- A
Create a firewall VPC with the appliance and use Transit Gateway route tables to direct traffic through it
This allows centralized inspection via routing.
- B
Use VPC security groups across VPCs
Why wrong: Security groups cannot be applied across VPC peering or Transit Gateway.
- C
Use AWS Network Firewall directly in each VPC
Why wrong: While possible, it is less centralized and more complex than a single inspection VPC.
- D
Use network ACLs on each VPC subnet
Why wrong: Network ACLs are stateless and do not provide deep packet inspection.
Question 346 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 has an AWS Transit Gateway with multiple VPC attachments. They need to inspect traffic between VPCs using a third-party firewall appliance. What is the best approach?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
✓
Create a firewall VPC with the appliance and use Transit Gateway route tables to direct traffic through it
The best approach is to create a dedicated firewall VPC that hosts the third-party firewall appliance and use Transit Gateway (TGW) route tables to steer inter-VPC traffic through that VPC. By attaching the firewall VPC to the TGW and configuring route tables with static routes pointing to the firewall VPC attachment, all traffic between other VPCs can be forced to traverse the firewall for inspection. This provides centralized, scalable traffic inspection without requiring changes to individual VPC routing or security group configurations.
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 firewall VPC with the appliance and use Transit Gateway route tables to direct traffic through it
Why this is correct
This allows centralized inspection via routing.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use VPC security groups across VPCs
Why it's wrong here
Security groups cannot be applied across VPC peering or Transit Gateway.
- ✗
Use AWS Network Firewall directly in each VPC
Why it's wrong here
While possible, it is less centralized and more complex than a single inspection VPC.
- ✗
Use network ACLs on each VPC subnet
Why it's wrong here
Network ACLs are stateless and do not provide deep packet inspection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that security groups or network ACLs can be used for inter-VPC traffic inspection, but they are per-VPC constructs that cannot inspect traffic traversing a Transit Gateway.
Detailed technical explanation
How to think about this question
Transit Gateway supports multiple route tables, allowing you to isolate VPC attachments and create a 'spoke-and-firewall' topology. By placing the firewall VPC in a separate route table (the 'inspection' route table) and associating all other VPC attachments with it, you can add a static route (e.g., 0.0.0.0/0) pointing to the firewall VPC attachment, ensuring all inter-VPC traffic is forwarded to the firewall. The firewall appliance must be configured to perform source/destination NAT or use IP forwarding (e.g., via EC2 with IP forwarding enabled) to avoid asymmetric routing, as TGW does not support hairpinning by default without explicit route table design.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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: Create a firewall VPC with the appliance and use Transit Gateway route tables to direct traffic through it — The best approach is to create a dedicated firewall VPC that hosts the third-party firewall appliance and use Transit Gateway (TGW) route tables to steer inter-VPC traffic through that VPC. By attaching the firewall VPC to the TGW and configuring route tables with static routes pointing to the firewall VPC attachment, all traffic between other VPCs can be forced to traverse the firewall for inspection. This provides centralized, scalable traffic inspection without requiring changes to individual VPC routing or security group configurations.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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