The answer is to update the bucket default encryption to SSE-KMS and then use S3 Batch Operations to re-encrypt existing objects. This is correct because changing the default encryption configuration only applies to newly uploaded objects, not to data already stored in the bucket. S3 Batch Operations allows you to perform bulk actions like copying objects with a new encryption setting, effectively re-encrypting them with your customer-managed KMS key without needing to re-upload. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding that default encryption is a forward-looking policy, while existing objects require a separate remediation step. A common trap is assuming that updating the default setting retroactively encrypts existing objects, or that Lifecycle policies can alter encryption. Remember the key distinction: default encryption governs the future, Batch Operations fixes the past. Memory tip: "Default for new, Batch for old."
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. 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 company uses Amazon S3 to store sensitive documents. The security policy requires that all objects in the bucket are encrypted at rest. The bucket currently has default encryption configured with SSE-S3. A new requirement mandates that all objects must be encrypted with SSE-KMS using a specific customer-managed key. What is the MOST efficient way to enforce this without re-uploading existing objects?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Update the bucket default encryption to SSE-KMS and use S3 Batch Operations to re-encrypt existing objects
Option C is correct because you can update the default encryption configuration to use SSE-KMS, and then use S3 Batch Operations to re-encrypt existing objects. Option A is wrong because changing the default encryption does not automatically re-encrypt existing objects. Option B is wrong because S3 Lifecycle policies do not re-encrypt objects. Option D is wrong because you cannot change encryption of existing objects by copying them in place; you need to copy to a new location.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use S3 Inventory to list objects and a script to copy each object to itself with new encryption
Why it's wrong here
Wrong: You cannot copy an object to itself; you need a different key or location.
✗
Use S3 Lifecycle policy to transition objects and re-encrypt them
Why it's wrong here
Wrong: Lifecycle policies do not re-encrypt objects.
✗
Update the bucket default encryption to SSE-KMS and enable automatic re-encryption
Why it's wrong here
Wrong: Default encryption only applies to new objects, not existing ones.
✓
Update the bucket default encryption to SSE-KMS and use S3 Batch Operations to re-encrypt existing objects
Why this is correct
Correct: S3 Batch Operations can copy objects with new encryption settings.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Protection — This question tests Data Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Update the bucket default encryption to SSE-KMS and use S3 Batch Operations to re-encrypt existing objects — Option C is correct because you can update the default encryption configuration to use SSE-KMS, and then use S3 Batch Operations to re-encrypt existing objects. Option A is wrong because changing the default encryption does not automatically re-encrypt existing objects. Option B is wrong because S3 Lifecycle policies do not re-encrypt objects. Option D is wrong because you cannot change encryption of existing objects by copying them in place; you need to copy to a new location.
What should I do if I get this SCS-C02 question wrong?
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SCS-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 SCS-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.