The correct answer is to enable VPC Flow Logs to capture network traffic and CloudTrail to capture API calls, then correlate VPC Flow Logs and CloudTrail for investigations. This combination is essential because VPC Flow Logs provide metadata about every network packet allowed or denied by security groups and network ACLs, while CloudTrail records all API actions taken within the AWS account, such as S3 GetObject or EC2 RunInstances. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding that neither service alone gives a complete picture—CloudTrail misses raw network flows, and VPC Flow Logs miss user and service API activity. A common trap is choosing only one service, but the key is that data exfiltration often involves both an API call (e.g., to download data) and the actual network transfer. Memory tip: think “API calls = CloudTrail, network flows = Flow Logs; to catch exfiltration, you need both trails.”
SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. 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 security engineer is investigating a potential data exfiltration incident. The engineer has enabled VPC Flow Logs for the VPC and CloudTrail for the account. Which combination of actions would provide the most comprehensive visibility into network traffic and API calls?
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 to capture network traffic and use CloudTrail to capture API calls. Correlate both logs for a complete view.
VPC Flow Logs capture network traffic metadata, and CloudTrail captures API calls. Analyzing both together provides a complete picture. Option B is correct because it combines both services. Option A is wrong because CloudTrail alone does not capture network traffic. Option C is wrong because VPC Flow Logs do not capture API calls. Option D is wrong because Config does not log API calls or network traffic.
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.
✓
Enable VPC Flow Logs to capture network traffic and use CloudTrail to capture API calls. Correlate both logs for a complete view.
Why this is correct
Both services together provide comprehensive visibility.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use AWS Config to track resource changes and CloudTrail to detect network anomalies.
Why it's wrong here
Config tracks configuration, not network or API calls.
✗
Analyze CloudTrail logs to identify API calls and correlate with VPC Flow Logs for network traffic.
Why it's wrong here
This is the correct approach but the option wording is incomplete; actually, analyzing both is correct but option B is more direct.
✗
Use VPC Flow Logs to identify API calls and network traffic.
Why it's wrong here
Flow Logs do not capture API call details.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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 SCS-C02 NAT questions on configuration and troubleshooting.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable VPC Flow Logs to capture network traffic and use CloudTrail to capture API calls. Correlate both logs for a complete view. — VPC Flow Logs capture network traffic metadata, and CloudTrail captures API calls. Analyzing both together provides a complete picture. Option B is correct because it combines both services. Option A is wrong because CloudTrail alone does not capture network traffic. Option C is wrong because VPC Flow Logs do not capture API calls. Option D is wrong because Config does not log API calls or network traffic.
What should I do if I get this SCS-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 SCS-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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Question Discussion
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