- A
Enable default encryption on each S3 bucket and create a CloudWatch alarm to notify if unencrypted objects are uploaded.
Why wrong: Default encryption does not prevent unencrypted uploads; it only encrypts after upload.
- B
Use an S3 bucket policy with a Deny statement for s3:PutObject without encryption applied to all buckets via a single policy.
Why wrong: Bucket policies are per-bucket, not global.
- C
Use AWS CloudTrail to monitor PutObject calls and trigger an AWS Lambda function to delete unencrypted objects.
Why wrong: CloudTrail can log but not enforce; deleting objects is reactive and not a best practice.
- D
Use an S3 bucket policy on each bucket that denies s3:PutObject if the x-amz-server-side-encryption header is not present.
This denies uploads without encryption, enforcing encryption at upload.
Quick Answer
The answer is to use an S3 bucket policy that denies the s3:PutObject action unless the x-amz-server-side-encryption header is present. This works because the policy evaluates the request at upload time, rejecting any PUT that lacks the encryption header, thereby enforcing server-side encryption before the object is written. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding that bucket policies are the only way to actively enforce encryption at the upload moment, unlike default encryption which only applies passively when no header is specified. A common trap is confusing default encryption with enforcement—default encryption does not prevent unencrypted uploads, while a Deny policy does. For a memory tip, remember: “Deny the headerless PUT” to enforce encryption at the gate.
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A SysOps administrator needs to ensure that all Amazon S3 buckets in an AWS account are encrypted at rest using server-side encryption. Which combination of actions should be taken to enforce this policy?
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
Use an S3 bucket policy on each bucket that denies s3:PutObject if the x-amz-server-side-encryption header is not present.
Option D is correct because using an S3 bucket policy with a Deny for s3:PutObject without the x-amz-server-side-encryption header enforces encryption at upload time. Option A is wrong because bucket policies cannot be applied to all buckets at once; each bucket needs its own policy. Option B is wrong because enabling default encryption on existing buckets does not prevent unencrypted uploads (default applies if no header is specified). Option C is wrong because CloudTrail can log but not enforce encryption.
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 default encryption on each S3 bucket and create a CloudWatch alarm to notify if unencrypted objects are uploaded.
Why it's wrong here
Default encryption does not prevent unencrypted uploads; it only encrypts after upload.
- ✗
Use an S3 bucket policy with a Deny statement for s3:PutObject without encryption applied to all buckets via a single policy.
Why it's wrong here
Bucket policies are per-bucket, not global.
- ✗
Use AWS CloudTrail to monitor PutObject calls and trigger an AWS Lambda function to delete unencrypted objects.
Why it's wrong here
CloudTrail can log but not enforce; deleting objects is reactive and not a best practice.
- ✓
Use an S3 bucket policy on each bucket that denies s3:PutObject if the x-amz-server-side-encryption header is not present.
Why this is correct
This denies uploads without encryption, enforcing encryption at upload.
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 SOA-C02 NAT questions on configuration and troubleshooting.
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Security and Compliance — study guide chapter
Learn the concepts, then practise the questions
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Security and Compliance practice questions
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Security and Compliance — This question tests Security and Compliance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use an S3 bucket policy on each bucket that denies s3:PutObject if the x-amz-server-side-encryption header is not present. — Option D is correct because using an S3 bucket policy with a Deny for s3:PutObject without the x-amz-server-side-encryption header enforces encryption at upload time. Option A is wrong because bucket policies cannot be applied to all buckets at once; each bucket needs its own policy. Option B is wrong because enabling default encryption on existing buckets does not prevent unencrypted uploads (default applies if no header is specified). Option C is wrong because CloudTrail can log but not enforce encryption.
What should I do if I get this SOA-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 SOA-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.
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Last reviewed: Jun 20, 2026
This SOA-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 SOA-C02 exam.
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