- A
Enable encryption on VPC Flow Logs using a KMS key in each account and aggregate logs using AWS Logs cross-account subscription.
Why wrong: Cross-account subscription is complex and not directly to S3.
- B
Create a centralized S3 bucket with default encryption using a KMS CMK and a bucket policy that allows cross-account writes from the source accounts.
This ensures encryption and centralized logging.
- C
Create a bucket with SSE-S3 encryption and have each account write flow logs directly.
Why wrong: SSE-S3 uses Amazon S3-managed keys, not a CMK.
- D
Use a single bucket with a bucket policy that denies access unless encryption headers are present, and use a KMS key shared across accounts.
Why wrong: This does not ensure encryption at rest, only enforces headers.
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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 centralize logging of VPC Flow Logs from multiple accounts into a single Amazon S3 bucket. The logs must be encrypted at rest using an AWS KMS CMK. What is the recommended approach?
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
Create a centralized S3 bucket with default encryption using a KMS CMK and a bucket policy that allows cross-account writes from the source accounts.
Option B is correct because the recommended approach uses a centralized S3 bucket with default encryption using a KMS CMK and a bucket policy that allows cross-account writes. This ensures logs are encrypted at rest centrally without requiring per-account KMS keys. Option A is wrong because KMS keys in each account would complicate key management and cross-account access. Option C is wrong because SSE-S3 encryption does not use a CMK and does not provide the same level of control. Option D is wrong because denying access unless encryption headers are present is not a reliable way to enforce encryption; bucket policies can be bypassed if headers are not included, and shared KMS keys are not recommended.
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.
- ✗
Enable encryption on VPC Flow Logs using a KMS key in each account and aggregate logs using AWS Logs cross-account subscription.
Why it's wrong here
Cross-account subscription is complex and not directly to S3.
- ✓
Create a centralized S3 bucket with default encryption using a KMS CMK and a bucket policy that allows cross-account writes from the source accounts.
Why this is correct
This ensures encryption and centralized logging.
Related concept
Standard ACLs match source addresses.
- ✗
Create a bucket with SSE-S3 encryption and have each account write flow logs directly.
Why it's wrong here
SSE-S3 uses Amazon S3-managed keys, not a CMK.
- ✗
Use a single bucket with a bucket policy that denies access unless encryption headers are present, and use a KMS key shared across accounts.
Why it's wrong here
This does not ensure encryption at rest, only enforces headers.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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 ANS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create a centralized S3 bucket with default encryption using a KMS CMK and a bucket policy that allows cross-account writes from the source accounts. — Option B is correct because the recommended approach uses a centralized S3 bucket with default encryption using a KMS CMK and a bucket policy that allows cross-account writes. This ensures logs are encrypted at rest centrally without requiring per-account KMS keys. Option A is wrong because KMS keys in each account would complicate key management and cross-account access. Option C is wrong because SSE-S3 encryption does not use a CMK and does not provide the same level of control. Option D is wrong because denying access unless encryption headers are present is not a reliable way to enforce encryption; bucket policies can be bypassed if headers are not included, and shared KMS keys are not recommended.
What should I do if I get this ANS-C01 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 ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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