The correct answer is that the accounts launching instances without tags are the management account, because SCPs do not affect the management account. This is a fundamental design principle of AWS Organizations: the management account is exempt from all SCPs, meaning any policy—whether an allow or a deny—simply does not apply to it. In this scenario, the security team’s SCP denying ec2:RunInstances without the CostCenter tag would be ignored for the management account, allowing it to launch untagged instances freely. On the AWS Certified Security Specialty SCS-C02 exam, this concept tests your understanding of SCP boundaries and is a common trap where candidates assume SCPs apply uniformly across all accounts. A key memory tip is to remember that the management account is the “root of the tree”—it cannot be pruned by SCPs, so always check if the affected account is the payer or management account first.
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 has a multi-account AWS environment managed with AWS Organizations. The security team wants to ensure that no EC2 instance in any account can be launched without a specific tag 'CostCenter'. The team has created a Service Control Policy (SCP) that denies the ec2:RunInstances action if the request does not include the tag 'CostCenter'. However, they find that instances are still being launched without the tag in some accounts. What is the most likely reason?
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 accounts launching instances without tags are the management account.
Option C is correct because SCPs do not affect the management account; the management account is exempt from SCPs. Option A is wrong because IAM policies are account-specific; the SCP should still apply if attached. Option B is wrong because SCPs do not require explicit allow for all actions; they work by deny. Option D is wrong because the condition key for tags is 'aws:RequestTag', not 'aws:ResourceTag'.
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 SCP uses the wrong condition key; it should use 'aws:ResourceTag' instead.
Why it's wrong here
The correct condition key for tagging during creation is 'aws:RequestTag'.
✓
The accounts launching instances without tags are the management account.
Why this is correct
The management account is not affected by SCPs.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The SCP does not include an explicit allow for the action.
Why it's wrong here
SCPs are deny list; they do not require allow.
✗
The SCP is not attached to the organizational units containing the accounts.
Why it's wrong here
If it were attached, it would apply to all accounts except management.
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 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 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 SCS-C02 ACL questions on filtering logic and placement.
Management and Security Governance — This question tests Management and Security Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The accounts launching instances without tags are the management account. — Option C is correct because SCPs do not affect the management account; the management account is exempt from SCPs. Option A is wrong because IAM policies are account-specific; the SCP should still apply if attached. Option B is wrong because SCPs do not require explicit allow for all actions; they work by deny. Option D is wrong because the condition key for tags is 'aws:RequestTag', not 'aws:ResourceTag'.
What should I do if I get this SCS-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 SCS-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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