The correct answer is a combination of a service control policy (SCP) to deny ec2:RunInstances for non-approved instance types and AWS CloudFormation hooks to enforce the same restriction at the infrastructure-as-code level. This works because SCPs act as a preventive guardrail at the AWS Organizations level, blocking any API call that attempts to launch an unapproved instance family across all accounts, while CloudFormation hooks provide a second layer of enforcement by validating instance types during stack creation or update, preventing drift even when deployments are automated. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your ability to distinguish between detective, reactive, and preventive controls—a common trap is choosing AWS Config (detective) or a Lambda-triggered remediation (reactive), which only alert or fix violations after they occur, rather than blocking them upfront. Memory tip: think “SCP stops the call, Hook halts the stack”—both are preventive, not just reporting.
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 has a multi-account environment with over 500 accounts. They need to enforce that all EC2 instances are launched only in approved instance families (e.g., t3, m5, c5). Which combination of AWS services provides the MOST scalable and effective enforcement?
Use a service control policy (SCP) to deny ec2:RunInstances if the instance type is not in the approved list, and use AWS CloudFormation hooks to enforce the same.
Preventive at the API level and works for CloudFormation deployments.
B
Use AWS CloudTrail to trigger an AWS Lambda function that terminates non-compliant instances.
Why wrong: Reactive and has latency.
C
Use AWS Systems Manager to scan instances and apply a tag for non-compliance.
Why wrong: Does not prevent launch.
D
Use AWS Config rules to detect non-compliant instances and automatically terminate them.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a service control policy (SCP) to deny ec2:RunInstances if the instance type is not in the approved list, and use AWS CloudFormation hooks to enforce the same.
Option D is correct because SCPs deny non-compliant API calls, and CloudFormation hooks prevent non-compliant stacks. Option A is wrong because Config is detective, not preventive. Option B is wrong because Lambda triggered by CloudTrail is reactive. Option C is wrong because Systems Manager is not for enforcement at launch time.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Use a service control policy (SCP) to deny ec2:RunInstances if the instance type is not in the approved list, and use AWS CloudFormation hooks to enforce the same.
Why this is correct
Preventive at the API level and works for CloudFormation deployments.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use AWS CloudTrail to trigger an AWS Lambda function that terminates non-compliant instances.
Why it's wrong here
Reactive and has latency.
✗
Use AWS Systems Manager to scan instances and apply a tag for non-compliance.
Why it's wrong here
Does not prevent launch.
✗
Use AWS Config rules to detect non-compliant instances and automatically terminate them.
Why it's wrong here
Reactive and may cause disruption.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a service control policy (SCP) to deny ec2:RunInstances if the instance type is not in the approved list, and use AWS CloudFormation hooks to enforce the same. — Option D is correct because SCPs deny non-compliant API calls, and CloudFormation hooks prevent non-compliant stacks. Option A is wrong because Config is detective, not preventive. Option B is wrong because Lambda triggered by CloudTrail is reactive. Option C is wrong because Systems Manager is not for enforcement at launch time.
What should I do if I get this SAP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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