The answer is to change the bucket’s default encryption configuration from SSE-S3 to SSE-KMS, which is the simplest way to switch S3 encryption to SSE-KMS for new objects. This works because default encryption settings apply automatically to all newly uploaded objects, encrypting them with the specified AWS KMS key without requiring any changes to existing objects or re-uploading data. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this question tests your understanding that default encryption is a configuration-level change, not a data migration task—a common trap is assuming you need lifecycle policies or bucket policies to alter encryption, but those tools manage object transitions or access control, not encryption keys. Remember that default encryption only affects future uploads; existing objects remain encrypted with their original SSE-S3 keys unless you explicitly copy them. Memory tip: “Default for new, copy for old” helps you recall that changing the default encryption configuration is the simplest path for new data, while existing objects require a separate copy operation to re-encrypt.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company is using Amazon S3 to store sensitive customer data. The security team requires that all data be encrypted at rest. Currently, the S3 bucket uses server-side encryption with S3 managed keys (SSE-S3). The company wants to use a key stored in AWS KMS for additional control. What is the simplest way to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change the bucket's default encryption configuration to SSE-KMS.
Option C is correct because changing the default encryption configuration to SSE-KMS automatically encrypts new objects with the specified KMS key without re-uploading existing objects. Option A is incorrect because a lifecycle policy does not change encryption. Option B is incorrect because bucket policies do not control encryption keys. Option D is incorrect because existing objects are not re-encrypted by default encryption changes.
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.
✗
Add a lifecycle policy to transition objects to SSE-KMS.
Why it's wrong here
Lifecycle policies do not modify encryption settings.
✗
Use S3 Batch Operations to copy objects and re-encrypt with SSE-KMS.
Why it's wrong here
This is more complex and not the simplest method.
✓
Change the bucket's default encryption configuration to SSE-KMS.
Why this is correct
Default encryption applies automatically to all new objects; existing objects remain with SSE-S3.
Related concept
Standard ACLs match source addresses.
✗
Use a bucket policy to deny uploads without SSE-KMS.
Why it's wrong here
This only enforces encryption for future uploads but does not encrypt existing objects.
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 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 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 SAP-C02 ACL questions on filtering logic and placement.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Change the bucket's default encryption configuration to SSE-KMS. — Option C is correct because changing the default encryption configuration to SSE-KMS automatically encrypts new objects with the specified KMS key without re-uploading existing objects. Option A is incorrect because a lifecycle policy does not change encryption. Option B is incorrect because bucket policies do not control encryption keys. Option D is incorrect because existing objects are not re-encrypted by default encryption changes.
What should I do if I get this SAP-C02 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 SAP-C02 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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