The answer is to use VPC Traffic Mirroring to mirror the instance’s ENI to a monitoring appliance. This service captures and copies all raw network packets—including full headers and payloads—from the Elastic Network Interface without installing any software on the EC2 instance or degrading its performance. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of passive, agentless packet capture methods versus active approaches like installing tcpdump or using VPC Flow Logs, which only provide metadata. A common trap is choosing VPC Flow Logs because they sound similar, but they log only IP traffic metadata, not full packets. Another distractor is using AWS Network Firewall, which inspects traffic but does not provide raw packet copies for offline analysis. Remember: when you need to capture network packets for deep forensic analysis, think “mirror, not logs.” A useful memory tip is “Mirror for the full picture, logs for the summary.”
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.
A security engineer suspects that an EC2 instance is communicating with a known malicious IP address. The engineer needs to capture the full network packets for analysis. Which approach should be taken?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use VPC Traffic Mirroring to mirror the instance's ENI to a monitoring appliance.
VPC Traffic Mirroring captures and copies all network traffic from an EC2 instance's Elastic Network Interface (ENI) and forwards it to a monitoring appliance (e.g., a security appliance or packet analyzer) for full packet-level analysis. This is the only option that provides raw, full network packets (including headers and payloads) without impacting the instance's performance or requiring software installation on the instance itself.
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 AWS Security Hub to detect and capture malicious traffic.
Why it's wrong here
Security Hub aggregates security findings, but does not capture network traffic.
✗
Install the Amazon CloudWatch agent on the instance to capture network logs.
Why it's wrong here
CloudWatch agent collects system metrics, not network packets.
✗
Enable VPC Flow Logs on the subnet and analyze the logs.
Why it's wrong here
Flow Logs capture IP traffic metadata, not full packet contents.
✓
Use VPC Traffic Mirroring to mirror the instance's ENI to a monitoring appliance.
Why this is correct
Traffic Mirroring captures full packets for deep packet inspection.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC Flow Logs (which provide metadata only) with full packet capture, leading them to choose Option C, but VPC Flow Logs cannot capture packet payloads required for deep forensic analysis.
Detailed technical explanation
How to think about this question
VPC Traffic Mirroring uses a mirror filter (e.g., based on source/destination IP, port, or protocol) and a mirror session to copy traffic from a source ENI to a target (e.g., a Network Load Balancer or another ENI). The mirrored traffic is encapsulated using VXLAN (UDP port 4789) to preserve the original packet, allowing tools like tcpdump or Wireshark on the monitoring appliance to reconstruct the full conversation. This is critical for incident response when analyzing malware C2 traffic or exfiltration attempts that require payload inspection.
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: Use VPC Traffic Mirroring to mirror the instance's ENI to a monitoring appliance. — VPC Traffic Mirroring captures and copies all network traffic from an EC2 instance's Elastic Network Interface (ENI) and forwards it to a monitoring appliance (e.g., a security appliance or packet analyzer) for full packet-level analysis. This is the only option that provides raw, full network packets (including headers and payloads) without impacting the instance's performance or requiring software installation on the instance itself.
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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This SCS-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SCS-C02 exam.
Question Discussion
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