The correct configuration is to add a route in the VPC route table for the on-premises CIDR 192.168.0.0/16 with the target set to the virtual private gateway. This is required because when using a Site-to-Site VPN with static routes, the VPC must explicitly know how to reach the remote network; the virtual private gateway acts as the next hop for all traffic destined for the on-premises network, and the static route tells the VPC to send that traffic through the VPN tunnel. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of the fundamental difference between static and dynamic (BGP) route propagation for VPNs—a common trap is assuming you must also configure static routes on the on-premises side, but AWS only requires the VPC route table entry. Remember the memory tip: "VPC routes point to the VGW; on-prem routes are the customer's job."
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 VPC with a CIDR of 10.0.0.0/16. It has two subnets: 10.0.1.0/24 (public) and 10.0.2.0/24 (private). The company wants to use AWS Site-to-Site VPN to connect to an on-premises network with a CIDR of 192.168.0.0/16. The VPN connection uses a virtual private gateway (VGW) attached to the VPC. The on-premises network has a VPN appliance that supports BGP. The company also wants to use static routes for the VPN. Which configuration is required to enable communication between the VPC and on-premises network?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a route in the VPC route table for 192.168.0.0/16 with target the virtual private gateway.
For a VPN using a virtual private gateway with static routes, you must add a route in the VPC route table for the on-premises CIDR (192.168.0.0/16) pointing to the virtual private gateway. Option A is correct. Option B is incorrect because the route must be to the VGW. Option C is incorrect because you don't need to modify the on-premises route table. Option D is incorrect because NAT is not required.
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 route in the on-premises route table for 10.0.0.0/16 pointing to the VPN appliance.
Why it's wrong here
This is necessary on-premises, but the question asks for VPC configuration.
✓
Add a route in the VPC route table for 192.168.0.0/16 with target the virtual private gateway.
Why this is correct
This routes traffic from the VPC to the on-premises network via the VPN.
Create a NAT gateway in the public subnet and route traffic through it.
Why it's wrong here
NAT is for outbound internet access, not VPN connectivity.
✗
Add a route in the VPC route table for 192.168.0.0/16 with target the internet gateway.
Why it's wrong here
The internet gateway is for internet traffic, not VPN.
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.
Network Design — This question tests Network Design — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Add a route in the VPC route table for 192.168.0.0/16 with target the virtual private gateway. — For a VPN using a virtual private gateway with static routes, you must add a route in the VPC route table for the on-premises CIDR (192.168.0.0/16) pointing to the virtual private gateway. Option A is correct. Option B is incorrect because the route must be to the VGW. Option C is incorrect because you don't need to modify the on-premises route table. Option D is incorrect because NAT is not required.
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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