SCS-C02 Identity and Access Management Practice Question
This SCS-C02 practice question tests your understanding of identity and access management. 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 an S3 bucket that stores sensitive data. The security team requires that all access to the bucket be logged in AWS CloudTrail and that all requests must be authenticated using IAM credentials. Which S3 bucket policy statement should be added to enforce these requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
"Deny" effect with "Null" condition on "aws:PrincipalArn"
Option C is correct because the condition 'aws:SourceIp' is not relevant for enforcing IAM credentials; the correct condition is 'aws:SecureTransport' for requiring HTTPS, but the question is about requiring IAM credentials. However, the correct answer is to deny access when the principal is not an IAM user/role. Option A denies access from specific IPs, B denies anonymous access, and D uses the wrong condition key for IAM credentials. The correct policy should deny when 'aws:userid' is not present, but none of the options exactly match. Since the question asks for a policy to enforce IAM credentials, the correct answer is to deny anonymous access. So Option B is correct. Explanation: Option B denies access when the principal is anonymous, ensuring only IAM-authenticated requests succeed. Option A only blocks IPs, not unauthenticated access. Option C uses 'aws:SourceIp' which doesn't check authentication. Option D uses 'aws:Referer' which is not for authentication.
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.
✗
"Deny" effect with "StringNotEquals" on "aws:SourceIdentity"
Why it's wrong here
SourceIdentity is not a standard condition for authentication.
✗
"Deny" effect with "aws:SourceIp" condition
Why it's wrong here
This restricts by IP but does not require IAM credentials.
✓
"Deny" effect with "Null" condition on "aws:PrincipalArn"
Why this is correct
Denies access when the principal ARN is null (anonymous requests).
Related concept
Static NAT maps one inside address to one outside address.
✗
"Allow" effect with "Referer" condition
Why it's wrong here
Referer can be spoofed and does not enforce IAM credentials.
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.
Identity and Access Management — This question tests Identity and Access Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: "Deny" effect with "Null" condition on "aws:PrincipalArn" — Option C is correct because the condition 'aws:SourceIp' is not relevant for enforcing IAM credentials; the correct condition is 'aws:SecureTransport' for requiring HTTPS, but the question is about requiring IAM credentials. However, the correct answer is to deny access when the principal is not an IAM user/role. Option A denies access from specific IPs, B denies anonymous access, and D uses the wrong condition key for IAM credentials. The correct policy should deny when 'aws:userid' is not present, but none of the options exactly match. Since the question asks for a policy to enforce IAM credentials, the correct answer is to deny anonymous access. So Option B is correct. Explanation: Option B denies access when the principal is anonymous, ensuring only IAM-authenticated requests succeed. Option A only blocks IPs, not unauthenticated access. Option C uses 'aws:SourceIp' which doesn't check authentication. Option D uses 'aws:Referer' which is not for authentication.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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