The answer is to enable VPC Flow Logs for the subnet and analyze the logs. This is correct because VPC Flow Logs capture network traffic metadata—including source and destination IP addresses, ports, protocols, and packet sizes—for all traffic to and from the EC2 instance at the subnet level, providing a complete forensic record without any disruption to the running instance or its Auto Scaling group. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your understanding of preserving evidence during incident response while avoiding actions that alter the environment, such as stopping or terminating the instance, which would destroy volatile data and trigger Auto Scaling replacements. A common trap is choosing to attach a network interface or install packet-capture agents, which modify the instance state or risk losing logs if the instance is recycled. Remember the mnemonic: “Flow, don’t blow” — VPC Flow Logs capture metadata without blowing up the forensic scene.
SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. 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.
During incident response, a security engineer needs to capture network traffic from an EC2 instance for forensic analysis. The instance is part of an Auto Scaling group. Which action preserves the most evidence while minimizing disruption?
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 for the subnet and analyze the logs.
Option A is correct because VPC Flow Logs capture metadata (IP addresses, ports, protocols, packet sizes) of all traffic to/from the EC2 instance at the subnet level, preserving a forensic record without any disruption to the running instance or Auto Scaling group. This approach avoids stopping, terminating, or modifying the instance, ensuring the incident environment remains intact for further investigation.
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.
✓
Enable VPC Flow Logs for the subnet and analyze the logs.
Why this is correct
Flow logs capture network metadata without performance impact.
Related concept
Read the scenario before looking for a memorised answer.
✗
Take an EBS snapshot and analyze network logs from the snapshot.
Why it's wrong here
Snapshots do not capture live network traffic.
✗
Use AWS Traffic Mirroring to mirror traffic to a monitoring appliance.
Why it's wrong here
Traffic Mirroring captures full packets but may degrade performance.
✗
Terminate the instance and launch a new one to capture network logs.
Why it's wrong here
Termination destroys evidence.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'capturing network traffic' with needing packet-level inspection (e.g., Traffic Mirroring) and overlook that VPC Flow Logs provide sufficient forensic metadata for most incident response scenarios without disrupting the instance.
Detailed technical explanation
How to think about this question
VPC Flow Logs capture network metadata at the subnet, VPC, or ENI level using the AWS VPC Flow Logs service, which records fields like srcaddr, dstaddr, srcport, dstport, protocol, packets, and bytes in 10-minute aggregation windows (or 1-minute with enhanced visibility). Under the hood, flow logs are published to Amazon CloudWatch Logs or S3, and they do not capture packet payloads, only Layer 3/4 headers, making them ideal for non-intrusive forensic analysis of connection patterns. In a real-world incident, this allows analysts to identify malicious IPs, port scanning, or data exfiltration attempts without alerting the attacker or disrupting the Auto Scaling group's health checks.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — 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 for the subnet and analyze the logs. — Option A is correct because VPC Flow Logs capture metadata (IP addresses, ports, protocols, packet sizes) of all traffic to/from the EC2 instance at the subnet level, preserving a forensic record without any disruption to the running instance or Auto Scaling group. This approach avoids stopping, terminating, or modifying the instance, ensuring the incident environment remains intact for further investigation.
What should I do if I get this SCS-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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