The answer is that the SCP does not apply to the management account where the test was performed. Service Control Policies act as a guardrail for member accounts within AWS Organizations, but they explicitly have no effect on the management account itself, which retains full administrative access regardless of any attached SCPs. This scenario tests your understanding of the AWS Organizations hierarchy and a common exam trap: assuming SCPs govern all accounts equally. On the AWS Certified Security Specialty SCS-C02 exam, this concept frequently appears in questions where a security control seems to fail, and the root cause is that the action was taken in the management account rather than a member account. Remember that the management account is the "root of all evil" in terms of bypassing SCPs—if you need to enforce a policy universally, you must apply it to member accounts and restrict management account access through IAM alone. A simple memory tip: "SCPs stop members, not the master."
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 multinational corporation uses AWS Organizations to manage multiple accounts. The security team requires that all data in S3 buckets across all accounts be encrypted at rest using customer-managed KMS keys. They have created a Service Control Policy (SCP) to deny creation of S3 buckets without encryption. However, upon testing, they find that a user in a member account can still create an unencrypted bucket. The SCP is attached to the root organizational unit. The SCP statement is: {"Effect":"Deny","Action":"s3:CreateBucket","Resource":"*","Condition":{"Null":{"s3:x-amz-server-side-encryption":"true"}}}. What is the MOST likely reason the SCP is not working?
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 SCP does not apply to the management account where the test was performed.
Option A is correct because SCPs do not affect the management account; they only apply to member accounts. Option B is wrong because SCPs are not evaluated before IAM policies; they are evaluated after but still effective. Option C is wrong because the SCP uses the correct condition key. Option D is wrong because SCPs do not need to be explicitly enabled by the member account; they are effective automatically when attached.
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.
✗
The SCP requires the member account to enable SCP enforcement.
Why it's wrong here
SCPs are automatically enforced when attached; no action is needed from the member account.
✗
The condition key s3:x-amz-server-side-encryption is incorrect; the correct key is s3:x-amz-server-side-encryption-aws-kms-key-id.
Why it's wrong here
The condition key used is correct for checking if the header is present.
✗
The SCP is not effective because IAM policies are evaluated before SCPs.
Why it's wrong here
SCPs are evaluated after IAM policies but still take effect; the order does not prevent enforcement.
✓
The SCP does not apply to the management account where the test was performed.
Why this is correct
SCPs do not apply to the management account; they only apply to member accounts.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 SCS-C02 NAT questions on configuration and troubleshooting.
Data Protection — This question tests Data Protection — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The SCP does not apply to the management account where the test was performed. — Option A is correct because SCPs do not affect the management account; they only apply to member accounts. Option B is wrong because SCPs are not evaluated before IAM policies; they are evaluated after but still effective. Option C is wrong because the SCP uses the correct condition key. Option D is wrong because SCPs do not need to be explicitly enabled by the member account; they are effective automatically when attached.
What should I do if I get this SCS-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 SCS-C02 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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