Quick Answer
The answer is AWS Transit Gateway with inter-Region peering attachments. This service acts as a central hub that simplifies routing by providing a single point of attachment for your on-premises router, which uses BGP to advertise routes into the Transit Gateway, while inter-Region peering extends that connectivity across multiple AWS Regions without requiring complex VPC peering meshes. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of hub-and-spoke architectures versus point-to-point solutions; a common trap is choosing VPC peering for multi-region needs, but remember that VPC peering is non-transitive and lacks a central routing point, whereas Transit Gateway natively supports transitive routing and BGP. Memory tip: think “Transit Gateway = the global router hub” — it’s the only service that combines multi-VPC, multi-region, and on-premises BGP into one managed attachment.
This ANS-C01 practice question tests your understanding of network implementation. 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.
An organization needs to securely connect its on-premises data center to multiple VPCs in different AWS Regions. The on-premises network uses BGP. Which AWS service should be used to simplify routing and provide a single point of attachment for the on-premises router?
Direct Connect gateway with a private VIF.
Why wrong: Single region only.
AWS Transit Gateway with inter-Region peering attachments.
Centralized hub with BGP and multi-region support.
VPC Peering connections between each VPC and the on-premises network.
Why wrong: Does not scale; requires multiple connections.
AWS Client VPN endpoint.
Why wrong: Not for site-to-site connectivity.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Transit Gateway with inter-Region peering attachments.
Option C is correct because Transit Gateway provides a hub for multi-VPC and on-premises connectivity with BGP support. Option A is wrong because VPC peering is point-to-point, not hub. Option B is wrong because Direct Connect gateway doesn't connect multiple regions natively. Option D is wrong because Client VPN is for individual users.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Direct Connect gateway with a private VIF.
Why it's wrong here
Single region only.
AWS Transit Gateway with inter-Region peering attachments.
VPC Peering connections between each VPC and the on-premises network.
Why it's wrong here
Does not scale; requires multiple connections.
AWS Client VPN endpoint.
Why it's wrong here
Not for site-to-site connectivity.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
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FAQ
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
The correct answer is: AWS Transit Gateway with inter-Region peering attachments. — Option C is correct because Transit Gateway provides a hub for multi-VPC and on-premises connectivity with BGP support. Option A is wrong because VPC peering is point-to-point, not hub. Option B is wrong because Direct Connect gateway doesn't connect multiple regions natively. Option D is wrong because Client VPN is for individual users.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Same concept, more angles
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Variation 1. A company wants to securely connect their on-premises data center to AWS using a site-to-site VPN. They have multiple branch offices that also need to connect to AWS. Which AWS service should they use to simplify the management of multiple VPN connections?
easyWhy C: AWS Transit Gateway acts as a hub for connecting multiple VPCs and on-premises networks, simplifying the management of multiple VPN connections. Option A (Direct Connect) is a dedicated connection but not ideal for multiple branch offices. Option B (VPC Peering) is for VPC-to-VPC connections. Option D (VPN CloudHub) is a feature of Virtual Private Gateway but is less scalable than Transit Gateway.
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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