- A
Create a custom Amazon EventBridge rule that catches VPC modification events and automatically re-deploys the CloudFormation stack.
Why wrong: This option is reactive—it only responds after a change occurs, and it does not prevent unauthorized changes. It also requires custom logic to detect all VPC modifications, which is less efficient than StackSets' built-in drift detection.
- B
Use AWS Service Catalog to create a VPC product and require all accounts to provision VPCs through the product.
Why wrong: Service Catalog requires accounts to provision VPCs through the product, but it does not automatically remediate drift or prevent changes made outside the catalog. It also adds manual steps for each new account.
- C
Use AWS Config rules to detect VPC changes and trigger a Lambda function to revert them.
Why wrong: AWS Config rules can detect changes, but triggering a Lambda function to revert them adds complexity and latency. This approach is less integrated than StackSets' drift remediation and does not prevent changes at the source.
- D
Enable drift detection on the StackSet and configure automatic stack drift remediation. Additionally, apply an SCP that denies ec2:CreateVpc, ec2:DeleteVpc, ec2:ModifyVpcAttribute, and similar actions unless they are performed by the StackSet's service role.
This option combines StackSets' automatic drift detection and remediation to correct any drift across all accounts, along with an SCP to deny unauthorized VPC modifications. This ensures consistent configuration and prevents manual changes, making it the most efficient and secure solution.
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 large enterprise has a multi-account AWS environment with over 200 accounts organized under AWS Organizations. The central platform team uses AWS CloudFormation StackSets to deploy a standard VPC with a CIDR of 10.0.0.0/16 into each account. Recently, a business unit created a new account that was not included in the StackSet deployment, and the team manually deployed the VPC using a CloudFormation template. Now, the central team wants to ensure that all accounts have exactly the same VPC configuration and that any drift is automatically corrected. The team also wants to prevent unauthorized changes to the VPC configuration. What is the MOST efficient and secure solution?
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
Enable drift detection on the StackSet and configure automatic stack drift remediation. Additionally, apply an SCP that denies ec2:CreateVpc, ec2:DeleteVpc, ec2:ModifyVpcAttribute, and similar actions unless they are performed by the StackSet's service role.
Option D is the most efficient and secure solution because it uses StackSets drift detection with automatic remediation to continuously detect and correct any deviations from the intended VPC configuration across all accounts. Additionally, applying an SCP that denies VPC-related actions (e.g., ec2:CreateVpc, ec2:DeleteVpc, ec2:ModifyVpcAttribute) unless performed by the StackSet's service role prevents unauthorized changes at the organization level. Option A is reactive and does not prevent drift; Option B requires manual provisioning and does not enforce consistent configuration automatically; Option C requires custom coding (Lambda function) and is less integrated than StackSets' built-in remediation.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 custom Amazon EventBridge rule that catches VPC modification events and automatically re-deploys the CloudFormation stack.
Why it's wrong here
This option is reactive—it only responds after a change occurs, and it does not prevent unauthorized changes. It also requires custom logic to detect all VPC modifications, which is less efficient than StackSets' built-in drift detection.
- ✗
Use AWS Service Catalog to create a VPC product and require all accounts to provision VPCs through the product.
Why it's wrong here
Service Catalog requires accounts to provision VPCs through the product, but it does not automatically remediate drift or prevent changes made outside the catalog. It also adds manual steps for each new account.
- ✗
Use AWS Config rules to detect VPC changes and trigger a Lambda function to revert them.
Why it's wrong here
AWS Config rules can detect changes, but triggering a Lambda function to revert them adds complexity and latency. This approach is less integrated than StackSets' drift remediation and does not prevent changes at the source.
- ✓
Enable drift detection on the StackSet and configure automatic stack drift remediation. Additionally, apply an SCP that denies ec2:CreateVpc, ec2:DeleteVpc, ec2:ModifyVpcAttribute, and similar actions unless they are performed by the StackSet's service role.
Why this is correct
This option combines StackSets' automatic drift detection and remediation to correct any drift across all accounts, along with an SCP to deny unauthorized VPC modifications. This ensures consistent configuration and prevents manual changes, making it the most efficient and secure solution.
Related concept
CIDR notation defines the prefix length.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Visual reference
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
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Design Solutions for Organizational Complexity — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Enable drift detection on the StackSet and configure automatic stack drift remediation. Additionally, apply an SCP that denies ec2:CreateVpc, ec2:DeleteVpc, ec2:ModifyVpcAttribute, and similar actions unless they are performed by the StackSet's service role. — Option D is the most efficient and secure solution because it uses StackSets drift detection with automatic remediation to continuously detect and correct any deviations from the intended VPC configuration across all accounts. Additionally, applying an SCP that denies VPC-related actions (e.g., ec2:CreateVpc, ec2:DeleteVpc, ec2:ModifyVpcAttribute) unless performed by the StackSet's service role prevents unauthorized changes at the organization level. Option A is reactive and does not prevent drift; Option B requires manual provisioning and does not enforce consistent configuration automatically; Option C requires custom coding (Lambda function) and is less integrated than StackSets' built-in remediation.
What should I do if I get this SAP-C02 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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