- A
NumberOfObjects metric with the ObjectType dimension.
Why wrong: The NumberOfObjects metric counts objects in the bucket, not errors. The ObjectType dimension filters by storage class or object type. This does not monitor PUT request errors.
- B
BucketSizeBytes metric with the StorageType dimension.
Why wrong: The BucketSizeBytes metric measures bucket storage size, not errors. The StorageType dimension indicates storage tier. This is irrelevant for monitoring 403 errors.
- C
4xxErrors metric with the FilterId dimension set to '403'
The 4xxErrors metric counts HTTP 4xx errors. Setting the FilterId dimension to '403' filters for 403 AccessDenied errors, making this the correct choice.
- D
AllRequests metric with the BucketName dimension.
Why wrong: The AllRequests metric counts all requests, including successful ones. The BucketName dimension identifies the bucket but does not isolate error codes. This does not specifically monitor 403 errors.
How to Monitor S3 403 AccessDenied Errors Using CloudWatch
This DEA-C01 practice question tests your understanding of data operations and support. 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. A key principle to apply: s3 CloudWatch 4xxErrors metric. 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 data engineer needs to monitor the number of Amazon S3 PUT requests that result in a 403 AccessDenied error. Which CloudWatch metric and dimension should be used?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
4xxErrors metric with the FilterId dimension set to '403'
Option C is correct. The 4xxErrors metric tracks HTTP 4xx errors for an S3 bucket. By setting the FilterId dimension to '403', you can filter specifically for 403 AccessDenied errors, allowing monitoring of PUT requests that result in AccessDenied.
Key principle: S3 CloudWatch 4xxErrors metric
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NumberOfObjects metric with the ObjectType dimension.
Why it's wrong here
The NumberOfObjects metric counts objects in the bucket, not errors. The ObjectType dimension filters by storage class or object type. This does not monitor PUT request errors.
- ✗
BucketSizeBytes metric with the StorageType dimension.
Why it's wrong here
The BucketSizeBytes metric measures bucket storage size, not errors. The StorageType dimension indicates storage tier. This is irrelevant for monitoring 403 errors.
- ✓
4xxErrors metric with the FilterId dimension set to '403'
- ✗
AllRequests metric with the BucketName dimension.
Why it's wrong here
The AllRequests metric counts all requests, including successful ones. The BucketName dimension identifies the bucket but does not isolate error codes. This does not specifically monitor 403 errors.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may incorrectly assume that the 4xxErrors metric cannot be filtered by specific status codes. However, with the FilterId dimension set to '403', you can target 403 errors specifically. This is a valid approach within S3 CloudWatch request metrics.
Detailed technical explanation
How to think about this question
Under the hood, S3 CloudWatch metrics are published at 1-minute granularity, and the `4xxErrors` metric aggregates all client-side errors (400–499). To isolate 403 errors, you must configure a CloudWatch metric filter on the S3 access logs or use S3 server access logs with a filter pattern like `"HTTP 403"` and then create a custom metric. The `FilterId` dimension in option C refers to a predefined filter that matches the 403 status code in the `4xxErrors` metric, which is a common pattern in exam scenarios.
KKey Concepts to Remember
- S3 CloudWatch 4xxErrors metric
- FilterId dimension
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
S3 CloudWatch 4xxErrors metric
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.
Review s3 CloudWatch 4xxErrors metric, then practise related DEA-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Operations and Support — This question tests Data Operations and Support — S3 CloudWatch 4xxErrors metric.
What is the correct answer to this question?
The correct answer is: 4xxErrors metric with the FilterId dimension set to '403' — Option C is correct. The 4xxErrors metric tracks HTTP 4xx errors for an S3 bucket. By setting the FilterId dimension to '403', you can filter specifically for 403 AccessDenied errors, allowing monitoring of PUT requests that result in AccessDenied.
What should I do if I get this DEA-C01 question wrong?
Review s3 CloudWatch 4xxErrors metric, then practise related DEA-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
S3 CloudWatch 4xxErrors metric
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Last reviewed: Jun 24, 2026
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