MLS-C01 Exploratory Data Analysis Practice Question
Network Topology
A data scientist is exploring log files stored in S3. They ran the above AWS CLI command. What does the output indicate about the data, and what EDA step should be taken next?
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
✓
There are 3 log files larger than 100KB in the specified prefix.
The command `aws s3api list-objects-v2 --bucket <bucket> --prefix logs/2023/ --query 'Contents[?Size > `100000`].[Key,Size]' --output text` lists objects under the specified prefix with a size greater than 100000 bytes (≈100 KB). The output shows three objects, indicating there are three log files larger than 100 KB. Option A is incorrect because the output does not provide exact size ranges (e.g., 150KB-200KB); it only indicates files exceeding 100 KB. Option B is incorrect because the command filters by size, so it does not count all objects in the bucket under the prefix. Option D is incorrect because it states the prefix contains exactly three objects, but the command only returns objects larger than the threshold; there may be additional smaller objects not shown.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All log files are about 150KB-200KB in size.
Why it's wrong here
Only files >100KB are shown; smaller files are omitted.
- ✗
There are 3 objects in the bucket under the prefix.
Why it's wrong here
The command only shows objects larger than 100000 bytes; there may be more smaller objects.
- ✓
There are 3 log files larger than 100KB in the specified prefix.
Why this is correct
The command filters by size >100000 bytes and returns keys and sizes.
- ✗
The prefix 'logs/2023/' contains exactly 3 objects.
Why it's wrong here
The command filters, so it does not show all objects.
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 by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This MLS-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 MLS-C01 exam.