- A
Add a route in the on-premises route table for 10.0.0.0/16 pointing to the VPN appliance.
Why wrong: This is necessary on-premises, but the question asks for VPC configuration.
- B
Add a route in the VPC route table for 192.168.0.0/16 with target the virtual private gateway.
This routes traffic from the VPC to the on-premises network via the VPN.
- C
Create a NAT gateway in the public subnet and route traffic through it.
Why wrong: NAT is for outbound internet access, not VPN connectivity.
- D
Add a route in the VPC route table for 192.168.0.0/16 with target the internet gateway.
Why wrong: The internet gateway is for internet traffic, not VPN.
Question 195 of 1,705
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 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 route in the VPC route table for 192.168.0.0/16 with target the virtual private gateway.
Option B is correct because for a Site-to-Site VPN using a virtual private gateway (VGW), you must add a route in the VPC route table for the on-premises CIDR (192.168.0.0/16) with the VGW as the target. This directs traffic destined for the on-premises network through the VPN tunnel. Even though BGP is supported, the company explicitly wants to use static routes, so manual route entries are required in the VPC route table.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a NAT gateway in the public subnet and route traffic through it.
- ✗
Add a route in the VPC route table for 192.168.0.0/16 with target the internet gateway.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the need for a NAT gateway or internet gateway for VPN traffic, but Site-to-Site VPN traffic must be routed through the VGW, not through NAT or IGW.
Detailed technical explanation
How to think about this question
When using a virtual private gateway with static routes, each route in the VPC route table must explicitly point to the VGW for the remote network. The VGW uses BGP to exchange routes with the on-premises VPN appliance, but if static routes are configured, the VGW only accepts traffic for the specified prefixes. In a real-world scenario, if the on-premises network has multiple subnets, you would need to add a route for each subnet or a summary route like 192.168.0.0/16 to the VPC route table.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
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. — Option B is correct because for a Site-to-Site VPN using a virtual private gateway (VGW), you must add a route in the VPC route table for the on-premises CIDR (192.168.0.0/16) with the VGW as the target. This directs traffic destined for the on-premises network through the VPN tunnel. Even though BGP is supported, the company explicitly wants to use static routes, so manual route entries are required in the VPC route table.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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