- A
Set up a Site-to-Site VPN connection between on-premises and each VPC using a VPN appliance on AWS.
Why wrong: Wrong: VPN over internet cannot guarantee sub-second failover.
- B
Order an AWS Direct Connect connection and create multiple virtual interfaces, each connecting to a different VPC in different regions. Use BGP with Bidirectional Forwarding Detection (BFD) for fast failover.
Correct: Direct Connect provides stable latency, and BFD enables sub-second failover.
- C
Use AWS Transit Gateway with inter-region peering and attach VPN connections from on-premises to a central Transit Gateway.
Why wrong: Wrong: Transit Gateway inter-region peering does not support on-premises connections.
- D
Use a combination of Direct Connect and VPN as a backup, and route all traffic through a single VPC that acts as a transit hub.
Why wrong: Wrong: Single point of failure and does not scale.
Quick Answer
The correct answer is to order an AWS Direct Connect connection and create multiple virtual interfaces, each connecting to a different VPC in different regions, using BGP with Bidirectional Forwarding Detection (BFD) for fast failover. This design meets the requirements because Direct Connect provides a dedicated, low-latency path for multi-region on-premises to multiple VPCs Direct Connect traffic, while separate virtual interfaces enforce traffic segmentation between VPCs. BFD enables sub-second failover by rapidly detecting link failures, far faster than standard BGP keepalives. On the ANS-C01 exam, this scenario tests your understanding of how to extend on-premises connectivity across regions without relying on VPNs or Transit Gateway inter-region peering, which are either too slow or designed for VPC-to-VPC traffic. A common trap is assuming Transit Gateway is always the answer, but here it adds unnecessary cost and complexity. Memory tip: think “VIF per VPC, BFD for fast” to recall that each VPC gets its own virtual interface and BFD handles the sub-second failover.
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 is migrating to AWS and needs to connect its on-premises data center to multiple VPCs across several AWS regions. The on-premises network uses BGP and requires high availability with sub-second failover. The solution must be cost-effective and support traffic segmentation. Which design meets these requirements?
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
Order an AWS Direct Connect connection and create multiple virtual interfaces, each connecting to a different VPC in different regions. Use BGP with Bidirectional Forwarding Detection (BFD) for fast failover.
Option C is correct because Direct Connect with multiple virtual interfaces (one per VPC) provides segmentation, and BGP fast failover can be achieved. Option A is wrong because VPN over the internet cannot guarantee sub-second failover. Option B is wrong because Transit Gateway inter-region peering is for VPC-to-VPC, not on-premises. Option D is wrong because it adds unnecessary complexity and cost.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set up a Site-to-Site VPN connection between on-premises and each VPC using a VPN appliance on AWS.
Why it's wrong here
Wrong: VPN over internet cannot guarantee sub-second failover.
- ✓
Order an AWS Direct Connect connection and create multiple virtual interfaces, each connecting to a different VPC in different regions. Use BGP with Bidirectional Forwarding Detection (BFD) for fast failover.
Why this is correct
Correct: Direct Connect provides stable latency, and BFD enables sub-second failover.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Use AWS Transit Gateway with inter-region peering and attach VPN connections from on-premises to a central Transit Gateway.
Why it's wrong here
Wrong: Transit Gateway inter-region peering does not support on-premises connections.
- ✗
Use a combination of Direct Connect and VPN as a backup, and route all traffic through a single VPC that acts as a transit hub.
Why it's wrong here
Wrong: Single point of failure and does not scale.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
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
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Order an AWS Direct Connect connection and create multiple virtual interfaces, each connecting to a different VPC in different regions. Use BGP with Bidirectional Forwarding Detection (BFD) for fast failover. — Option C is correct because Direct Connect with multiple virtual interfaces (one per VPC) provides segmentation, and BGP fast failover can be achieved. Option A is wrong because VPN over the internet cannot guarantee sub-second failover. Option B is wrong because Transit Gateway inter-region peering is for VPC-to-VPC, not on-premises. Option D is wrong because it adds unnecessary complexity and cost.
What should I do if I get this ANS-C01 question wrong?
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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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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