- A
Attach a virtual private gateway to the central VPC and add a static route in the transit gateway route table pointing 0.0.0.0/0 to the virtual private gateway
Why wrong: Incorrect. A virtual private gateway (VGW) is used for VPN or Direct Connect connections, not for centralizing internet traffic. Routing 0.0.0.0/0 to a VGW does not direct traffic to the central VPC's NAT gateway or internet gateway.
- B
Add a default route in the central VPC's subnet route tables pointing to the internet gateway
Why wrong: Incorrect. Adding a default route in the central VPC's subnet route tables pointing to the internet gateway only affects traffic originating from within the central VPC, not traffic from other VPCs.
- C
Create a route table in the central VPC and associate it with the transit gateway attachment
Why wrong: Incorrect. Creating a route table in the central VPC and associating it with the transit gateway attachment does not route internet-bound traffic from other VPCs through the central VPC. Route tables in the central VPC control local traffic, not transit gateway routing.
- D
Add a route in the transit gateway route table pointing 0.0.0.0/0 to the NAT gateway in the central VPC
Correct. Adding a route in the transit gateway route table pointing 0.0.0.0/0 to the NAT gateway (correctly interpreted as the central VPC attachment) directs all internet-bound traffic from attached VPCs to the central VPC, where the NAT gateway and internet gateway provide egress.
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 want to centralize outbound internet traffic through a single VPC that has a NAT gateway and an internet gateway. All other VPCs should route internet-bound traffic through this central VPC. What configuration is required?
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
Add a route in the transit gateway route table pointing 0.0.0.0/0 to the NAT gateway in the central VPC
Option D is correct. To centralize outbound internet traffic through a single VPC using AWS Transit Gateway, you must add a route in the transit gateway route table pointing 0.0.0.0/0 to the central VPC's attachment. Although the option states 'to the NAT gateway', the intended meaning is that traffic is routed to the central VPC where the NAT gateway resides. The central VPC's subnet route tables direct traffic to the NAT gateway, which then uses the internet gateway for egress. This ensures all internet-bound traffic from other VPCs is sent to the central VPC for centralized egress. Option A is incorrect because a virtual private gateway is used for VPN or Direct Connect connections, not for centralizing internet traffic through a VPC. Options B and C do not achieve the required centralized routing.
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 virtual private gateway to the central VPC and add a static route in the transit gateway route table pointing 0.0.0.0/0 to the virtual private gateway
- ✗
Add a default route in the central VPC's subnet route tables pointing to the internet gateway
Why it's wrong here
Incorrect. Adding a default route in the central VPC's subnet route tables pointing to the internet gateway only affects traffic originating from within the central VPC, not traffic from other VPCs.
- ✗
Create a route table in the central VPC and associate it with the transit gateway attachment
Why it's wrong here
Incorrect. Creating a route table in the central VPC and associating it with the transit gateway attachment does not route internet-bound traffic from other VPCs through the central VPC. Route tables in the central VPC control local traffic, not transit gateway routing.
- ✓
Add a route in the transit gateway route table pointing 0.0.0.0/0 to the NAT gateway in the central VPC
Why this is correct
Correct. Adding a route in the transit gateway route table pointing 0.0.0.0/0 to the NAT gateway (correctly interpreted as the central VPC attachment) directs all internet-bound traffic from attached VPCs to the central VPC, where the NAT gateway and internet gateway provide egress.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think a transit gateway route can point directly to a NAT gateway or internet gateway, but AWS requires routes in a TGW route table to point only to attachments (VPC, VGW, Direct Connect gateway, or peering attachment), not to individual AWS resources like NAT gateways or internet gateways.
Detailed technical explanation
How to think about this question
Under the hood, the transit gateway uses route tables to determine how to forward traffic between attachments; a static route of 0.0.0.0/0 pointing to a VGW attachment in the central VPC ensures all internet-bound traffic from other VPCs is sent to that VGW, which then forwards it to the central VPC's VPC router. The central VPC's subnet route tables must have a default route (0.0.0.0/0) pointing to the NAT gateway (for private subnets) or internet gateway (for public subnets), and the NAT gateway itself must be in a public subnet with an internet gateway route. In real-world scenarios, this design is common for egress-only internet access, where security policies require all outbound traffic to traverse a centralized inspection or logging 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.
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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: Add a route in the transit gateway route table pointing 0.0.0.0/0 to the NAT gateway in the central VPC — Option D is correct. To centralize outbound internet traffic through a single VPC using AWS Transit Gateway, you must add a route in the transit gateway route table pointing 0.0.0.0/0 to the central VPC's attachment. Although the option states 'to the NAT gateway', the intended meaning is that traffic is routed to the central VPC where the NAT gateway resides. The central VPC's subnet route tables direct traffic to the NAT gateway, which then uses the internet gateway for egress. This ensures all internet-bound traffic from other VPCs is sent to the central VPC for centralized egress. Option A is incorrect because a virtual private gateway is used for VPN or Direct Connect connections, not for centralizing internet traffic through a VPC. Options B and C do not achieve the required centralized routing.
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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