- A
Attach an S3 bucket policy that denies access unless the source IP is the public IP address of the Direct Connect VIF.
Why wrong: Direct Connect VIFs use private IP addresses, not public IPs; the source IP would be from the on-premises network, not the VIF.
- B
Create a VPC endpoint for S3 with a VPC endpoint policy that allows access only from the VPC, and configure the VPC route table to route S3 traffic through the Direct Connect VIF.
This ensures that S3 traffic must traverse the VPC endpoint, and the route table forces traffic through the Direct Connect VIF, restricting access to that path.
- C
Create a network ACL that allows S3 traffic only from the Direct Connect CIDR block and associate it with the VPC subnet connected to the VIF.
Why wrong: Network ACLs are stateless and not designed to enforce traffic source path; they also do not directly restrict S3 bucket access.
- D
Configure the Direct Connect VIF with a public IP address and use an S3 bucket policy that allows access only from that IP address.
Why wrong: Direct Connect VIFs do not have public IP addresses; they use private IPs or BGP prefixes.
Quick Answer
The correct answer is to create a VPC endpoint for S3 with a VPC endpoint policy that allows access only from the VPC, and configure the VPC route table to route S3 traffic through the Direct Connect VIF. This works because the VPC endpoint policy acts as a gatekeeper, explicitly restricting access to traffic originating from within the VPC, while the route table forces all S3-bound traffic to traverse the Direct Connect VIF, ensuring the traffic path is locked to that specific connection. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how to combine VPC endpoints with routing policies to enforce network-level segmentation, a common trap being the mistaken use of bucket policies with IP conditions, which cannot guarantee the traffic path. Remember the key: a VPC endpoint policy controls *who* can access S3 from the VPC, while the route table controls *how* that traffic gets there—think of it as a two-key lock for network path enforcement.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 wants to restrict access to an Amazon S3 bucket so that only traffic from a specific AWS Direct Connect virtual interface (VIF) can access it. Which combination of steps should the company take?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create a VPC endpoint for S3 with a VPC endpoint policy that allows access only from the VPC, and configure the VPC route table to route S3 traffic through the Direct Connect VIF.
Option C is correct because using a VPC endpoint with a VPC endpoint policy and a VPC route table that routes traffic through the Direct Connect VIF ensures that only traffic from that VIF can access the S3 bucket. Option A is wrong because network ACLs are stateless and not appropriate for this use case. Option B is wrong because a bucket policy with an IP address condition does not enforce the path through the Direct Connect VIF. Option D is wrong because Direct Connect does not assign public IP addresses to VIFs.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Attach an S3 bucket policy that denies access unless the source IP is the public IP address of the Direct Connect VIF.
Why it's wrong here
Direct Connect VIFs use private IP addresses, not public IPs; the source IP would be from the on-premises network, not the VIF.
- ✓
Create a VPC endpoint for S3 with a VPC endpoint policy that allows access only from the VPC, and configure the VPC route table to route S3 traffic through the Direct Connect VIF.
Why this is correct
This ensures that S3 traffic must traverse the VPC endpoint, and the route table forces traffic through the Direct Connect VIF, restricting access to that path.
Related concept
CIDR notation defines the prefix length.
- ✗
Create a network ACL that allows S3 traffic only from the Direct Connect CIDR block and associate it with the VPC subnet connected to the VIF.
Why it's wrong here
Network ACLs are stateless and not designed to enforce traffic source path; they also do not directly restrict S3 bucket access.
- ✗
Configure the Direct Connect VIF with a public IP address and use an S3 bucket policy that allows access only from that IP address.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
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
How to think about this question
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.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Create a VPC endpoint for S3 with a VPC endpoint policy that allows access only from the VPC, and configure the VPC route table to route S3 traffic through the Direct Connect VIF. — Option C is correct because using a VPC endpoint with a VPC endpoint policy and a VPC route table that routes traffic through the Direct Connect VIF ensures that only traffic from that VIF can access the S3 bucket. Option A is wrong because network ACLs are stateless and not appropriate for this use case. Option B is wrong because a bucket policy with an IP address condition does not enforce the path through the Direct Connect VIF. Option D is wrong because Direct Connect does not assign public IP addresses to VIFs.
What should I do if I get this ANS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
This ANS-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 ANS-C01 exam.
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