The answer is to enable route propagation on the VPC route tables and add a default route (0.0.0.0/0) pointing to the virtual private gateway in the private subnet route tables. This is correct because when the on-premises network advertises a default route via BGP over the Direct Connect private VIF, the virtual private gateway receives it, and with route propagation enabled, the VPC route tables automatically learn that route. However, you must explicitly place a static default route targeting the virtual private gateway in the private subnet route tables to force all internet-bound traffic over the Direct Connect private VIF to the on-premises network, which then uses its own internet breakout. On the ANS-C01 exam, this scenario tests your understanding of how BGP-advertised routes interact with VPC route tables and the distinction between propagated routes and explicit static routes. A common trap is assuming that enabling route propagation alone directs traffic; in reality, you need the explicit default route entry to override any local internet gateway. Memory tip: “Propagate to learn, static to direct.”
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 has a Direct Connect connection with a private VIF attached to a virtual private gateway. The VPC has multiple subnets in two Availability Zones. The on-premises network advertises a default route (0.0.0.0/0) via BGP. The company wants all internet-bound traffic from the VPC to go through the on-premises network. Which THREE actions are required to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a default route pointing to the virtual private gateway in the private subnet route tables.
Option B is correct because adding a default route (0.0.0.0/0) pointing to the virtual private gateway in the private subnet route tables ensures that all internet-bound traffic from those subnets is forwarded over the Direct Connect private VIF to the on-premises network. This leverages the BGP-advertised default route from the on-premises network, allowing the company to enforce its security and routing policies for 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.
✗
Deploy a NAT Gateway in a public subnet.
Why it's wrong here
NATGateway is for outbound internet without on-premises routing.
✓
Add a default route pointing to the virtual private gateway in the private subnet route tables.
Why this is correct
Ensures private subnet traffic goes through Direct Connect.
Related concept
Read the scenario before looking for a memorised answer.
✓
Remove the default route to the internet gateway from the main route table.
Why this is correct
Prevents internet traffic from using IGW.
Related concept
Read the scenario before looking for a memorised answer.
✗
Attach an internet gateway to the VPC.
Why it's wrong here
IGW would provide direct internet access, bypassing on-premises.
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that a NATGateway or internet gateway is required for outbound internet traffic, but in this scenario, the on-premises network acts as the internet gateway, so the correct approach is to route traffic over the Direct Connect connection using the virtual private gateway.
Detailed technical explanation
How to think about this question
When a Direct Connect private VIF is attached to a virtual private gateway, BGP sessions exchange routes between the on-premises network and the VPC. The on-premises network advertising a default route (0.0.0.0/0) via BGP allows the virtual private gateway to propagate that route into VPC route tables if route propagation is enabled (Option E). The most specific route wins in the VPC route table, so a static default route pointing to the virtual private gateway (Option B) ensures that traffic from private subnets is sent over Direct Connect, while removing the default route to the internet gateway (Option C) prevents any direct internet access from the main route table.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Add a default route pointing to the virtual private gateway in the private subnet route tables. — Option B is correct because adding a default route (0.0.0.0/0) pointing to the virtual private gateway in the private subnet route tables ensures that all internet-bound traffic from those subnets is forwarded over the Direct Connect private VIF to the on-premises network. This leverages the BGP-advertised default route from the on-premises network, allowing the company to enforce its security and routing policies for 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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Question Discussion
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