- A
Route tables in the VPC and on-premises router.
Routes are required for traffic forwarding.
- B
Security group rules for the EC2 instances.
Security groups control inbound/outbound traffic.
- C
NAT gateway configuration in the VPC.
Why wrong: NAT gateway is for internet access, not VPN.
- D
Network ACL rules for the subnets.
NACLs are stateless and must allow traffic.
- E
Internet gateway attachment to the VPC.
Why wrong: IGW is for internet access, not VPN.
Question 931 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 is setting up a Site-to-Site VPN connection between an on-premises network and AWS. The VPN tunnel is established, but traffic is not flowing. Which THREE configuration items should be checked?
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
✓
Route tables in the VPC and on-premises router.
Option A is correct because route tables in both the VPC and the on-premises router must have entries directing traffic for the remote network (e.g., the on-premises CIDR in the VPC route table, and the VPC CIDR in the on-premises route table) toward the VPN gateway or the VPN tunnel interface. Without these routes, packets have no path to reach the other side, even if the tunnel itself is up. This is a fundamental requirement for any Site-to-Site VPN to forward traffic.
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.
- ✓
Route tables in the VPC and on-premises router.
Why this is correct
Routes are required for traffic forwarding.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Security group rules for the EC2 instances.
Why this is correct
Security groups control inbound/outbound traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
NAT gateway configuration in the VPC.
- ✓
Network ACL rules for the subnets.
Why this is correct
NACLs are stateless and must allow traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Internet gateway attachment to the VPC.
Why it's wrong here
IGW is for internet access, not VPN.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a 'UP' tunnel status guarantees traffic flow, but AWS explicitly tests that routing, security groups, and network ACLs are separate layers that must all be correctly configured for end-to-end connectivity.
Detailed technical explanation
How to think about this question
Under the hood, a Site-to-Site VPN uses IPsec tunnels between the customer gateway (CGW) and the virtual private gateway (VGW). Even when both Phase 1 and Phase 2 of IPsec are established (tunnel status shows 'UP'), traffic will not flow unless the VPC route table has a static route pointing the on-premises CIDR to the VGW, and the on-premises router has a route pointing the VPC CIDR to the tunnel interface. Additionally, the VGW must be attached to the VPC and the route propagation from the VGW must be enabled (or static routes added) for the VPC route table to learn the on-premises prefixes.
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 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: Route tables in the VPC and on-premises router. — Option A is correct because route tables in both the VPC and the on-premises router must have entries directing traffic for the remote network (e.g., the on-premises CIDR in the VPC route table, and the VPC CIDR in the on-premises route table) toward the VPN gateway or the VPN tunnel interface. Without these routes, packets have no path to reach the other side, even if the tunnel itself is up. This is a fundamental requirement for any Site-to-Site VPN to forward traffic.
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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