The correct answer is to modify the S3 bucket policy. This policy type is the right choice because it allows you to enforce access control at the resource level using the `aws:SourceIp` condition key, which can explicitly deny or allow traffic based on the requester’s IP address. By attaching a bucket policy that restricts access to only the corporate IP range 203.0.113.0/24, you ensure that requests from any IAM user or role outside that network are blocked, regardless of their individual permissions. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of resource-based policies versus identity-based policies—a common trap is to think you need to modify an IAM policy, but IAM policies cannot filter by source IP for S3. A quick memory tip: think “bucket policy for IP block” because the bucket itself holds the key to network-level restrictions.
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. 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's security policy requires that only traffic from the corporate office IP range (203.0.113.0/24) can access an Amazon S3 bucket that stores internal reports. The SysOps administrator must enforce this restriction. Which policy type should be modified to implement this requirement?
Why wrong: IAM policies control permissions for IAM users/roles, but they cannot enforce network-level restrictions like source IP.
B
VPC endpoint policy
Why wrong: VPC endpoint policies control access from a specific VPC endpoint, not from arbitrary IP ranges.
C
S3 bucket policy
S3 bucket policies can use a condition with aws:SourceIp to allow access only from specified IP ranges.
D
AWS Organizations SCP
Why wrong: Service control policies apply to all accounts in an organizational unit, not to a specific bucket, and cannot enforce IP restrictions at the bucket level.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
S3 bucket policy
An S3 bucket policy is the correct choice because it allows you to explicitly deny or allow access to the S3 bucket based on the source IP address using the `aws:SourceIp` condition key. This policy is attached directly to the bucket and can restrict access to only the corporate office IP range (203.0.113.0/24), regardless of the IAM user or role making the request. It enforces the security requirement at the resource level, which is the most direct and effective method for controlling network-based access to an S3 bucket.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
IAM identity-based policy
Why it's wrong here
IAM policies control permissions for IAM users/roles, but they cannot enforce network-level restrictions like source IP.
✗
VPC endpoint policy
Why it's wrong here
VPC endpoint policies control access from a specific VPC endpoint, not from arbitrary IP ranges.
✓
S3 bucket policy
Why this is correct
S3 bucket policies can use a condition with aws:SourceIp to allow access only from specified IP ranges.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS Organizations SCP
Why it's wrong here
Service control policies apply to all accounts in an organizational unit, not to a specific bucket, and cannot enforce IP restrictions at the bucket level.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse IAM identity-based policies with resource-based policies, mistakenly thinking they can use IAM policies to restrict by source IP, when in fact only S3 bucket policies (or similar resource-based policies) support the `aws:SourceIp` condition for network-level access control.
Detailed technical explanation
How to think about this question
Under the hood, S3 bucket policies are evaluated as resource-based policies that grant or deny access to the bucket and its objects. The `aws:SourceIp` condition key works with the `Deny` effect to block all traffic except from the specified IP range, and it is important to note that this condition key only works when the request comes from a public IP address; if traffic goes through a VPC endpoint, the source IP is replaced by the endpoint's private IP, so a bucket policy with `aws:SourceIp` would not work in that scenario. In a real-world scenario, if the corporate office uses a NATgateway with a static public IP, this policy is effective, but if the office uses a VPN or Direct Connect, you might need to combine it with a VPC endpoint policy or use `aws:VpcSourceIp` for private IP ranges.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: S3 bucket policy — An S3 bucket policy is the correct choice because it allows you to explicitly deny or allow access to the S3 bucket based on the source IP address using the `aws:SourceIp` condition key. This policy is attached directly to the bucket and can restrict access to only the corporate office IP range (203.0.113.0/24), regardless of the IAM user or role making the request. It enforces the security requirement at the resource level, which is the most direct and effective method for controlling network-based access to an S3 bucket.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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