- A
Use a NAT gateway in the VPC
Why wrong: NAT gateway enables outbound internet for private subnets, not inbound access from on-premises.
- B
Create a VPC endpoint for RDS
Why wrong: Option B is incorrect because although Amazon RDS supports Interface VPC endpoints, these endpoints only allow private access to RDS from within the VPC or via on-premises connections that already exist (like VPN or Direct Connect). A VPC endpoint alone does not provide connectivity from on-premises networks; it requires an underlying network connection such as VPN or Direct Connect. Therefore, using only a VPC endpoint does not meet the requirement.
- C
Configure VPC Peering between the on-premises network and the VPC
Why wrong: VPC Peering does not support on-premises networks; it connects VPCs within AWS.
- D
Establish an AWS Site-to-Site VPN connection
A VPN connection securely connects on-premises to the VPC, allowing private access to RDS.
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 allow its developers to access Amazon RDS databases from their on-premises network without traversing the public internet. Which solution meets this requirement?
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
Establish an AWS Site-to-Site VPN connection
The correct answer is D because an AWS Site-to-Site VPN connection establishes a secure, encrypted tunnel between the on-premises network and the Amazon VPC, allowing resources like RDS databases to be accessed privately without traversing the public internet. Option A is incorrect because a NAT gateway enables outbound internet traffic from a private subnet, not inbound private access from on-premises. Option B is incorrect because RDS does not support VPC endpoints (interface or gateway); VPC endpoints are used for services like S3 or DynamoDB. Option C is incorrect because VPC Peering connects two VPCs within AWS, not an on-premises network to a VPC.
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.
- ✗
Use a NAT gateway in the VPC
- ✗
Create a VPC endpoint for RDS
Why it's wrong here
Option B is incorrect because although Amazon RDS supports Interface VPC endpoints, these endpoints only allow private access to RDS from within the VPC or via on-premises connections that already exist (like VPN or Direct Connect). A VPC endpoint alone does not provide connectivity from on-premises networks; it requires an underlying network connection such as VPN or Direct Connect. Therefore, using only a VPC endpoint does not meet the requirement.
- ✗
Configure VPC Peering between the on-premises network and the VPC
Why it's wrong here
VPC Peering does not support on-premises networks; it connects VPCs within AWS.
- ✓
Establish an AWS Site-to-Site VPN connection
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.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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: Establish an AWS Site-to-Site VPN connection — The correct answer is D because an AWS Site-to-Site VPN connection establishes a secure, encrypted tunnel between the on-premises network and the Amazon VPC, allowing resources like RDS databases to be accessed privately without traversing the public internet. Option A is incorrect because a NAT gateway enables outbound internet traffic from a private subnet, not inbound private access from on-premises. Option B is incorrect because RDS does not support VPC endpoints (interface or gateway); VPC endpoints are used for services like S3 or DynamoDB. Option C is incorrect because VPC Peering connects two VPCs within AWS, not an on-premises network to a VPC.
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
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