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 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 AWS Transit Gateway with central VPC attachment allows routing all egress traffic through inspection VPCs, and using a single NAT Gateway per AZ in the inspection VPC is scalable and cost-effective. Option A is wrong because each VPC with its own NAT Gateway is not centralized. Option C is wrong because Network Load Balancer is not designed for internet egress. Option D is wrong because VPC peering does not scale to hundreds of VPCs and lacks transitive routing.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
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 AWS Transit Gateway with central VPC attachment allows routing all egress traffic through inspection VPCs, and using a single NAT Gateway per AZ in the inspection VPC is scalable and cost-effective. Option A is wrong because each VPC with its own NAT Gateway is not centralized. Option C is wrong because Network Load Balancer is not designed for internet egress. Option D is wrong because VPC peering does not scale to hundreds of VPCs and lacks transitive routing.
What should I do if I get this ANS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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