MLS-C01 Exploratory Data Analysis Practice Question

Network Topology

A data scientist runs the following AWS CLI command:

aws s3api head-object --bucket my-bucket --key data.csv

The output is:

{
    "AcceptRanges": "bytes",
    "LastModified": "2021-08-21T12:00:00+00:00",
    "ContentLength": 1048576,
    "ETag": "\"d41d8cd98f00b204e9800998ecf8427e\"",
    "ContentType": "text/csv",
    "Metadata": {}
}

What can be concluded from the output?

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 ETag can be used for integrity checking.

The ETag can be used for integrity checking, as it is an MD5 hash of the object content. Option B is wrong because ContentLength 1048576 corresponds to 1 MB, not 1 GB. Option C is wrong because S3 versioning is indicated by VersionId, not ETag. Option D is wrong because the output does not provide any information about preprocessing; the presence of metadata like 'preprocessed' is 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.

✓
The ETag can be used for integrity checking.
Why this is correct
The ETag can be used for integrity checking, as it is an MD5 hash of the object content.
✗
The file is 1 GB in size.
Why it's wrong here
ContentLength 1048576 corresponds to 1 MB, not 1 GB.
✗
The object has S3 versioning enabled.
Why it's wrong here
S3 versioning is indicated by VersionId, not ETag.
✗
The file has not been preprocessed.
Why it's wrong here
D is wrong because the output includes metadata such as 'preprocessed: true', which indicates the file has been preprocessed, not that it hasn't.

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

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MLS-C01 Exploratory Data Analysis Practice Question

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

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