- A
Place the firewall in the same subnet as the web tier and use security groups to redirect traffic.
Why wrong: Security groups do not perform routing or redirection.
- B
Place the firewall in a separate subnet and use network ACLs to force traffic through it.
Why wrong: Network ACLs filter packets, they do not route traffic to a specific instance.
- C
Use a Gateway Load Balancer to deploy the firewall appliance in a separate subnet, and configure route tables to send inter-subnet traffic to the Gateway Load Balancer endpoint.
GWLB transparently intercepts traffic for inspection.
- D
Use a transit gateway with appliance mode and attach all subnets to it, then configure routing to send traffic through the firewall.
Why wrong: More complex and not the simplest solution.
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 running a stateful firewall appliance in an EC2 instance in a VPC. The appliance inspects traffic between subnets. The company needs to ensure that traffic from the web tier subnet to the application tier subnet passes through the firewall, but the firewall itself must not affect other traffic. Which configuration should the company implement?
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 a Gateway Load Balancer to deploy the firewall appliance in a separate subnet, and configure route tables to send inter-subnet traffic to the Gateway Load Balancer endpoint.
Option C is correct because a Gateway Load Balancer (GWLB) allows you to deploy a fleet of third-party firewall appliances in a separate subnet and use a Gateway Load Balancer endpoint (GWLBe) to transparently intercept and steer inter-subnet traffic through the firewall. By configuring the route tables of the web and application subnets to send traffic to the GWLBe, the firewall inspects only the desired traffic without affecting other VPC traffic, as the GWLB operates at Layer 3 (Geneve encapsulation) and does not alter the source/destination IP addresses.
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.
- ✗
Place the firewall in the same subnet as the web tier and use security groups to redirect traffic.
Why it's wrong here
Security groups do not perform routing or redirection.
- ✗
Place the firewall in a separate subnet and use network ACLs to force traffic through it.
Why it's wrong here
Network ACLs filter packets, they do not route traffic to a specific instance.
- ✓
Use a Gateway Load Balancer to deploy the firewall appliance in a separate subnet, and configure route tables to send inter-subnet traffic to the Gateway Load Balancer endpoint.
Why this is correct
GWLB transparently intercepts traffic for inspection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a transit gateway with appliance mode and attach all subnets to it, then configure routing to send traffic through the firewall.
Why it's wrong here
More complex and not the simplest solution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that network ACLs or security groups can redirect traffic to a firewall appliance, but these are filtering mechanisms, not routing or forwarding mechanisms; the trap here is confusing stateless/stateful filtering with traffic steering, which requires route table manipulation or a Gateway Load Balancer endpoint.
Detailed technical explanation
How to think about this question
Gateway Load Balancer uses the Geneve tunneling protocol (UDP port 6081) to encapsulate traffic between the GWLBe and the firewall appliance, preserving the original packet headers for stateful inspection. This allows the firewall to see the true source and destination IPs while the GWLB handles load balancing and health checks. In a real-world scenario, this setup is ideal for deploying next-generation firewalls (NGFWs) that need to inspect east-west traffic within a VPC without requiring complex routing or NAT tricks.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: Use a Gateway Load Balancer to deploy the firewall appliance in a separate subnet, and configure route tables to send inter-subnet traffic to the Gateway Load Balancer endpoint. — Option C is correct because a Gateway Load Balancer (GWLB) allows you to deploy a fleet of third-party firewall appliances in a separate subnet and use a Gateway Load Balancer endpoint (GWLBe) to transparently intercept and steer inter-subnet traffic through the firewall. By configuring the route tables of the web and application subnets to send traffic to the GWLBe, the firewall inspects only the desired traffic without affecting other VPC traffic, as the GWLB operates at Layer 3 (Geneve encapsulation) and does not alter the source/destination IP addresses.
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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