The answer is setting a bucket policy that denies uploads without encryption and using S3 server-side encryption. These two methods directly enforce at-rest encryption by ensuring that any object written to the bucket must be encrypted before storage, either through a default bucket encryption setting or by requiring the x-amz-server-side-encryption header in upload requests. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of how to combine IAM-based policy conditions with S3’s native encryption features to meet compliance requirements. A common trap is confusing client-side encryption, which is managed by the customer and not enforced by AWS, with server-side options that the service controls. Another pitfall is mistaking S3 Transfer Acceleration or VPC endpoints for encryption mechanisms when they only address performance or private connectivity. Memory tip: think “policy plus SSE” — the bucket policy acts as a gatekeeper that rejects unencrypted uploads, while server-side encryption handles the actual cryptographic protection.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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.
A company wants to secure data at rest in an Amazon S3 bucket. Which TWO of the following can be used to achieve this? (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 server-side encryption (SSE-S3) on the bucket.
S3 server-side encryption and default bucket encryption enforce at-rest encryption. Options A and C are correct. Option B is wrong because client-side encryption is not managed by AWS. Option D is wrong because S3 Transfer Acceleration is for speed. Option E is wrong because VPC endpoint is for private connectivity.
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.
✓
Enable server-side encryption (SSE-S3) on the bucket.
Read the scenario before looking for a memorised answer.
✗
Use an S3 VPC endpoint.
Why it's wrong here
This provides private connectivity, not encryption.
✓
Set a bucket policy that denies uploads without encryption.
Why this is correct
Enforces encryption at upload time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use client-side encryption with AWS KMS.
Why it's wrong here
Client-side encryption is performed by the client, not managed by S3.
✗
Enable S3 Transfer Acceleration.
Why it's wrong here
This improves upload speed, not encryption.
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 ANS-C01 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.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable server-side encryption (SSE-S3) on the bucket. — S3 server-side encryption and default bucket encryption enforce at-rest encryption. Options A and C are correct. Option B is wrong because client-side encryption is not managed by AWS. Option D is wrong because S3 Transfer Acceleration is for speed. Option E is wrong because VPC endpoint is for private connectivity.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 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 →
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 are valid methods to encrypt data at rest in Amazon S3? (Choose TWO.)
easy
A.SSE-C
B.Client-Side Encryption
C.SSL/TLS
✓ D.SSE-S3
✓ E.SSE-KMS
Why D: Options B and C are correct. SSE-S3 and SSE-KMS are two server-side encryption options. Option A is wrong because SSL/TLS is for data in transit. Option D is wrong because Client-Side Encryption is not server-side. Option E is wrong because SSE-C is also valid, but the question asks for TWO, and SSE-S3 and SSE-KMS are the most common.
Variation 2. Which TWO of the following are valid methods to secure data at rest in Amazon S3? (Choose two.)
medium
✓ A.Use SSE-S3 (Server-Side Encryption with S3 managed keys).
B.Use SSL/TLS to encrypt data during transfer.
✓ C.Use client-side encryption before uploading objects.
D.Use a VPC endpoint to restrict access to the bucket.
E.Configure a network ACL to block unauthorized access.
Why A: Options B and C are correct. Server-side encryption with S3 managed keys (SSE-S3) is a valid method. Client-side encryption where the customer encrypts data before uploading is also valid. Option A is incorrect because SSL/TLS encrypts data in transit, not at rest. Option D is incorrect because network ACLs do not encrypt data. Option E is incorrect because VPC endpoints do not encrypt data.
Last reviewed: Jun 20, 2026
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This ANS-C01 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 ANS-C01 exam.
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