- A
Add a static route in the VPC route table for the on-premises CIDR block pointing to the virtual private gateway.
A static route forces traffic destined for on-premises through the VPN tunnel, ensuring encryption.
- B
Disable route propagation on the VPC route table to remove any dynamic routes from the VPN.
Why wrong: Disabling route propagation removes BGP-learned routes, but if there is a default route to an internet gateway, traffic may still go over the internet.
- C
Enable IPsec acceleration on the VPN tunnel to ensure all traffic is encrypted.
Why wrong: IPsec acceleration improves throughput but does not enforce routing; traffic must still be routed through the VPN tunnel.
- D
Replace the virtual private gateway with a transit gateway and attach the VPN connection.
Why wrong: A transit gateway is not required; the virtual private gateway can handle the VPN. The issue is routing, not the gateway type.
Quick Answer
The answer is adding a static route in the VPC route table for the on-premises CIDR block pointing to the virtual private gateway. This configuration enforces encryption by ensuring that all traffic destined for the on-premises network is explicitly routed through the VPN tunnel, rather than taking a default path through the internet gateway. The core issue here is routing precedence: without a specific static route pointing to the virtual private gateway, traffic may follow a more specific or default route that bypasses the encrypted tunnel, even though the VPN itself is properly configured with IPsec. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how VPC route tables interact with VPN connections and the importance of explicit routing to enforce encryption. A common trap is assuming that disabling route propagation or modifying the VPN tunnel settings will fix the problem, but the real culprit is the absence of a targeted static route. Memory tip: think of the static route as a “forced encryption signpost” that directs traffic away from the open internet and into the secure tunnel.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 has a hybrid network with an AWS Site-to-Site VPN connection to an on-premises data center. The network team wants to ensure that only encrypted traffic is sent over the internet between the two sites. The VPC has a virtual private gateway attached. When testing, they discover that some traffic is going over the internet without encryption. Which configuration change should be made to enforce encryption?
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
Add a static route in the VPC route table for the on-premises CIDR block pointing to the virtual private gateway.
Option D is correct because adding a static route in the VPC route table pointing to the virtual private gateway forces traffic to the on-premises network through the VPN tunnel, ensuring encryption. Option A is wrong because disabling route propagation would remove dynamic routes, but the traffic might still use the internet gateway if a more specific route exists. Option B is wrong because the VPN tunnel already uses IPsec; the issue is routing. Option C is wrong because the VPN connection uses a virtual private gateway, not a transit gateway.
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.
- ✓
Add a static route in the VPC route table for the on-premises CIDR block pointing to the virtual private gateway.
Why this is correct
A static route forces traffic destined for on-premises through the VPN tunnel, ensuring encryption.
Related concept
CIDR notation defines the prefix length.
- ✗
Disable route propagation on the VPC route table to remove any dynamic routes from the VPN.
Why it's wrong here
Disabling route propagation removes BGP-learned routes, but if there is a default route to an internet gateway, traffic may still go over the internet.
- ✗
Enable IPsec acceleration on the VPN tunnel to ensure all traffic is encrypted.
- ✗
Replace the virtual private gateway with a transit gateway and attach the 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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: Add a static route in the VPC route table for the on-premises CIDR block pointing to the virtual private gateway. — Option D is correct because adding a static route in the VPC route table pointing to the virtual private gateway forces traffic to the on-premises network through the VPN tunnel, ensuring encryption. Option A is wrong because disabling route propagation would remove dynamic routes, but the traffic might still use the internet gateway if a more specific route exists. Option B is wrong because the VPN tunnel already uses IPsec; the issue is routing. Option C is wrong because the VPN connection uses a virtual private gateway, not a transit gateway.
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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