- A
Use a transit VPC architecture with EC2-based VPN appliances in a security VPC that encrypt traffic between VPCs.
EC2 VPN appliances (e.g., using IPsec) can be deployed in a security VPC to encrypt traffic between VPCs. Traffic is routed through the Transit Gateway to the security VPC, then encrypted and forwarded.
- B
Enable Transit Gateway VPN attachments between each VPC and the Transit Gateway with IPsec VPN.
Why wrong: VPN attachments are for connecting external networks, not VPCs. VPC attachments to Transit Gateway do not support encryption natively.
- C
Use AWS Network Firewall to inspect and encrypt traffic between VPCs.
Why wrong: Network Firewall does not provide encryption; it provides stateful inspection.
- D
Implement VPC peering with encryption enabled.
Why wrong: VPC peering does not provide encryption; traffic is within AWS backbone and not encrypted by default.
Quick Answer
The answer is to use a transit VPC architecture with EC2-based VPN appliances in a security VPC that encrypt traffic between VPCs. This is correct because AWS Transit Gateway itself does not natively encrypt traffic between attached VPCs; it only provides network transit and routing. By routing inter-VPC traffic through a dedicated security VPC running software VPN appliances (such as those from Cisco, Palo Alto, or open-source IPsec solutions), you can enforce encryption at the application layer while keeping existing VPC route tables largely unchanged—you simply point default or specific routes toward the Transit Gateway, which then forwards traffic to the security VPC. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of the limitations of native AWS encryption options and your ability to design hybrid solutions that meet compliance requirements without disrupting existing architectures. A common trap is assuming that Transit Gateway supports native encryption between VPC attachments, but it does not—only AWS Direct Connect or Site-to-Site VPN offer native encryption, and those are for on-premises connections. Memory tip: “Transit Gateway routes, it doesn’t encrypt—use a security VPC as your encryption hub.”
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 interconnect multiple VPCs and on-premises networks. They need to ensure that traffic between VPCs is encrypted in transit. They also want to minimize changes to existing VPC route tables. Which solution should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Use a transit VPC architecture with EC2-based VPN appliances in a security VPC that encrypt traffic between VPCs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
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 a transit VPC architecture with EC2-based VPN appliances in a security VPC that encrypt traffic between VPCs.
Why this is correct
EC2 VPN appliances (e.g., using IPsec) can be deployed in a security VPC to encrypt traffic between VPCs. Traffic is routed through the Transit Gateway to the security VPC, then encrypted and forwarded.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable Transit Gateway VPN attachments between each VPC and the Transit Gateway with IPsec VPN.
- ✗
Use AWS Network Firewall to inspect and encrypt traffic between VPCs.
Why it's wrong here
Network Firewall does not provide encryption; it provides stateful inspection.
- ✗
Implement VPC peering with encryption enabled.
Why it's wrong here
VPC peering does not provide encryption; traffic is within AWS backbone and not encrypted by default.
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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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: Use a transit VPC architecture with EC2-based VPN appliances in a security VPC that encrypt traffic between VPCs.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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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