This CV0-004 practice question tests your understanding of operations and support. 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.
A cloud administrator is troubleshooting an issue where users from the 192.0.2.0/24 network cannot access objects in an S3 bucket. The bucket policy is shown in the exhibit. What is the most likely cause of the issue?
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 policy does not grant the s3:ListBucket action.
The bucket policy grants s3:GetObject but not s3:ListBucket. Without s3:ListBucket, users cannot list the objects in the bucket, so they cannot discover the object keys needed to access objects. Even if they know the exact object key, the missing ListBucket action prevents the initial listing operation, which is required for many S3 access patterns.
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 condition uses an incorrect IP address format.
The policy does not grant the s3:ListBucket action.
Why this is correct
Without ListBucket, users cannot list objects, only get them if they know the exact key.
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.
✗
The policy is missing a required statement ID.
Why it's wrong here
Statement ID is optional in bucket policies.
✗
The resource ARN does not include the bucket itself.
Why it's wrong here
The ARN includes the bucket and objects via /*.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between object-level actions (s3:GetObject) and bucket-level actions (s3:ListBucket), trapping candidates who assume that granting read access automatically includes listing permissions.
Detailed technical explanation
How to think about this question
S3 bucket policies use IAM policy language where each action must be explicitly granted. The s3:ListBucket action is required for the ListObjects API call, which is the first step when users browse or access objects via the S3 console or CLI. Without it, even if s3:GetObject is granted, users receive an AccessDenied error when trying to list the bucket contents. This is a common misconfiguration where administrators grant read access but forget the list permission.
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.
Operations and Support — This question tests Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The policy does not grant the s3:ListBucket action. — The bucket policy grants s3:GetObject but not s3:ListBucket. Without s3:ListBucket, users cannot list the objects in the bucket, so they cannot discover the object keys needed to access objects. Even if they know the exact object key, the missing ListBucket action prevents the initial listing operation, which is required for many S3 access patterns.
What should I do if I get this CV0-004 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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