The answer is to enable route propagation on the VPC route table for the virtual private gateway, use two customer gateway devices, and configure BGP on both VPN tunnels. This combination works because BGP dynamically exchanges route prefixes between the on-premises network and AWS, allowing the virtual private gateway to automatically withdraw the failed tunnel’s routes and install the healthy tunnel’s routes without manual intervention. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how BGP-based dynamic routing provides automatic VPN failover, as opposed to static routes which require manual updates and cannot react to tunnel loss. A common trap is assuming a single customer gateway device with two tunnels is sufficient—this creates a single point of failure at the physical gateway. Remember the memory tip: “BGP brings automatic path selection; two gateways break the connection reflection.”
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 setting up a site-to-site VPN connection between an on-premises network and AWS. The VPN uses two tunnels for high availability. The network engineer needs to ensure that if one tunnel goes down, traffic automatically fails over to the other tunnel. Which THREE steps should the engineer perform? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure BGP on both VPN tunnels.
Options A, B, and D are correct. Using BGP allows dynamic routing and failover. Two customer gateway devices provide physical redundancy. Enabling route propagation on the VPC route table ensures BGP routes are added. Option C is wrong because static routes do not provide automatic failover. Option E is wrong because a single customer gateway device is a single point of failure.
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.
✗
Configure static routes pointing to the VPN connection.
Why it's wrong here
Static routes require manual intervention for failover.
Read the scenario before looking for a memorised answer.
✗
Use a single customer gateway device with multiple BGP sessions.
Why it's wrong here
A single device is a single point of failure.
✓
Configure two customer gateway devices on-premises, each with a separate BGP session.
Why this is correct
Redundant devices ensure availability.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable route propagation on the VPC route table for the virtual private gateway.
Why this is correct
This allows BGP routes to be automatically added and removed.
Related concept
Read the scenario before looking for a memorised answer.
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
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 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.
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure BGP on both VPN tunnels. — Options A, B, and D are correct. Using BGP allows dynamic routing and failover. Two customer gateway devices provide physical redundancy. Enabling route propagation on the VPC route table ensures BGP routes are added. Option C is wrong because static routes do not provide automatic failover. Option E is wrong because a single customer gateway device is a single point of failure.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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