The most scalable architecture is to use a Gateway Load Balancer with firewall appliances deployed in each Availability Zone. This design is correct because the Gateway Load Balancer (GWLB) sits transparently in the data path, allowing it to horizontally scale firewall instances across multiple AZs while preserving the source IP and packet headers for inspection. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how to integrate third-party security appliances without creating a single point of failure or bottleneck; a common trap is assuming a Network Load Balancer can inspect traffic, but it only load balances at layer 4. The key memory tip is to remember that GWLB is the only AWS load balancer designed specifically for transparent inline inspection of all traffic flows, making it the natural choice for scalable firewall architecture.
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 deployed a web application on EC2 instances behind an Application Load Balancer (ALB) in a VPC. The application must be accessible over the internet, but the security team requires that all traffic be inspected by a third-party firewall appliance. What is the MOST scalable architecture?
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 with firewall appliances in each Availability Zone.
Option C is correct because using GatewayLoad Balancer with the firewall appliances in different AZs provides high availability and scalability. Option A is wrong because a single firewall is a SPOF. Option B is wrong because EC2 instances as next-hop in route table is not scalable. Option D is wrong because Network Load Balancer does not inspect traffic; it load balances.
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.
✗
Configure a Network Load Balancer with target groups pointing to firewall appliances.
Why it's wrong here
NLB does not inspect; it load balances.
✗
Use an EC2 instance as a transparent proxy and set it as the next-hop in the route table.
Why it's wrong here
EC2 instance as next-hop is not scalable and hard to manage.
✓
Use a Gateway Load Balancer with firewall appliances in each Availability Zone.
Why this is correct
GWLB provides scalable, HA traffic inspection.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy a single firewall appliance in one Availability Zone and route all traffic through it.
Why it's wrong here
Single point of failure; not scalable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
What to study next
Got this wrong? Here's your next step.
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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 with firewall appliances in each Availability Zone. — Option C is correct because using Gateway Load Balancer with the firewall appliances in different AZs provides high availability and scalability. Option A is wrong because a single firewall is a SPOF. Option B is wrong because EC2 instances as next-hop in route table is not scalable. Option D is wrong because Network Load Balancer does not inspect traffic; it load balances.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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