The correct answer is to apply an inline policy to the IAM role that denies all S3 actions. This immediately stops data exfiltration from the compromised EC2 instance because the deny effect overrides any allow permissions, cutting off S3 access at the role level without terminating the instance or destroying volatile evidence. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of IAM policy evaluation logic and the principle of least privilege in incident response—a common trap is choosing to terminate the instance, which destroys forensic data, or modifying the bucket policy, which is slower and may not propagate instantly. Remember that an inline deny policy on the role is the fastest, most surgical way to halt exfiltration while preserving the instance for investigation. Memory tip: “Deny first, investigate later—never terminate the evidence.”
SCS-C02 Management and Security Governance Practice Question
This SCS-C02 practice question tests your understanding of management and security governance. 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's security team discovers that an EC2 instance in the production account has been compromised. The instance has an IAM role attached that allows it to read from an S3 bucket containing sensitive data. The team needs to immediately stop the data exfiltration while preserving the evidence. What should the team do 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
✓
Apply an inline policy to the IAM role that denies all S3 actions.
Option C is correct because applying a deny-all policy to the role's S3 access will immediately stop the exfiltration without terminating the instance, preserving evidence. Option A is wrong because terminating the instance may destroy evidence. Option B is wrong because modifying the bucket policy takes time and may not be immediate. Option D is wrong because removing the role may cause issues and does not immediately stop the exfiltration if the role is cached.
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.
✗
Detach the S3 bucket from the VPC endpoint.
Why it's wrong here
This may not be immediate and could affect other resources.
✓
Apply an inline policy to the IAM role that denies all S3 actions.
Why this is correct
This immediately stops the role's ability to access S3.
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.
✗
Remove the IAM role from the EC2 instance.
Why it's wrong here
Removing the role may not take effect immediately if credentials are cached.
✗
Terminate the compromised EC2 instance immediately.
Why it's wrong here
Terminating destroys forensic evidence.
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.
Management and Security Governance — This question tests Management and Security Governance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Apply an inline policy to the IAM role that denies all S3 actions. — Option C is correct because applying a deny-all policy to the role's S3 access will immediately stop the exfiltration without terminating the instance, preserving evidence. Option A is wrong because terminating the instance may destroy evidence. Option B is wrong because modifying the bucket policy takes time and may not be immediate. Option D is wrong because removing the role may cause issues and does not immediately stop the exfiltration if the role is cached.
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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