The answer is to create a service control policy (SCP) that denies the creation of resources if they do not have the required tags. This is the most effective solution because SCPs operate as a preventive guardrail at the AWS Organizations root or OU level, centrally enforcing tag compliance across all member accounts before any resource is provisioned. For the AWS Certified Solutions Architect Professional SAP-C02 exam, this question tests your understanding of the critical distinction between preventive controls (SCPs) and detective controls (AWS Config rules). A common trap is choosing AWS Config, which can only detect and remediate non-compliant resources after creation, not block them. To remember: SCPs are the bouncer at the door—they deny entry to untagged resources—while Config is the security camera that spots the problem later. For enforcing cost allocation tags across multi-account environments, always lead with SCPs for proactive enforcement.
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. 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 is using AWS Organizations with a multi-account strategy. The finance team wants to centrally manage and enforce cost allocation tags across all accounts. Which solution is MOST effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a service control policy (SCP) that denies the creation of resources if they do not have the required tags.
Option B is correct because a service control policy can enforce that resources are created with required tags by denying creation if tags are missing. Option A is wrong because tagging resources manually is error-prone. Option C is wrong because AWS Config rules are detective, not preventive. Option D is wrong because AWS Budgets does not enforce tags.
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.
✓
Create a service control policy (SCP) that denies the creation of resources if they do not have the required tags.
Why this is correct
SCPs can enforce tag requirements proactively.
Related concept
Standard ACLs match source addresses.
✗
Use AWS Budgets to alert on untagged resources.
Why it's wrong here
Budgets do not enforce tags.
✗
Use AWS Config rules to detect untagged resources and trigger a Lambda function to tag them.
Why it's wrong here
Detective, not preventive.
✗
Create an AWS Lambda function that tags resources after they are created.
Why it's wrong here
Reactive, not preventive.
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 SAP-C02 ACL questions on filtering logic and placement.
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create a service control policy (SCP) that denies the creation of resources if they do not have the required tags. — Option B is correct because a service control policy can enforce that resources are created with required tags by denying creation if tags are missing. Option A is wrong because tagging resources manually is error-prone. Option C is wrong because AWS Config rules are detective, not preventive. Option D is wrong because AWS Budgets does not enforce tags.
What should I do if I get this SAP-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 SAP-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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