- A
Create VPC gateway endpoints for all AWS services in each VPC.
Why wrong: Gateway endpoints do not provide general internet access.
- B
Set up a VPN connection from each VPC to the shared services VPC and use the latter's internet gateway.
Why wrong: VPN adds complexity and is not scalable.
- C
Attach all VPCs to a transit gateway and route traffic through a shared services VPC that has NAT gateway and internet gateway.
Transit gateway enables transitive routing and centralized internet.
- D
Peer each VPC to the shared services VPC and configure a default route pointing to the shared services VPC's NAT gateway.
Why wrong: VPC peering does not support transitive routing.
Question 303 of 1,705
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 is designing a multi-account AWS environment using AWS Organizations. The company wants to centralize outbound internet traffic from all VPCs in all accounts through a single VPC in a shared services account. The shared services account has a VPC with a NAT gateway and an internet gateway. Which architecture meets this requirement?
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
✓
Attach all VPCs to a transit gateway and route traffic through a shared services VPC that has NAT gateway and internet gateway.
Option C is correct because a transit gateway allows you to centrally route traffic from multiple VPCs across different AWS accounts to a shared services VPC. By attaching all VPCs to a transit gateway and configuring route tables appropriately, you can force all outbound internet traffic from the spoke VPCs to go through the shared services VPC's NAT gateway and internet gateway, centralizing egress traffic.
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 VPC gateway endpoints for all AWS services in each VPC.
Why it's wrong here
Gateway endpoints do not provide general internet access.
- ✗
Set up a VPN connection from each VPC to the shared services VPC and use the latter's internet gateway.
Why it's wrong here
VPN adds complexity and is not scalable.
- ✓
Attach all VPCs to a transit gateway and route traffic through a shared services VPC that has NAT gateway and internet gateway.
Why this is correct
Transit gateway enables transitive routing and centralized internet.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Peer each VPC to the shared services VPC and configure a default route pointing to the shared services VPC's NAT gateway.
Why it's wrong here
VPC peering does not support transitive routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume VPC peering can be used as a hub-and-spoke solution for internet egress, but they forget that VPC peering does not support transitive routing and that NAT gateways are not reachable across a peering connection, making Option D invalid.
Detailed technical explanation
How to think about this question
A transit gateway acts as a cloud router using a hub-and-spoke model, supporting transitive routing between attached VPCs and VPN connections. When you attach VPCs from different accounts using AWS Resource Access Manager, you can centralize egress by adding a default route (0.0.0.0/0) in the transit gateway route table pointing to the shared services VPC attachment, and each spoke VPC's route table points to the transit gateway for internet-bound traffic. This architecture scales to hundreds of VPCs without the limitations of VPC peering (no transitive routing) or VPN (throughput and latency overhead).
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Attach all VPCs to a transit gateway and route traffic through a shared services VPC that has NAT gateway and internet gateway. — Option C is correct because a transit gateway allows you to centrally route traffic from multiple VPCs across different AWS accounts to a shared services VPC. By attaching all VPCs to a transit gateway and configuring route tables appropriately, you can force all outbound internet traffic from the spoke VPCs to go through the shared services VPC's NAT gateway and internet gateway, centralizing egress traffic.
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
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