DEA-C01 Data Store Management Practice Question
Network Topology
A data engineer runs the above AWS CLI command and receives the output. The object is part of an S3 Lifecycle policy that transitions objects to Glacier Instant Retrieval after 30 days. The object was created on January 1, 2023. Why is the object still in STANDARD_IA storage class?
⚠ Common exam trap
Test-takers frequently assume the object's current storage class (STANDARD_IA) means the 30-day transition to Glacier Instant Retrieval has already failed or been misconfigured, when in fact the object simply hasn't aged enough yet.
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 object has not reached the transition age of 30 days yet
The S3 Lifecycle rule transitions objects to Glacier Instant Retrieval after 30 days, but the object was created on January 1, 2023, and the current date (implied by the command output) is before January 31, 2023. The transition age is calculated from the object's LastModified date, not from any other timestamp, and the object must be at least 30 days old before S3 applies the transition. Since the object is only 20 days old (as of January 21, 2023, based on the output showing STANDARD_IA), it has not yet met the 30-day 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 Lifecycle policy has a filter that excludes this object's prefix
Why it's wrong here
The command shows the object is in the logs/ prefix, which is likely included.
- ✗
Versioning is enabled and the current version is not the oldest
Why it's wrong here
VersionId is null, so versioning is not enabled.
- ✓
The object has not reached the transition age of 30 days yet
Why this is correct
The LastModified is Jan 2, so as of Jan 3, it is only 1 day old.
- ✗
The metadata timestamp is used for lifecycle transitions instead of LastModified
Why it's wrong here
Lifecycle policies use the object's LastModified date, not custom metadata.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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