The answer is to take a snapshot of the EBS volume and then isolate the instance by modifying the security group. This sequence is critical because the snapshot preserves the volatile root cause evidence—such as malware or configuration files—before the security group change cuts off network access to the command and control server. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of the forensic preservation principle: evidence must be captured before containment. A common trap is choosing to terminate the instance immediately, which destroys the EBS volume and all forensic data, or relying on a CloudWatch agent that may not be installed or configured to capture historical logs. Remember the memory tip: “Snap first, block second” to ensure you never lose the evidence while stopping the threat.
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 company uses Amazon GuardDuty in a single AWS account to detect threats. The security team receives an alert that a specific EC2 instance is communicating with a known command and control (C2) server. The security engineer needs to immediately isolate the instance while preserving the root cause evidence. The engineer has access to the AWS Management Console. Which action should the engineer take FIRST?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Take a snapshot of the EBS volume and then isolate the instance by modifying the security group.
Option D is correct. Taking a snapshot of the EBS volume preserves evidence before isolation. Option A is wrong because terminating the instance loses evidence. Option B is wrong because changing the security group may stop communication but evidence is not preserved. Option C is wrong because CloudWatch Logs agent is not installed and may not capture historical data.
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.
✗
Terminate the instance immediately to stop the communication.
Why it's wrong here
Termination loses evidence.
✓
Take a snapshot of the EBS volume and then isolate the instance by modifying the security group.
Why this is correct
Snapshot preserves evidence, then isolation stops communication.
Clue confirmation
The clue words "first", "immediately / without restart" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Modify the security group to block all outbound traffic.
Why it's wrong here
This stops communication but does not preserve evidence.
✗
Install the CloudWatch Logs agent on the instance to capture logs.
Why it's wrong here
This does not isolate and may not capture past activity.
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 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.
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: Take a snapshot of the EBS volume and then isolate the instance by modifying the security group. — Option D is correct. Taking a snapshot of the EBS volume preserves evidence before isolation. Option A is wrong because terminating the instance loses evidence. Option B is wrong because changing the security group may stop communication but evidence is not preserved. Option C is wrong because CloudWatch Logs agent is not installed and may not capture historical data.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first", "immediately / without restart". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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