The correct answer is to use server-side encryption with AWS KMS (SSE-KMS) and server-side encryption with S3 managed keys (SSE-S3), as both are native S3 at-rest encryption methods that encrypt objects before they are written to disk and decrypt them upon retrieval. SSE-S3 uses Amazon’s own key management, while SSE-KMS provides separate customer master keys with additional control, audit trails, and automatic rotation via AWS KMS. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your ability to distinguish between S3’s server-side encryption options and common distractors like client-side encryption (which happens outside S3) or encryption in transit (which protects data during transfer). A frequent trap is confusing SSE-KMS with client-side encryption or assuming all encryption options are server-side. Remember the memory tip: “SSE is S3’s own job; KMS adds key control, S3 keeps it simple.”
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. 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.
A company wants to protect sensitive data in Amazon S3 by ensuring that all objects are encrypted at rest. Which TWO options meet this requirement? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use server-side encryption with S3 managed keys (SSE-S3)
Options A and C are correct encryption methods provided by S3. Option B is for client-side, but not S3's own encryption. Option D is for data in transit. Option E is for masking, not encryption.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 server-side encryption with S3 managed keys (SSE-S3)
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SCS-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Data Protection — This question tests Data Protection — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use server-side encryption with S3 managed keys (SSE-S3) — Options A and C are correct encryption methods provided by S3. Option B is for client-side, but not S3's own encryption. Option D is for data in transit. Option E is for masking, not encryption.
What should I do if I get this SCS-C02 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SCS-C02 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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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
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