The answer is to combine ALB access logs stored in S3, the CloudWatch Logs agent on EC2 instances for OS logs, and VPC Flow Logs sent to CloudWatch Logs or S3. This trio works because each service is purpose-built for its specific log type: ALB access logs capture HTTP request details at the load balancer level, the CloudWatch Logs agent streams operating system-level events like syslog or application logs directly from the instances, and VPC Flow Logs record IP traffic metadata for the entire VPC network. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your ability to distinguish between logging layers—a common trap is confusing AWS CloudTrail (which records API calls, not OS logs) with the CloudWatch Logs agent, or mistaking S3 server access logs for network traffic logs. Remember the mnemonic "L-O-N" for Load balancer logs, OS logs via agent, and Network flow logs—each covers a distinct plane of visibility.
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 designing a logging solution for an application that runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The engineer needs to capture and store the following logs for analysis: (1) HTTP request logs from the ALB, (2) operating system logs from the EC2 instances, and (3) network traffic logs for the VPC. Which combination of AWS services should the engineer use? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable access logging on the ALB and store logs in an S3 bucket.
Correct options: A (ALB access logs), B (CloudWatch Logs agent for OS logs), D (VPC Flow Logs). Option C is wrong because CloudTrail does not capture OS logs. Option E is wrong because S3 server access logs are for S3 buckets, not 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 access logging on the ALB and store logs in an S3 bucket.
Static NAT maps one inside address to one outside address.
✓
Enable VPC Flow Logs to capture network traffic metadata.
Why this is correct
VPC Flow Logs capture IP traffic information.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable S3 server access logging for the application's S3 buckets.
Why it's wrong here
S3 server access logs are for S3 buckets, not network traffic.
✗
Enable AWS CloudTrail to capture API calls.
Why it's wrong here
CloudTrail captures API calls, not OS or network logs.
✓
Install the CloudWatch Logs agent on EC2 instances to send OS logs to CloudWatch Logs.
Why this is correct
CloudWatch Logs agent collects OS-level logs.
Related concept
Static NAT maps one inside address to one outside address.
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 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 access logging on the ALB and store logs in an S3 bucket. — Correct options: A (ALB access logs), B (CloudWatch Logs agent for OS logs), D (VPC Flow Logs). Option C is wrong because CloudTrail does not capture OS logs. Option E is wrong because S3 server access logs are for S3 buckets, not 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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