The answer is to create a second VPN connection to a second customer gateway device. This is correct because AWS Site-to-Site VPN supports multiple tunnels per virtual private gateway, but each tunnel requires its own unique customer gateway (CGW) resource to establish a separate BGP session. By adding a second CGW and a second VPN connection, you create a fully redundant path with an independent BGP peering, ensuring failover if the primary tunnel or on-premises router fails. On the ANS-C01 exam, this scenario tests your understanding that redundancy is achieved at the customer gateway level, not by adding tunnels to the same CGW—a common trap is assuming you can simply add another tunnel to the existing VPN connection. The virtual private gateway remains unchanged, as it can terminate multiple VPN connections simultaneously. Memory tip: think “two gateways, two tunnels, two BGP sessions” for true redundancy.
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 has an on-premises data center connected to AWS via a Site-to-Site VPN. The VPN connection uses BGP for dynamic routing. The company wants to add an additional VPN tunnel for redundancy. What must be configured?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a second VPN connection to a second customer gateway device.
Option C is correct because to add an additional VPN tunnel for redundancy, you must create a second VPN connection that uses a second customer gateway device. This provides a second BGP session and a separate tunnel, ensuring failover if the primary tunnel or customer gateway fails. The existing virtual private gateway can support multiple VPN connections, so no replacement or additional VGW is needed.
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 a second virtual private gateway and attach it to the VPC.
Create a second VPN connection to a second customer gateway device.
Why this is correct
Provides redundant tunnels.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure static routes instead of BGP.
Why it's wrong here
Static routes do not provide dynamic failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume you need a second virtual private gateway for redundancy, but AWS allows multiple VPN connections to the same VGW, so the correct approach is to add a second VPN connection with a separate customer gateway device.
Detailed technical explanation
How to think about this question
When using BGP over a Site-to-Site VPN, each VPN connection establishes a separate BGP session with the virtual private gateway. By creating a second VPN connection to a second customer gateway device, you get two independent tunnels with their own BGP sessions, allowing the VGW to learn routes from both and automatically failover if one tunnel goes down. This design leverages BGP's path selection and keepalive mechanisms (RFC 4271) to provide sub-second convergence in many cases.
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.
TExam Day Tips
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a second VPN connection to a second customer gateway device. — Option C is correct because to add an additional VPN tunnel for redundancy, you must create a second VPN connection that uses a second customer gateway device. This provides a second BGP session and a separate tunnel, ensuring failover if the primary tunnel or customer gateway fails. The existing virtual private gateway can support multiple VPN connections, so no replacement or additional VGW is needed.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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