The answer is to use AWS Client VPN as an alternative to IPsec site-to-site VPN when the on-premises firewall does not support IPsec. This solution works because AWS Client VPN is a fully managed, OpenVPN-based service that can terminate individual client connections or route entire network traffic, allowing the on-premises firewall to act as a client if it supports the OpenVPN protocol. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of VPN termination options beyond traditional IPsec, specifically how Client VPN can bridge non-IPsec environments into AWS. A common trap is confusing Client VPN with Direct Connect or Transit Gateway, but remember that Direct Connect is a physical layer service and Transit Gateway is a hub for routing, not a VPN endpoint. The key memory tip is: when IPsec is blocked, think OpenVPN—Client VPN is the software-based escape hatch for legacy firewalls.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 needs to connect its on-premises data center to AWS using a site-to-site VPN. The on-premises firewall does not support IPsec. What alternative solution can the company use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Client VPN to establish a VPN connection from the on-premises network.
Option B is correct because AWS Client VPN allows individual clients or the entire network to connect using OpenVPN-based software, which can be installed on the firewall if it supports OpenVPN. Option A is wrong because Direct Connect is a physical connection. Option C is wrong because Transit Gateway is a network transit hub, not a VPN endpoint. Option D is wrong because VPC peering is for VPC-to-VPC connectivity.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Create a VPC peering connection between the on-premises router and the VPC.
Why it's wrong here
VPC peering is for VPC-to-VPC only.
✓
Use AWS Client VPN to establish a VPN connection from the on-premises network.
Why this is correct
Client VPN can terminate on a firewall running OpenVPN.
Related concept
Static NAT maps one inside address to one outside address.
✗
Deploy an AWS Transit Gateway and attach the on-premises network via a VPC attachment.
Why it's wrong here
Transit Gateway itself does not provide VPN termination.
✗
Use AWS Direct Connect to establish a dedicated physical link.
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use AWS Client VPN to establish a VPN connection from the on-premises network. — Option B is correct because AWS Client VPN allows individual clients or the entire network to connect using OpenVPN-based software, which can be installed on the firewall if it supports OpenVPN. Option A is wrong because Direct Connect is a physical connection. Option C is wrong because Transit Gateway is a network transit hub, not a VPN endpoint. Option D is wrong because VPC peering is for VPC-to-VPC connectivity.
What should I do if I get this ANS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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