The answer is to enable VPC Flow Logs and publish them to a central S3 bucket, then use Amazon Athena to query the logs. This is correct because VPC Flow Logs capture IP traffic metadata—not full packets—and can be centrally aggregated across accounts via a transit gateway and a central logging account, while Athena provides a serverless, pay-per-query engine that scales automatically and incurs cost only for data scanned, making it the most scalable and cost-effective solution for monitoring VPC traffic between accounts. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your ability to balance operational overhead with cost, often contrasting serverless Athena against provisioning a full Amazon OpenSearch Service cluster or using third-party tools that charge per GB ingested. A common trap is selecting a solution that captures full packets or requires managing EC2 instances for log analysis, which violates the “cost-effective” constraint. Memory tip: think “Flow to S3, Athena for free”—the logs flow centrally, and Athena queries only what you need.
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. 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's AWS environment includes multiple VPCs across several accounts that are connected via a transit gateway. The network team wants to monitor all network traffic between VPCs for security analysis. Which solution is the most scalable and cost-effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable VPC Flow Logs and publish them to a central S3 bucket, then use Amazon Athena to query the logs.
Option B is correct because VPC Flow Logs capture IP traffic metadata (not full packets) and can be centrally published to an S3 bucket across accounts using a central logging account. Querying with Athena is serverless, scales automatically, and incurs cost only for data scanned, making it the most scalable and cost-effective solution for security analysis of inter-VPC traffic.
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 AWS Traffic Mirroring to mirror all traffic to a central inspection appliance.
Why it's wrong here
High cost and complexity.
✓
Enable VPC Flow Logs and publish them to a central S3 bucket, then use Amazon Athena to query the logs.
Why this is correct
Scalable and cost-effective.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable VPC Flow Logs for each VPC and stream them to Amazon CloudWatch Logs in each account.
Why it's wrong here
Logs are not centralized.
✗
Place a network load balancer in each VPC and capture traffic using a packet sniffer.
Why it's wrong here
Not designed for traffic monitoring.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may over-engineer the solution by choosing Traffic Mirroring or NLB-based packet capture, thinking full packet inspection is needed, when metadata from Flow Logs is sufficient for security analysis and far more cost-effective at scale.
Detailed technical explanation
How to think about this question
VPC Flow Logs capture metadata such as source/destination IP, ports, protocol, packet count, and byte count, but not payload data. Publishing to S3 enables partitioning by AWS region and date, allowing Athena to use Hive-style partitions for efficient querying. The cost model is based on S3 storage and Athena data scanned, which is far cheaper than streaming all logs to CloudWatch Logs or running a full packet inspection appliance.
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.
TExam Day Tips
→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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable VPC Flow Logs and publish them to a central S3 bucket, then use Amazon Athena to query the logs. — Option B is correct because VPC Flow Logs capture IP traffic metadata (not full packets) and can be centrally published to an S3 bucket across accounts using a central logging account. Querying with Athena is serverless, scales automatically, and incurs cost only for data scanned, making it the most scalable and cost-effective solution for security analysis of inter-VPC traffic.
What should I do if I get this SAP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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