- A
Attach a NAT Gateway to each VPC's private subnets.
Why wrong: This decentralizes outbound traffic.
- B
Attach an Internet Gateway to each VPC and route 0.0.0.0/0 to the IGW.
Why wrong: This does not centralize traffic.
- C
Designate one VPC as an egress VPC with a NAT Gateway and Internet Gateway, and use Transit Gateway route tables to route 0.0.0.0/0 from other VPCs to the egress VPC.
This centralizes outbound traffic through a single VPC.
- D
Use a VPN connection to an on-premises data center for internet access.
Why wrong: VPN is not for internet access.
Question 74 of 1,705
Centralized Outbound Internet Traffic with Transit Gateway
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 has a hybrid network with multiple VPCs connected via a Transit Gateway. They need to centralize outbound internet traffic through a single VPC. Which architecture should be used?
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
✓
Designate one VPC as an egress VPC with a NAT Gateway and Internet Gateway, and use Transit Gateway route tables to route 0.0.0.0/0 from other VPCs to the egress VPC.
Option C is correct because it uses a dedicated egress VPC with a NAT Gateway and Internet Gateway, and leverages Transit Gateway route tables to direct 0.0.0.0/0 traffic from all other VPCs to this central point. This architecture centralizes outbound internet traffic, avoids overlapping NAT responsibilities, and maintains a clean hub-and-spoke design where only the egress VPC has direct internet access.
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.
- ✗
Attach a NAT Gateway to each VPC's private subnets.
Why it's wrong here
This decentralizes outbound traffic.
- ✗
Attach an Internet Gateway to each VPC and route 0.0.0.0/0 to the IGW.
Why it's wrong here
This does not centralize traffic.
- ✓
Designate one VPC as an egress VPC with a NAT Gateway and Internet Gateway, and use Transit Gateway route tables to route 0.0.0.0/0 from other VPCs to the egress VPC.
Why this is correct
This centralizes outbound traffic through a single VPC.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a VPN connection to an on-premises data center for internet access.
Why it's wrong here
VPN is not for internet access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume each VPC needs its own NAT Gateway or Internet Gateway for internet access, overlooking the Transit Gateway's ability to centralize egress traffic by manipulating route tables and attachment routing.
Detailed technical explanation
How to think about this question
Under the hood, the Transit Gateway uses separate route tables per VPC attachment; for the egress VPC, the route table must propagate the NAT Gateway's route (0.0.0.0/0 -> NAT Gateway) while other VPCs have a static route pointing 0.0.0.0/0 to the Transit Gateway attachment of the egress VPC. A subtle behavior is that the NAT Gateway must be in a public subnet with an Internet Gateway, and the egress VPC's route table must not have a conflicting local route; additionally, security groups and network ACLs in the egress VPC must allow return traffic from the internet back to the originating VPCs. In a real-world scenario, this design is critical for compliance where all outbound traffic must pass through a central inspection point (e.g., a firewall or proxy) deployed in the egress VPC.
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 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.
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: Designate one VPC as an egress VPC with a NAT Gateway and Internet Gateway, and use Transit Gateway route tables to route 0.0.0.0/0 from other VPCs to the egress VPC. — Option C is correct because it uses a dedicated egress VPC with a NAT Gateway and Internet Gateway, and leverages Transit Gateway route tables to direct 0.0.0.0/0 traffic from all other VPCs to this central point. This architecture centralizes outbound internet traffic, avoids overlapping NAT responsibilities, and maintains a clean hub-and-spoke design where only the egress VPC has direct internet access.
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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