The answer is that the user bypassed the IAM deny policy by creating the VPC through AWS CloudFormation with a service role that had full EC2 access. This works because CloudFormation can assume a service role with its own permissions, and when a user launches a stack using that role, the service role’s policies—not the user’s attached IAM policies—govern the resource creation. The user only needs `cloudformation:CreateStack` and `iam:PassRole` for the service role, which the deny policy on VPC actions does not block. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of how service roles can override user-level restrictions, a common trap where candidates assume IAM denies apply universally. Remember: IAM policies restrict the user’s direct API calls, but CloudFormation with a service role acts as a separate identity. Memory tip: “Service roles serve as a backdoor—check what the role can do, not just the user.”
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 has a single AWS account with multiple IAM users. The security team wants to ensure that no IAM user can create or modify VPC resources. The SysOps administrator creates a managed policy that denies ec2:CreateVpc, ec2:DeleteVpc, ec2:ModifyVpcAttribute, and similar actions. The policy is attached to all IAM users via a group. However, after a week, a user reports that they were able to create a VPC. The administrator checks CloudTrail and confirms that the user created the VPC. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The user created the VPC using AWS CloudFormation with a service role that had full EC2 access.
Option D is correct because if the user has a service control policy (SCP) attached to the account that allows VPC creation, the SCP would override the IAM policy if the IAM policy is not properly denying. However, SCPs are for Organizations. Option A is correct because if the user has an inline policy that allows CreateVpc, that would override the deny from the group policy? Actually, an explicit allow would not override a deny; deny always wins. So Option A is wrong. Option B is wrong because the policy was attached to the group. Option C is wrong because the user was using the console. The correct answer is that the user might have an inline policy that explicitly allows the action, but since deny overrides allow, that cannot be the cause. Actually, if the user has an inline policy that allows, the deny from the group policy would still prevent it. So the most likely cause is that the policy was not attached to the user or the policy did not include all necessary actions. However, the question says the policy denies VPC creation. The user could have used a different API call like RunInstances with VPC creation? No. The most plausible is that the user used an AWS service that creates VPCs on behalf of the user, such as AWS CloudFormation or AWS Service Catalog, and the user had permissions to those services. Option D is correct because the user might have used AWS CloudFormation with a role that allows VPC creation.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The user used the AWS Management Console, which does not enforce IAM policies.
Why it's wrong here
The console enforces IAM policies.
✗
The user had an inline policy that allowed ec2:CreateVpc, overriding the group policy.
Why it's wrong here
A deny always overrides an allow.
✗
The policy was attached to the user's group, but the user was not a member of that group.
Why it's wrong here
The question says the policy was attached to all users via a group.
✓
The user created the VPC using AWS CloudFormation with a service role that had full EC2 access.
Why this is correct
If the user had permissions to pass a role, CloudFormation could create resources using that role's permissions.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SOA-C02 ACL questions on filtering logic and placement.
Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The user created the VPC using AWS CloudFormation with a service role that had full EC2 access. — Option D is correct because if the user has a service control policy (SCP) attached to the account that allows VPC creation, the SCP would override the IAM policy if the IAM policy is not properly denying. However, SCPs are for Organizations. Option A is correct because if the user has an inline policy that allows CreateVpc, that would override the deny from the group policy? Actually, an explicit allow would not override a deny; deny always wins. So Option A is wrong. Option B is wrong because the policy was attached to the group. Option C is wrong because the user was using the console. The correct answer is that the user might have an inline policy that explicitly allows the action, but since deny overrides allow, that cannot be the cause. Actually, if the user has an inline policy that allows, the deny from the group policy would still prevent it. So the most likely cause is that the policy was not attached to the user or the policy did not include all necessary actions. However, the question says the policy denies VPC creation. The user could have used a different API call like RunInstances with VPC creation? No. The most plausible is that the user used an AWS service that creates VPCs on behalf of the user, such as AWS CloudFormation or AWS Service Catalog, and the user had permissions to those services. Option D is correct because the user might have used AWS CloudFormation with a role that allows VPC creation.
What should I do if I get this SOA-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SOA-C02 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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