This DOP-C02 practice question tests your understanding of monitoring and logging. 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.
Exhibit
S3 bucket policy:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": "*",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::confidential/*",
"Condition": {
"IpAddress": {
"aws:SourceIp": "10.0.0.0/24"
}
}
}
]
}
CloudFront distribution with S3 origin. Viewer requests go through CloudFront.
Error log from S3 access logs:
2024-06-01 12:00:00 10.0.0.50 GET /secret.pdf 403 AccessDenied
Refer to the exhibit. A user from IP 10.0.0.50 receives a 403 error when accessing https://d123.cloudfront.net/secret.pdf. The S3 bucket policy is as shown. What is the most likely cause of the error?
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.
Exhibit
S3 bucket policy:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": "*",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::confidential/*",
"Condition": {
"IpAddress": {
"aws:SourceIp": "10.0.0.0/24"
}
}
}
]
}
CloudFront distribution with S3 origin. Viewer requests go through CloudFront.
Error log from S3 access logs:
2024-06-01 12:00:00 10.0.0.50 GET /secret.pdf 403 AccessDenied
A
The S3 bucket policy should use 'Principal": { "AWS": "cloudfront.amazonaws.com" }'.
Why wrong: While that is a valid approach, the issue is the IP condition. The bucket policy as is would work if the IP condition were removed or if CloudFront's IP were in the range.
B
The CloudFront distribution does not have an Origin Access Control (OAC) configured.
Without OAC, CloudFront does not have permission to access S3 objects that are restricted by IP condition. OAC allows CloudFront to access S3 without relying on the bucket policy IP condition.
C
The S3 bucket policy does not allow s3:GetObject from CloudFront.
Why wrong: The policy allows s3:GetObject from any principal, but the condition restricts by IP. CloudFront's IP is not in the allowed range.
D
The user's IP address is not in the allowed range.
Why wrong: The user's IP is in the allowed range, but S3 sees CloudFront's IP, not the user's.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The CloudFront distribution does not have an Origin Access Control (OAC) configured.
The S3 bucket policy restricts access to requests originating from IP range 10.0.0.0/24. However, when using CloudFront to serve S3 content, the IP address seen by S3 is the CloudFront origin IP, not the viewer's IP. Therefore, the condition fails unless CloudFront's IP is within the range, which it is not. The correct fix is to use CloudFront's Origin Access Control (OAC) and remove the IP condition or use CloudFront functions to forward the viewer IP.
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 S3 bucket policy should use 'Principal": { "AWS": "cloudfront.amazonaws.com" }'.
Why it's wrong here
While that is a valid approach, the issue is the IP condition. The bucket policy as is would work if the IP condition were removed or if CloudFront's IP were in the range.
✓
The CloudFront distribution does not have an Origin Access Control (OAC) configured.
Why this is correct
Without OAC, CloudFront does not have permission to access S3 objects that are restricted by IP condition. OAC allows CloudFront to access S3 without relying on the bucket policy IP condition.
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 S3 bucket policy does not allow s3:GetObject from CloudFront.
Why it's wrong here
The policy allows s3:GetObject from any principal, but the condition restricts by IP. CloudFront's IP is not in the allowed range.
✗
The user's IP address is not in the allowed range.
Why it's wrong here
The user's IP is in the allowed range, but S3 sees CloudFront's IP, not the user's.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
Storage Class
Min Duration
Retrieval
Use Case
S3 Standard
None
Immediate
Frequently accessed data
S3 Standard-IA
30 days
Immediate
Infrequent access, rapid retrieval
S3 One Zone-IA
30 days
Immediate
Non-critical infrequent data
S3 Intelligent-Tiering
None
Immediate–hours
Unknown or changing access patterns
S3 Glacier Instant
90 days
Milliseconds
Archive with instant retrieval
S3 Glacier Flexible
90 days
Minutes–hours
Archive, flexible retrieval
S3 Glacier Deep Archive
180 days
Hours
Long-term compliance archive
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Monitoring and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CloudFront distribution does not have an Origin Access Control (OAC) configured. — The S3 bucket policy restricts access to requests originating from IP range 10.0.0.0/24. However, when using CloudFront to serve S3 content, the IP address seen by S3 is the CloudFront origin IP, not the viewer's IP. Therefore, the condition fails unless CloudFront's IP is within the range, which it is not. The correct fix is to use CloudFront's Origin Access Control (OAC) and remove the IP condition or use CloudFront functions to forward the viewer IP.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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