DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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.
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 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'
The correct answer is C because Amazon S3 CloudWatch metrics include `4xxErrors`, which counts HTTP 4xx status code responses. To filter specifically for 403 AccessDenied errors, you set the `FilterId` dimension to a filter that matches the 403 status code. This allows precise monitoring of unauthorized PUT requests.
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.
✗
NumberOfObjects metric with the ObjectType dimension.
Why it's wrong here
NumberOfObjects is for object count, not errors.
✗
BucketSizeBytes metric with the StorageType dimension.
Why it's wrong here
BucketSizeBytes is for storage, not request errors.
✓
4xxErrors metric with the FilterId dimension set to '403'
Why this is correct
4xxErrors metric with a filter for 403 provides the count of AccessDenied errors.
Related concept
Read the scenario before looking for a memorised answer.
✗
AllRequests metric with the BucketName dimension.
Why it's wrong here
AllRequests does not filter by error code.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `4xxErrors` (which counts all 4xx errors) with a metric that directly counts 403 errors, forgetting that a dimension filter is required to isolate the specific status code.
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
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 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.
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.
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 4xxErrors metric with the FilterId dimension set to '403' — The correct answer is C because Amazon S3 CloudWatch metrics include `4xxErrors`, which counts HTTP 4xx status code responses. To filter specifically for 403 AccessDenied errors, you set the `FilterId` dimension to a filter that matches the 403 status code. This allows precise monitoring of unauthorized PUT requests.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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