Quick Answer
The answer is to include the aws:SourceVpce, aws:SourceVpc, and aws:PrincipalArn condition keys in the KMS key policy. These three conditions work together to enforce that only the specified IAM role can use the key, and only when the request originates from the designated VPC or its VPC endpoint. The aws:SourceVpce condition restricts usage to requests routed through a specific VPC endpoint, while aws:SourceVpc ensures the request comes from the VPC’s private IP range, and aws:PrincipalArn locks the permission to the exact role. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of KMS key policy condition keys versus IAM policy conditions—a common trap is confusing source IP with VPC-based restrictions, but KMS does not support aws:SourceIp for VPC isolation. Memory tip: think “VPC triple lock”—role, VPC, and endpoint—to avoid subnet or IP pitfalls.
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 is using AWS KMS to encrypt data. The security team wants to ensure that a specific IAM role can use a KMS key, but only when the request comes from a specific VPC. Which THREE conditions should be included in the KMS key policy? (Choose three.)
aws:SourceSubnet equals the subnet ID.
Why wrong: Not a valid condition key.
aws:SourceArn equals the IAM role ARN.
Identifies the role.
aws:SourceVpc equals the VPC ID.
Restricts to VPC.
aws:SourceIp equals the VPC CIDR.
Why wrong: Not recommended for VPC.
aws:SourceVpce equals the VPC endpoint ID.
Restricts to VPC endpoint.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
aws:SourceArn equals the IAM role ARN.
Option A is correct to specify the role. Option B is correct to restrict to the VPC endpoint. Option D is correct to restrict to the VPC. Option C is wrong because source IP is not specific to VPC. Option E is wrong because subnet ID is not a condition key for KMS.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
aws:SourceSubnet equals the subnet ID.
Why it's wrong here
Not a valid condition key.
aws:SourceArn equals the IAM role ARN.
Why this is correct
Identifies the role.
Related concept
CIDR notation defines the prefix length.
aws:SourceVpc equals the VPC ID.
Why this is correct
Restricts to VPC.
Related concept
CIDR notation defines the prefix length.
aws:SourceIp equals the VPC CIDR.
Why it's wrong here
Not recommended for VPC.
aws:SourceVpce equals the VPC endpoint ID.
Why this is correct
Restricts to VPC endpoint.
Related concept
CIDR notation defines the prefix length.
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
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
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Security and Compliance — study guide chapter
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FAQ
Security and Compliance — This question tests Security and Compliance — CIDR notation defines the prefix length..
The correct answer is: aws:SourceArn equals the IAM role ARN. — Option A is correct to specify the role. Option B is correct to restrict to the VPC endpoint. Option D is correct to restrict to the VPC. Option C is wrong because source IP is not specific to VPC. Option E is wrong because subnet ID is not a condition key for KMS.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
This SOA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SOA-C02 exam.
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