The answer is enabling S3 Block Public Access and configuring a bucket policy that denies access unless the request originates from a specific VPC or IP range. These two actions directly enforce network-level and account-level restrictions, preventing unauthorized access at the bucket’s perimeter. S3 Block Public Access acts as a centralized override that blocks all public access policies, while a condition key like aws:SourceIp in the bucket policy ensures only traffic from trusted IPs or VPC endpoints can reach the data. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this pairing tests your understanding of defense-in-depth for sensitive data—a common trap is confusing encryption or logging with access control, which do not block unauthorized requests. Remember the memory tip: “Block first, then lock the IP” to recall that S3 Block Public Access is the global kill switch, and the bucket policy is the granular gatekeeper.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 will improve the security posture of an Amazon S3 bucket used to store sensitive data? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable S3 Block Public Access settings at the account or bucket level.
Options B and D are correct. B: Enabling S3 Block Public Access prevents any public access to the bucket. D: Using bucket policies with condition keys such as aws:SourceIp restricts access to specific IP ranges. Option A is wrong because server access logs provide audit but do not improve security directly. Option C is wrong because encryption protects data at rest, not access control. Option E is wrong because versioning protects against accidental deletion but not unauthorized access.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Enable S3 Versioning on the bucket.
Why it's wrong here
Versioning protects against overwrites but not unauthorized access.
✓
Enable S3 Block Public Access settings at the account or bucket level.
Why this is correct
Block Public Access prevents any public access, improving security.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable default encryption using SSE-S3.
Why it's wrong here
Encryption protects data at rest but does not control access.
✗
Enable S3 server access logging for the bucket.
Why it's wrong here
Logging helps with auditing but does not prevent unauthorized access.
✓
Configure a bucket policy that denies access unless the request originates from a specific VPC or IP range.
Why this is correct
Restricting access by source IP or VPC limits exposure.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
Design for New Solutions — This question tests Design for New Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable S3 Block Public Access settings at the account or bucket level. — Options B and D are correct. B: Enabling S3 Block Public Access prevents any public access to the bucket. D: Using bucket policies with condition keys such as aws:SourceIp restricts access to specific IP ranges. Option A is wrong because server access logs provide audit but do not improve security directly. Option C is wrong because encryption protects data at rest, not access control. Option E is wrong because versioning protects against accidental deletion but not unauthorized access.
What should I do if I get this SAP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO actions improve the security of an Amazon S3 bucket that stores sensitive data?
medium
A.Enable CORS (Cross-Origin Resource Sharing).
✓ B.Enable S3 server access logging.
✓ C.Enable S3 Block Public Access.
D.Enable S3 Transfer Acceleration.
E.Use a bucket policy that denies access to all principals except the root user.
Why B: Options A and D are correct. Enabling S3 Block Public Access prevents any public access. Enabling S3 server access logging allows auditing. Option B is incorrect because bucket policies are not a substitute for encryption. Option C is incorrect because S3 Transfer Acceleration is for speed, not security. Option E is incorrect because CORS is for cross-origin requests, not security.
Last reviewed: Jun 20, 2026
Question Discussion
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This SAP-C02 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 SAP-C02 exam.
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