- A
Create a Systems Manager Automation service role with a least-privilege policy that includes ec2:ModifySecurityGroupRules and use that role in the automation.
This is the recommended approach for least privilege.
- B
Create an AWS Lambda function with permissions to modify the security group and call it from the automation.
Why wrong: Lambda execution role is not needed when running an automation document directly.
- C
Use the IAM user's permissions that trigger the automation.
Why wrong: Using the caller's permissions is less secure and may grant excessive permissions.
- D
Attach an IAM policy to the EC2 instance's instance profile that allows ec2:ModifySecurityGroupRules.
Why wrong: Attaching a policy to the instance profile grants the EC2 instance broad permissions that could be misused.
Quick Answer
The correct answer is to create a Systems Manager Automation service role with a least-privilege policy that includes ec2:ModifySecurityGroupRules and use that role in the automation. This is the most secure approach because it follows the principle of least privilege for EC2 isolation, granting only the specific permission needed to modify security group rules rather than broader actions like ec2:RevokeSecurityGroupIngress or full ec2:* access. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how Systems Manager Automation assumes a dedicated IAM role to perform incident response tasks without relying on user credentials or instance profiles, which could be compromised. A common trap is choosing a role with ec2:RevokeSecurityGroupIngress, but that action is for classic security groups, not EC2 security groups, where ModifySecurityGroupRules is the precise permission for rule-level changes. Memory tip: think "Modify for modern" — when isolating a compromised instance by editing security group rules, always reach for ec2:ModifySecurityGroupRules.
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 is designing an automated incident response workflow for an Amazon EC2 instance that is compromised. The workflow must isolate the instance by removing it from the security group that allows SSH access. The engineer wants to use AWS Systems Manager Automation to run a document. What is the most secure way to grant the automation the necessary permissions to modify the security group?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create a Systems Manager Automation service role with a least-privilege policy that includes ec2:ModifySecurityGroupRules and use that role in the automation.
Option A is correct because Systems Manager Automation can assume a dedicated service role with a least-privilege IAM policy that includes the specific action `ec2:ModifySecurityGroupRules`. This follows the security best practice of granting only the permissions required for the automation to modify the security group, without exposing broader privileges or relying on user or instance credentials.
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.
- ✓
Create a Systems Manager Automation service role with a least-privilege policy that includes ec2:ModifySecurityGroupRules and use that role in the automation.
Why this is correct
This is the recommended approach for least privilege.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create an AWS Lambda function with permissions to modify the security group and call it from the automation.
Why it's wrong here
Lambda execution role is not needed when running an automation document directly.
- ✗
Use the IAM user's permissions that trigger the automation.
Why it's wrong here
Using the caller's permissions is less secure and may grant excessive permissions.
- ✗
Attach an IAM policy to the EC2 instance's instance profile that allows ec2:ModifySecurityGroupRules.
Why it's wrong here
Attaching a policy to the instance profile grants the EC2 instance broad permissions that could be misused.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the instance profile role (used for the EC2 instance's own actions) with the automation service role (used for the Systems Manager service to perform actions on behalf of the engineer), leading them to incorrectly choose Option D.
Detailed technical explanation
How to think about this question
Systems Manager Automation uses the `assumeRole` parameter in the `aws:executeScript` or `aws:executeAwsApi` action to assume a service role for API calls. The role's trust policy must allow the Systems Manager service (`ssm.amazonaws.com`) to assume it, and the permissions policy should be scoped to the specific security group using a resource ARN condition. This ensures that even if the automation document is misused, it can only modify the intended security group, not all groups in the account.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 — study guide chapter
Learn the concepts, then practise the questions
- →
Threat Detection and Incident Response practice questions
Targeted practice on this topic area only
- →
All SCS-C02 questions
1,738 questions across all exam domains
- →
AWS Certified Security Specialty SCS-C02 study guide
Full concept coverage aligned to exam objectives
- →
SCS-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related SCS-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Threat Detection and Incident Response practice questions
Practise SCS-C02 questions linked to Threat Detection and Incident Response.
Security Logging and Monitoring practice questions
Practise SCS-C02 questions linked to Security Logging and Monitoring.
Identity and Access Management practice questions
Practise SCS-C02 questions linked to Identity and Access Management.
Management and Security Governance practice questions
Practise SCS-C02 questions linked to Management and Security Governance.
Infrastructure Security practice questions
Practise SCS-C02 questions linked to Infrastructure Security.
Data Protection practice questions
Practise SCS-C02 questions linked to Data Protection.
SCS-C02 fundamentals practice questions
Practise SCS-C02 questions linked to SCS-C02 fundamentals.
SCS-C02 scenario practice questions
Practise SCS-C02 questions linked to SCS-C02 scenario.
SCS-C02 troubleshooting practice questions
Practise SCS-C02 questions linked to SCS-C02 troubleshooting.
Practice this exam
Start a free SCS-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this SCS-C02 question test?
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: Create a Systems Manager Automation service role with a least-privilege policy that includes ec2:ModifySecurityGroupRules and use that role in the automation. — Option A is correct because Systems Manager Automation can assume a dedicated service role with a least-privilege IAM policy that includes the specific action `ec2:ModifySecurityGroupRules`. This follows the security best practice of granting only the permissions required for the automation to modify the security group, without exposing broader privileges or relying on user or instance credentials.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.