The answer is to configure route propagation in the Transit Gateway route tables to propagate routes from the spoke attachments. This is correct because in a hub-and-spoke architecture using AWS Transit Gateway, inter-spoke traffic must be routed through the hub VPC’s Network Virtual Appliance (NVA) for inspection; without route propagation, the Transit Gateway route tables only contain static routes or default routes, causing spoke-to-spoke traffic to bypass the NVA and flow directly between attachments. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of Transit Gateway route table dynamics and the critical distinction between static routes and propagated routes—a common trap is assuming that a default route to the NVA is sufficient, but inter-spoke traffic requires specific propagated routes from each spoke attachment to force the return traffic back through the hub. Remember the memory tip: “Propagate to inspect—static routes miss the link.”
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 hub-and-spoke network architecture using AWS Transit Gateway. The hub VPC contains a central inspection appliance (NVA) for traffic inspection. Spoke VPCs are attached to the Transit Gateway and have routes pointing to the Transit Gateway for all traffic. The Transit Gateway has a default route table that routes traffic to the NVA for inspection. Recently, the network team noticed that traffic between two spoke VPCs is not being inspected. The team verified that the Transit Gateway route tables are correctly configured and that the NVA is healthy. What should the team do to ensure that inter-spoke traffic is inspected?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure route propagation in the Transit Gateway route tables to propagate routes from the spoke attachments
Option B is correct because enabling route propagation from the Transit Gateway attachments to the route tables ensures that routes are dynamically updated. Option A is wrong because static routes may cause issues if the NVA IP changes. Option C is wrong because VPC Flow Logs do not configure inspection. Option D is wrong because increasing bandwidth does not solve the inspection routing issue.
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.
✓
Configure route propagation in the Transit Gateway route tables to propagate routes from the spoke attachments
Why this is correct
Propagation ensures that spoke routes are learned and traffic is forwarded to the NVA for inspection.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable VPC Flow Logs on the spoke VPCs to capture traffic
Why it's wrong here
Flow Logs only capture logs, they do not route traffic.
✗
Add static routes in the spoke VPC route tables pointing to the NVA
Why it's wrong here
Static routes may not be dynamic and could become stale if NVA fails over.
✗
Increase the bandwidth of the Transit Gateway attachments
Why it's wrong here
Bandwidth does not affect inspection routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure route propagation in the Transit Gateway route tables to propagate routes from the spoke attachments — Option B is correct because enabling route propagation from the Transit Gateway attachments to the route tables ensures that routes are dynamically updated. Option A is wrong because static routes may cause issues if the NVA IP changes. Option C is wrong because VPC Flow Logs do not configure inspection. Option D is wrong because increasing bandwidth does not solve the inspection routing issue.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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