'. 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 base image specified is incompatible with the host architecture.
Option D is correct because the error 'No matching manifest for linux/amd64 in the manifest list entries' indicates that the base image specified in the execution environment definition file does not have a container image manifest for the host's CPU architecture (linux/amd64). Ansible Builder pulls the base image from a registry, and if that image only supports other architectures (e.g., linux/arm64), the build fails. This is a common issue when using a base image built for a different platform.
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 ansible-builder version is too old.
Why it's wrong here
An outdated version might cause different errors, but not a manifest mismatch.
✗
The definition file has invalid syntax.
Why it's wrong here
Invalid syntax would cause a YAML parse error, not a manifest mismatch.
✗
The container registry requires authentication.
Why it's wrong here
Authentication issues typically produce 'unauthorized' or 'access denied' errors.
✓
The base image specified is incompatible with the host architecture.
Why this is correct
The error 'No matching manifest for linux/amd64' indicates the base image does not support the build host's architecture.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Red Hat often tests the misconception that registry authentication or syntax errors cause all build failures, but here the specific manifest list error is a clear indicator of an architecture mismatch, not a credential or syntax problem.
Detailed technical explanation
How to think about this question
Container registries use manifest lists (also called multi-architecture images) to serve different platform-specific images under a single tag. When the host requests a manifest for 'linux/amd64' but the registry only has entries for other architectures (e.g., linux/arm64/v8), the error occurs. This can happen when using a base image like 'registry.access.redhat.com/ubi8/ubi:latest' that may not have an amd64 variant, or when the image was built only for ARM. The fix is to specify a base image that supports the host architecture or use the '--container-runtime-args' flag to force platform emulation.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Create content collections and execution environments — This question tests Create content collections and execution environments — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The base image specified is incompatible with the host architecture. — Option D is correct because the error 'No matching manifest for linux/amd64 in the manifest list entries' indicates that the base image specified in the execution environment definition file does not have a container image manifest for the host's CPU architecture (linux/amd64). Ansible Builder pulls the base image from a registry, and if that image only supports other architectures (e.g., linux/arm64), the build fails. This is a common issue when using a base image built for a different platform.
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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