- A
Create a VPC peering connection between the on-premises router and the VPC.
Why wrong: VPC peering is for VPC-to-VPC only.
- B
Use AWS Client VPN to establish a VPN connection from the on-premises network.
Client VPN can terminate on a firewall running OpenVPN.
- C
Deploy an AWS Transit Gateway and attach the on-premises network via a VPC attachment.
Why wrong: Transit Gateway itself does not provide VPN termination.
- D
Use AWS Direct Connect to establish a dedicated physical link.
Why wrong: Does not use IPsec but is a different service.
Question 552 of 1,705
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 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
✓
Use AWS Client VPN to establish a VPN connection from the on-premises network.
AWS Client VPN is a managed, OpenVPN-based service that allows on-premises clients to securely access AWS resources without requiring IPsec support on the on-premises firewall. Since the firewall does not support IPsec, Client VPN provides an alternative by using TLS-based VPN tunnels that only require standard TCP/UDP ports (typically 443) to be open, making it compatible with nearly any firewall.
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.
- ✗
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.
- ✗
Deploy an AWS Transit Gateway and attach the on-premises network via a VPC attachment.
- ✗
Use AWS Direct Connect to establish a dedicated physical link.
Why it's wrong here
Does not use IPsec but is a different service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that any VPN requires IPsec, but AWS Client VPN uses TLS-based tunnels (OpenVPN) as an alternative when the on-premises device lacks IPsec support.
Detailed technical explanation
How to think about this question
AWS Client VPN uses the OpenVPN protocol (based on TLS 1.2) and authenticates clients via mutual TLS certificates or Active Directory credentials. Under the hood, it creates a virtual network interface on the client device and routes traffic through a secure tunnel over HTTPS, bypassing the need for IPsec IKE or ESP protocols. In a real-world scenario, if the on-premises firewall only allows outbound HTTPS traffic, Client VPN can still establish connectivity by using TCP port 443, whereas IPsec would be blocked.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
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. — AWS Client VPN is a managed, OpenVPN-based service that allows on-premises clients to securely access AWS resources without requiring IPsec support on the on-premises firewall. Since the firewall does not support IPsec, Client VPN provides an alternative by using TLS-based VPN tunnels that only require standard TCP/UDP ports (typically 443) to be open, making it compatible with nearly any firewall.
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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