The answer is to use AWS CloudFormation StackSets to deploy VPC flow log configurations across all accounts and regions, paired with a central S3 bucket policy that permits cross-account delivery. This approach is correct because StackSets automate the deployment of infrastructure as code to every member account in an AWS Organization, ensuring that when new accounts are added, they automatically receive the flow log setup without manual intervention. The S3 bucket policy must explicitly grant the necessary permissions for the VPC flow log service in each source account to write logs into the central logging bucket. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of multi-account governance and automation at scale—a common trap is choosing AWS Config, which can detect non-compliant resources but cannot automatically enable flow logs across all regions and new accounts. Remember the memory tip: StackSets for scale, S3 policy for central delivery.
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. 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 has multiple AWS accounts and wants to centrally manage VPC flow logs for all accounts. The flow logs should be sent to a central S3 bucket in the logging account. The solution must be automated for new accounts added to the organization. What should the team do?
Use AWS Config rules to detect missing flow logs and send alerts to the security team.
Why wrong: Does not automatically enable flow logs.
B
Use AWS CloudFormation StackSets to deploy a VPC flow log configuration to all accounts and regions, and configure the S3 bucket policy to allow cross-account delivery from all accounts.
StackSets automate deployment across accounts and regions.
C
Use an SCP to require that VPC flow logs be enabled.
Why wrong: SCPs cannot enable features; they only deny or allow actions.
D
Manually enable VPC flow logs in each account and region, and specify the central S3 bucket as the destination.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS CloudFormation StackSets to deploy a VPC flow log configuration to all accounts and regions, and configure the S3 bucket policy to allow cross-account delivery from all accounts.
Option D is correct because AWS CloudFormation StackSets can deploy the flow log configuration to all accounts and regions, and a central S3 bucket policy allows cross-account delivery. Option A is wrong because manual creation does not scale. Option B is wrong because SCPs cannot create resources. Option C is wrong because AWS Config can detect but not automatically enable in all regions easily.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 AWS Config rules to detect missing flow logs and send alerts to the security team.
Why it's wrong here
Does not automatically enable flow logs.
✓
Use AWS CloudFormation StackSets to deploy a VPC flow log configuration to all accounts and regions, and configure the S3 bucket policy to allow cross-account delivery from all accounts.
Why this is correct
StackSets automate deployment across accounts and regions.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use an SCP to require that VPC flow logs be enabled.
Why it's wrong here
SCPs cannot enable features; they only deny or allow actions.
✗
Manually enable VPC flow logs in each account and region, and specify the central S3 bucket as the destination.
Why it's wrong here
Does not scale to many accounts.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use AWS CloudFormation StackSets to deploy a VPC flow log configuration to all accounts and regions, and configure the S3 bucket policy to allow cross-account delivery from all accounts. — Option D is correct because AWS CloudFormation StackSets can deploy the flow log configuration to all accounts and regions, and a central S3 bucket policy allows cross-account delivery. Option A is wrong because manual creation does not scale. Option B is wrong because SCPs cannot create resources. Option C is wrong because AWS Config can detect but not automatically enable in all regions easily.
What should I do if I get this SAP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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