This CV0-004 practice question tests your understanding of security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO actions should a cloud administrator take to protect against data exfiltration from a cloud storage bucket? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement server-side encryption with SSE-S3.
Enabling object versioning allows recovery if data is deleted or overwritten but does not prevent exfiltration. Requiring MFA for delete operations prevents unauthorized deletion but not reading. Restricting public access and encrypting data at rest are effective controls against exfiltration. Audit logging is detective, not preventive.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 server-side encryption with SSE-S3.
Why this is correct
Encryption protects data at rest; even if exfiltrated, the data is unreadable without the key.
Related concept
Standard ACLs match source addresses.
✗
Enable object versioning on the bucket.
Why it's wrong here
Versioning helps with data recovery, not prevention of unauthorized access.
✗
Configure bucket access logs for monitoring.
Why it's wrong here
Logging is detective but does not prevent exfiltration.
✓
Block all public access by configuring bucket policies and ACLs.
Why this is correct
Public access is a common vector; blocking it reduces exposure.
Related concept
Standard ACLs match source addresses.
✗
Enable MFA delete on the bucket.
Why it's wrong here
MFA delete protects against unauthorized deletion, not reading or copying data.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CV0-004 ACL questions on filtering logic and placement.
Security — This question tests Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Implement server-side encryption with SSE-S3. — Enabling object versioning allows recovery if data is deleted or overwritten but does not prevent exfiltration. Requiring MFA for delete operations prevents unauthorized deletion but not reading. Restricting public access and encrypting data at rest are effective controls against exfiltration. Audit logging is detective, not preventive.
What should I do if I get this CV0-004 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CV0-004 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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