ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 uses AWS Transit Gateway to connect multiple VPCs and on-premises networks. They have a security requirement that all traffic between VPCs must be inspected by a third-party firewall deployed in a central inspection VPC. The Transit Gateway has route tables configured with blackhole routes for inter-VPC traffic, and the inspection VPC has the firewall. However, traffic is not being inspected; it is being dropped. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Transit Gateway route table for inter-VPC traffic has blackhole routes instead of pointing to the inspection VPC attachment.
Option D is correct because if the Transit Gateway route table has blackhole routes for inter-VPC traffic, that traffic is dropped before reaching the inspection VPC. The route table should direct traffic to the inspection VPC attachment, not blackhole. Option A is wrong because firewall configuration is not the issue if traffic is not reaching it. Option B is wrong because static routes are fine. Option C is wrong because propagation is not the 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.
✗
The inspection VPC is not propagating its routes to the Transit Gateway.
Why it's wrong here
Wrong: Propagation is not the issue.
✗
The firewall appliance is not configured to forward traffic back to the Transit Gateway.
The Transit Gateway route tables do not have static routes for the inspection VPC.
Why it's wrong here
Wrong: They have routes, but blackhole.
✓
The Transit Gateway route table for inter-VPC traffic has blackhole routes instead of pointing to the inspection VPC attachment.
Why this is correct
Correct: Blackhole routes drop traffic.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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 Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Transit Gateway route table for inter-VPC traffic has blackhole routes instead of pointing to the inspection VPC attachment. — Option D is correct because if the Transit Gateway route table has blackhole routes for inter-VPC traffic, that traffic is dropped before reaching the inspection VPC. The route table should direct traffic to the inspection VPC attachment, not blackhole. Option A is wrong because firewall configuration is not the issue if traffic is not reaching it. Option B is wrong because static routes are fine. Option C is wrong because propagation is not the 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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