- A
Create VPC peering connections between all VPCs and route traffic through the inspection VPC.
Why wrong: VPC peering does not support transitive routing; all VPCs would need to be directly peered with the inspection VPC and route tables set up, which is less efficient.
- B
Use AWS PrivateLink to route traffic through the inspection VPC.
Why wrong: PrivateLink is used for accessing services across VPCs, not for traffic inspection.
- C
Configure Transit Gateway route tables with a blackhole route for the inter-VPC traffic and a route pointing to the inspection VPC.
This allows traffic between VPCs to be forced through the inspection VPC for firewall inspection.
- D
Attach a Network Load Balancer in each VPC and route traffic through it.
Why wrong: NLB does not provide traffic inspection capabilities.
Quick Answer
The answer is to configure Transit Gateway route tables with a blackhole route for inter-VPC traffic and a route pointing to the inspection VPC. This works because Transit Gateway route tables allow you to explicitly control traffic flow between attachments; by creating a blackhole entry for the destination VPC CIDRs, you prevent direct communication, and then a more specific route directs that traffic to the inspection VPC attachment, forcing all inter-VPC traffic through the third-party firewall. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of centralized inspection architectures and the transitive routing limitations of VPC peering—a common trap is assuming a Network Load Balancer or PrivateLink can handle inspection, but they lack the packet-level forwarding needed for stateful firewalls. Remember the key insight: blackhole routes act as a deliberate “no direct path,” forcing traffic through the inspection appliance, much like a security checkpoint at an airport where all passengers must pass through a single gate.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 is using AWS Transit Gateway to connect multiple VPCs. The security team wants to inspect all traffic between VPCs with a third-party firewall appliance deployed in a centralized inspection VPC. What is the MOST efficient way to route traffic to the inspection VPC?
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
Configure Transit Gateway route tables with a blackhole route for the inter-VPC traffic and a route pointing to the inspection VPC.
Option B is correct because Transit Gateway route tables can be used to steer inter-VPC traffic to the inspection VPC via a central appliance. Option A is wrong because VPC peering does not support transitive routing. Option C is wrong because Network Load Balancer is not needed for traffic inspection. Option D is wrong because PrivateLink does not support traffic inspection.
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.
- ✗
Create VPC peering connections between all VPCs and route traffic through the inspection VPC.
Why it's wrong here
VPC peering does not support transitive routing; all VPCs would need to be directly peered with the inspection VPC and route tables set up, which is less efficient.
- ✗
Use AWS PrivateLink to route traffic through the inspection VPC.
Why it's wrong here
PrivateLink is used for accessing services across VPCs, not for traffic inspection.
- ✓
Configure Transit Gateway route tables with a blackhole route for the inter-VPC traffic and a route pointing to the inspection VPC.
Why this is correct
This allows traffic between VPCs to be forced through the inspection VPC for firewall inspection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Attach a Network Load Balancer in each VPC and route traffic through it.
Why it's wrong here
NLB does not provide traffic inspection capabilities.
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.
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Network Security, Compliance and Governance — study guide chapter
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
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: Configure Transit Gateway route tables with a blackhole route for the inter-VPC traffic and a route pointing to the inspection VPC. — Option B is correct because Transit Gateway route tables can be used to steer inter-VPC traffic to the inspection VPC via a central appliance. Option A is wrong because VPC peering does not support transitive routing. Option C is wrong because Network Load Balancer is not needed for traffic inspection. Option D is wrong because PrivateLink does not support traffic inspection.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company has a hybrid network with an AWS Transit Gateway connecting multiple VPCs and an on-premises data center via AWS Direct Connect. The security team requires that all traffic between VPCs must be inspected by a centralized firewall appliance deployed in a security VPC. They have configured a Transit Gateway with a route table that has blackhole routes for all VPC CIDRs except the security VPC, and the security VPC appliance performs inspection and returns traffic to the Transit Gateway. Recently, they added a new VPC for a critical application. After configuration, some traffic from the new VPC to other VPCs is being dropped. The network engineer verifies that the Transit Gateway route table includes a blackhole route for the new VPC's CIDR and that the security VPC's firewall rules allow the traffic. What is the most likely cause of the dropped traffic?
hard- A.The security VPC's network ACLs are blocking return traffic from the firewall appliance back to the Transit Gateway.
- B.The new VPC's route table does not have a default route pointing to the Transit Gateway attachment.
- C.The Transit Gateway route table propagates the new VPC's CIDR, overriding the static blackhole route.
- ✓ D.The Transit Gateway route table does not have a static route pointing to the security VPC attachment for the new VPC's CIDR.
Last reviewed: Jun 20, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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