The answer is to use an SCP with a Deny effect for unapproved services. This is correct because AWS Organizations Service Control Policies (SCPs) operate on an implicit deny model, meaning all actions are denied by default unless explicitly allowed; to block unapproved services, you must write a Deny statement listing those services, which overrides any Allow permissions at the account level. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of SCP evaluation logic and the common trap of confusing an Allow list with a Deny list—SCPs do not natively support an “allow only” list, so you must explicitly deny everything not approved. A key memory tip is to remember that SCPs are like a bouncer at a club: they can only kick out unwanted guests (Deny), not pre-approve a VIP list (Allow).
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 uses AWS Organizations with a policy that denies access to services unless they are explicitly allowed. The security team wants to allow only approved services. What type of policy should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an SCP with a Deny effect for unapproved services.
Option D is correct because an SCP with a Deny effect for unapproved services is the standard approach. Option A is wrong because Allow lists are not natively supported by SCPs. Option B is wrong because it's the opposite. Option C is wrong because service control policies are for Organizations.
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 an SCP with an Allow effect for approved services.
Why it's wrong here
SCPs deny by default; Allow does not work as an allow list.
✗
Use an SCP with a Deny effect for all services except approved ones.
Why it's wrong here
This would deny everything, not just unapproved.
✓
Use an SCP with a Deny effect for unapproved services.
Why this is correct
SCPs can deny specific services across accounts.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use an IAM policy with a Deny effect for unapproved services.
Why it's wrong here
IAM policies affect users within an account, not across accounts.
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 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 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 an SCP with a Deny effect for unapproved services. — Option D is correct because an SCP with a Deny effect for unapproved services is the standard approach. Option A is wrong because Allow lists are not natively supported by SCPs. Option B is wrong because it's the opposite. Option C is wrong because service control policies are for Organizations.
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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