This ANS-C01 practice question tests your understanding of network design. 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 is setting up a new AWS environment for a project. The network architect decides to use a hub-and-spoke model with a central inspection VPC for east-west traffic inspection. The inspection VPC (VPC-Hub) contains a firewall appliance that inspects traffic between spoke VPCs. All VPCs are attached to an AWS Transit Gateway. The architect creates a route table in the Transit Gateway for the inspection VPC and another route table for the spoke VPCs. The inspection VPC route table has a default route (0.0.0.0/0) pointing to the firewall appliance. The spoke VPCs have route tables that point to the inspection VPC for traffic to other spoke VPCs. The firewall appliance is configured to forward traffic after inspection. However, traffic between spoke VPCs is not being routed through the inspection VPC. Which configuration change should the architect make to ensure traffic between spoke VPCs is inspected?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable route propagation on the inspection VPC attachment for the inspection route table
Option D is correct because the inspection VPC route table needs to learn the spoke VPC CIDRs dynamically via route propagation from the Transit Gateway attachment. Without propagation, the inspection VPC route table only has a default route pointing to the firewall appliance, but no specific routes for the spoke VPCs. When the firewall appliance forwards traffic after inspection, it needs to know how to reach the destination spoke VPC; enabling route propagation on the inspection VPC attachment for the inspection route table allows the Transit Gateway to inject the spoke VPC routes into that route table, enabling proper return traffic flow.
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.
✗
Use VPC Peering between the spoke VPCs instead of Transit Gateway
Why it's wrong here
Incorrect; VPC Peering would bypass inspection.
✗
Create a static route in the inspection VPC route table for each spoke VPC CIDR
Why it's wrong here
Incorrect; this would be manual and not scalable; route propagation is better.
✗
Remove the default route from the spoke VPC route tables
Why it's wrong here
Incorrect; the default route is needed for other traffic.
✓
Enable route propagation on the inspection VPC attachment for the inspection route table
Why this is correct
Correct; propagation allows the inspection VPC to learn the spoke CIDRs.
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 focus on the spoke VPC route tables (thinking they need to remove the default route or add static routes) instead of recognizing that the inspection VPC route table must have routes to the spoke VPCs via route propagation to allow the firewall to forward inspected traffic back to the Transit Gateway.
Detailed technical explanation
How to think about this question
In a Transit Gateway hub-and-spoke model with central inspection, the inspection VPC attachment must be associated with a route table that has route propagation enabled to receive the spoke VPC CIDRs. The firewall appliance in the inspection VPC acts as a next hop for inter-spoke traffic; after inspection, it forwards the packet back to the Transit Gateway via the attachment, which then uses the propagated routes to deliver the packet to the correct spoke VPC. Without propagation, the inspection VPC route table only has the default route, causing the firewall to send inspected traffic back to the Transit Gateway with no specific route for the destination spoke, resulting in a routing loop or black hole.
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.
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: Enable route propagation on the inspection VPC attachment for the inspection route table — Option D is correct because the inspection VPC route table needs to learn the spoke VPC CIDRs dynamically via route propagation from the Transit Gateway attachment. Without propagation, the inspection VPC route table only has a default route pointing to the firewall appliance, but no specific routes for the spoke VPCs. When the firewall appliance forwards traffic after inspection, it needs to know how to reach the destination spoke VPC; enabling route propagation on the inspection VPC attachment for the inspection route table allows the Transit Gateway to inject the spoke VPC routes into that route table, enabling proper return traffic flow.
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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