- A
Use a Network Load Balancer in each VPC to distribute traffic to inspection appliances.
Why wrong: NLB does not provide internet egress.
- B
Create a Transit Gateway with a central inspection VPC that has a NAT Gateway and route all VPCs to the inspection VPC for egress.
Scalable, centralized, and cost-effective.
- C
Deploy a NAT Gateway in each VPC and route traffic directly to the internet.
Why wrong: No central inspection; high cost.
- D
Set up VPC peering between all VPCs and route traffic through a single VPC with an Internet Gateway.
Why wrong: VPC peering is not transitive and does not scale.
Question 854 of 1,705
Scalable and Cost-Effective Centralized Egress: Transit Gateway with Inspection VPC and NAT Gateway
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 multi-account AWS Organizations setup with hundreds of VPCs across multiple regions. The network team needs to centralize outbound internet traffic through a set of inspection VPCs for security monitoring. Which solution is MOST scalable and cost-effective?
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 Transit Gateway with a central inspection VPC that has a NAT Gateway and route all VPCs to the inspection VPC for egress.
Option B is correct because a Transit Gateway with a central inspection VPC centralizes egress traffic through a single NAT Gateway, eliminating the need for per-VPC NAT Gateways. This architecture scales horizontally by attaching hundreds of VPCs to the Transit Gateway and routing all 0.0.0.0/0 traffic to the inspection VPC, which is cost-effective as it reduces NAT Gateway hourly charges and data processing costs across multiple regions.
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.
- ✗
Use a Network Load Balancer in each VPC to distribute traffic to inspection appliances.
Why it's wrong here
NLB does not provide internet egress.
- ✓
Create a Transit Gateway with a central inspection VPC that has a NAT Gateway and route all VPCs to the inspection VPC for egress.
Why this is correct
Scalable, centralized, and cost-effective.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deploy a NAT Gateway in each VPC and route traffic directly to the internet.
Why it's wrong here
No central inspection; high cost.
- ✗
Set up VPC peering between all VPCs and route traffic through a single VPC with an Internet Gateway.
Why it's wrong here
VPC peering is not transitive and does not scale.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume VPC peering can be used for transitive routing (Option D), but AWS explicitly prohibits transitive routing through VPC peering, making Transit Gateway the only scalable solution for hub-and-spoke egress with hundreds of VPCs.
Detailed technical explanation
How to think about this question
Transit Gateway uses route tables to propagate a default route (0.0.0.0/0) from the inspection VPC to all attached VPCs, enabling centralized egress without transitive peering limitations. The inspection VPC typically contains a NAT Gateway in a public subnet and a Transit Gateway attachment in a private subnet, with security appliances (e.g., firewalls) inspecting traffic before it reaches the NAT Gateway. In a multi-region setup, you can use Transit Gateway inter-region peering to centralize egress across regions, but beware of data transfer costs and latency when routing traffic through a single region.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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: Create a Transit Gateway with a central inspection VPC that has a NAT Gateway and route all VPCs to the inspection VPC for egress. — Option B is correct because a Transit Gateway with a central inspection VPC centralizes egress traffic through a single NAT Gateway, eliminating the need for per-VPC NAT Gateways. This architecture scales horizontally by attaching hundreds of VPCs to the Transit Gateway and routing all 0.0.0.0/0 traffic to the inspection VPC, which is cost-effective as it reduces NAT Gateway hourly charges and data processing costs across multiple regions.
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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