DEA-C01 Data Operations and Support Practice Question
Network Topology
Refer to the exhibit. A data engineer runs this CLI command to check an object's metadata. The engineer wants to verify if the object is eligible for lifecycle transition to S3 Glacier based on its age. What additional information is needed?
⚠ Common exam trap
DEA-C01 often tests whether candidates focus on object metadata like ETag or size when the actual lifecycle eligibility depends on object age (LastModified vs. current date) and rule thresholds.
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
✓
The current date
To determine whether an S3 object is eligible for lifecycle transition to S3 Glacier based on age, you need the object's creation date (LastModified) and the current date to compute its age. The exhibit presumably shows the object's LastModified timestamp, so the missing piece is the current date to calculate how many days old the object is relative to the lifecycle rule's transition threshold.
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 current date
Why this is correct
Lifecycle transition eligibility depends on the object's age, calculated as the current date minus LastModified. The CLI output supplies LastModified, so the current date is the missing value needed to determine whether the transition threshold has elapsed.
- ✗
The ETag value
Why it's wrong here
The ETag is an MD5-derived identifier used for integrity checking and conditional requests; it encodes no date, so it cannot establish object age. ETags matter when verifying uploads or managing multipart objects, not when determining lifecycle transition eligibility.
- ✗
The metadata archive flag
Why it's wrong here
No such metadata field exists in S3 object metadata; lifecycle evaluation depends on LastModified and storage class, not an archive flag. Inventing this field misdirects the engineer away from the timestamp actually required to assess age-based Glacier transition.
- ✗
The ContentLength value
Why it's wrong here
ContentLength gives object size, which lifecycle rules can filter on, but eligibility based on age requires the object's creation or last-modified timestamp, not its byte count. Size thresholds are relevant when configuring lifecycle rules that transition only objects above a certain size.
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 |
Go deeper
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.