This DBS-C01 practice question tests your understanding of database security. 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 DynamoDB with a VPC endpoint. They want to restrict access to only requests originating from their VPC. Which policy condition should be used?
'aws:SourceVpce': 'vpce-12345678'
This condition ensures requests come only from the specified VPC endpoint.
'aws:VpcSourceIp': '10.0.0.0/16'
Why wrong: VpcSourceIp is not a condition key.
's3:x-amz-server-side-encryption': 'AES256'
Why wrong: This is S3-specific encryption condition.
'aws:SourceVpc': 'vpc-12345678'
Why wrong: 'aws:SourceVpc' is not a valid condition key for DynamoDB.
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:SourceVpce': 'vpce-12345678'
Option A is correct because the 'aws:SourceVpce' condition key allows you to restrict access to requests originating from a specific VPC endpoint (interface endpoint) in your VPC. This ensures that only traffic coming through that VPC endpoint can access the DynamoDB table, providing a network-level security boundary. The condition must reference the exact VPC endpoint ID (e.g., 'vpce-12345678') to enforce this restriction.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
'aws:SourceVpce': 'vpce-12345678'
Why this is correct
This condition ensures requests come only from the specified VPC endpoint.
Related concept
Read the scenario before looking for a memorised answer.
'aws:VpcSourceIp': '10.0.0.0/16'
Why it's wrong here
VpcSourceIp is not a condition key.
's3:x-amz-server-side-encryption': 'AES256'
Why it's wrong here
This is S3-specific encryption condition.
'aws:SourceVpc': 'vpc-12345678'
Why it's wrong here
'aws:SourceVpc' is not a valid condition key for DynamoDB.
Common exam traps
The trap here is that candidates often confuse 'aws:SourceVpc' (which restricts by VPC ID but is not supported for VPC endpoint policies) with 'aws:SourceVpce' (the correct key for endpoint-level restrictions), leading them to pick Option D instead of A.
Detailed technical explanation
Under the hood, when a DynamoDB VPC endpoint is used, traffic flows through an AWS PrivateLink interface endpoint, which attaches an elastic network interface in your subnet. The 'aws:SourceVpce' condition key checks the source VPC endpoint ID in the request's network metadata, ensuring only traffic that entered through that specific endpoint is allowed. This is critical in multi-VPC or hybrid environments where you want to prevent access from other VPCs or the public internet, even if they have IAM permissions.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Database Security — This question tests Database Security — Read the scenario before looking for a memorised answer..
The correct answer is: 'aws:SourceVpce': 'vpce-12345678' — Option A is correct because the 'aws:SourceVpce' condition key allows you to restrict access to requests originating from a specific VPC endpoint (interface endpoint) in your VPC. This ensures that only traffic coming through that VPC endpoint can access the DynamoDB table, providing a network-level security boundary. The condition must reference the exact VPC endpoint ID (e.g., 'vpce-12345678') to enforce this restriction.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DBS-C01 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 DBS-C01 exam.
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