- A
Customer Gateway
Required to represent the on-premises router.
- B
AWS Direct Connect
Why wrong: Separate dedicated connection, not VPN.
- C
VPN Connection
The actual VPN tunnel between VPG and CGW.
- D
AWS Transit Gateway
Why wrong: Not required for a basic site-to-site VPN.
- E
Virtual Private Gateway
Required on the VPC side.
Question 556 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 has a VPC with a CIDR of 10.0.0.0/16. They have two Availability Zones, each with a public and a private subnet. They want to connect their on-premises network (192.168.0.0/16) to the VPC using a site-to-site VPN. Which THREE resources are needed to establish the VPN connection? (Choose THREE.)
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
✓
Customer Gateway
A Customer Gateway (option A) is required because it represents the on-premises VPN device in AWS, providing the public IP address and routing information needed to establish the IPsec tunnel. A VPN Connection (option C) is the logical resource that ties together the Customer Gateway and the Virtual Private Gateway, defining the tunnel settings, pre-shared keys, and routing options. A Virtual Private Gateway (option E) is the AWS-side endpoint attached to the VPC that terminates the VPN tunnels and routes traffic between the VPC and the on-premises network.
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.
- ✓
Customer Gateway
Why this is correct
Required to represent the on-premises router.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Direct Connect
Why it's wrong here
Separate dedicated connection, not VPN.
- ✓
VPN Connection
Why this is correct
The actual VPN tunnel between VPG and CGW.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Transit Gateway
Why it's wrong here
Not required for a basic site-to-site VPN.
- ✓
Virtual Private Gateway
Why this is correct
Required on the VPC side.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Transit Gateway as a mandatory component for VPNs, but it is only needed when connecting multiple VPCs or VPNs centrally, not for a single VPC-to-on-premises VPN.
Detailed technical explanation
How to think about this question
A site-to-site VPN uses IPsec (IKEv1 or IKEv2) to create encrypted tunnels over the internet. The Virtual Private Gateway supports dynamic routing via BGP (using ASN) or static routing, and the VPN Connection resource manages up to two tunnels for high availability. In real-world scenarios, if the on-premises device supports BGP, the VPN can automatically exchange routes, reducing manual configuration overhead.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Visual reference
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: Customer Gateway — A Customer Gateway (option A) is required because it represents the on-premises VPN device in AWS, providing the public IP address and routing information needed to establish the IPsec tunnel. A VPN Connection (option C) is the logical resource that ties together the Customer Gateway and the Virtual Private Gateway, defining the tunnel settings, pre-shared keys, and routing options. A Virtual Private Gateway (option E) is the AWS-side endpoint attached to the VPC that terminates the VPN tunnels and routes traffic between the VPC and the on-premises network.
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
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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