The answer is two tunnels per VPN connection, a second customer gateway device on-premises, and BGP dynamic routing. These three components work together to ensure high availability for an AWS Site-to-Site VPN: the two tunnels provide redundant paths across separate Availability Zones, the second customer gateway device eliminates a single point of failure on the on-premises side, and BGP enables automatic failover between tunnels by exchanging route advertisements. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of the fundamental HA architecture for hybrid connectivity, often appearing as a trap where candidates mistakenly think a single VPN connection with one tunnel is sufficient or that static routes can handle failover. The key insight is that AWS guarantees high availability only when both the cloud side (dual tunnels) and the on-premises side (dual CGWs) are redundant, with dynamic routing to react to failures. Memory tip: think "Two of Everything" — two tunnels, two CGWs, and BGP to glue them together.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 AWS Site-to-Site VPN for connectivity between its on-premises network and AWS VPC. They want to ensure the VPN tunnel is highly available. Which THREE components should be configured? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
BGP dynamic routing over the VPN tunnels
Options A, C, and D are correct. Option A: Two tunnels per VPN connection provide redundancy. Option C: A second customer gateway device ensures on-premises redundancy. Option D: BGP dynamic routing allows automatic failover. Option B is incorrect because a single VPN connection with one tunnel is not highly available. Option E is incorrect because static routes do not provide dynamic failover.
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.
✗
A single VPN connection with one tunnel
Why it's wrong here
Incorrect; one tunnel is a single point of failure.
✓
BGP dynamic routing over the VPN tunnels
Why this is correct
Correct; BGP allows automatic failover between tunnels.
Related concept
Read the scenario before looking for a memorised answer.
✗
Static routing instead of BGP
Why it's wrong here
Incorrect; static routes do not provide automatic failover.
✓
Two VPN tunnels per VPN connection
Why this is correct
Correct; each VPN connection has two tunnels by default.
Related concept
Read the scenario before looking for a memorised answer.
✓
A second customer gateway device on-premises
Why this is correct
Correct; redundancy at the customer side.
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: BGP dynamic routing over the VPN tunnels — Options A, C, and D are correct. Option A: Two tunnels per VPN connection provide redundancy. Option C: A second customer gateway device ensures on-premises redundancy. Option D: BGP dynamic routing allows automatic failover. Option B is incorrect because a single VPN connection with one tunnel is not highly available. Option E is incorrect because static routes do not provide dynamic failover.
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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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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