This ANS-C01 practice question tests your understanding of network design. 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 designing a multi-VPC architecture with VPC peering. They need to ensure that traffic between VPCs in different AWS Regions is encrypted. Which solution should they use?
Direct Connect gateway with VIFs
Why wrong: Direct Connect is for on-premises, not VPC-to-VPC.
Transit Gateway VPN attachments
Why wrong: VPN attachments are for on-premises connectivity.
VPC peering with VPN encryption
Why wrong: VPC peering does not support inter-Region peering.
Transit Gateway inter-Region peering
Transit Gateway inter-Region peering encrypts traffic automatically.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Transit Gateway inter-Region peering
Transit Gateway inter-Region peering is the correct solution because it provides encrypted traffic between VPCs in different AWS Regions natively, using the AWS global network infrastructure with automatic encryption at the transport layer. This feature supports transitive routing and does not require additional VPN tunnels or third-party appliances, making it the most efficient and scalable option for multi-region VPC connectivity.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Direct Connect gateway with VIFs
Why it's wrong here
Direct Connect is for on-premises, not VPC-to-VPC.
Transit Gateway VPN attachments
Why it's wrong here
VPN attachments are for on-premises connectivity.
VPC peering with VPN encryption
Why it's wrong here
VPC peering does not support inter-Region peering.
Transit Gateway inter-Region peering
Why this is correct
Transit Gateway inter-Region peering encrypts traffic automatically.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
AWS often tests the misconception that VPC peering alone provides encryption, or that VPN attachments are required for inter-Region encryption, when in fact Transit Gateway inter-Region peering natively encrypts traffic without additional VPN layers.
Detailed technical explanation
Transit Gateway inter-Region peering leverages the AWS global backbone, which provides automatic encryption for data in transit between peered Transit Gateways across Regions, using the same encryption standards as AWS inter-Region traffic (e.g., AES-256). This feature supports up to 50 Gbps per peering attachment and allows transitive routing across multiple VPCs and VPNs, enabling hub-and-spoke or mesh architectures without the need for individual VPC peering connections. In real-world scenarios, this is critical for disaster recovery or active-active workloads where low-latency, encrypted cross-Region communication is required.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
The correct answer is: Transit Gateway inter-Region peering — Transit Gateway inter-Region peering is the correct solution because it provides encrypted traffic between VPCs in different AWS Regions natively, using the AWS global network infrastructure with automatic encryption at the transport layer. This feature supports transitive routing and does not require additional VPN tunnels or third-party appliances, making it the most efficient and scalable option for multi-region VPC connectivity.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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