hardMultiple SelectObjective-mapped
CV0-004 Practice Question: A company experienced a security breach where an…
A company experienced a security breach where an attacker gained access to an S3 bucket containing sensitive data. The investigation reveals that the bucket policy allowed public access. Which THREE measures should be implemented to prevent future occurrences?
⚠ Common exam trap
CompTIA often tests the distinction between access control measures (like IP restrictions and Block Public Access) and data protection features (like encryption and versioning), leading candidates to select encryption or MFA as solutions for a public access breach.
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
✓
Implement bucket policies that require requests to include specific IP address conditions.
Implementing bucket policies that require requests to include specific IP address conditions restricts access to the S3 bucket to only those requests originating from trusted IP ranges. This is a form of network-level access control that, when combined with other measures, helps prevent unauthorized public access by ensuring that even if the bucket policy is misconfigured, only traffic from approved networks can reach the bucket.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Implement bucket policies that require requests to include specific IP address conditions.
Why this is correct
Restricts access to trusted IPs.
- ✗
Enable default encryption for all S3 buckets.
Why it's wrong here
Encryption does not prevent public access.
- ✓
Enable S3 versioning to safeguard against accidental modifications.
Why this is correct
Versioning allows recovery if data is overwritten.
- ✓
Enable S3 Block Public Access at the account level.
Why this is correct
Prevents any bucket from being made public.
- ✗
Enable multi-factor authentication (MFA) for all IAM users.
Why it's wrong here
MFA protects user credentials, not bucket policies.
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.