The correct answer is to advertise the same BGP prefixes over both tunnels from the on-premises router. This works because BGP load balancing relies on equal-cost multipath routing; when the same routes are advertised with equal metrics across both VPN tunnels, AWS can install both paths into the routing table and distribute traffic actively across both tunnels. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of active/active VPN design versus active/passive failover, a common trap being that engineers mistakenly think static routes or different AS numbers will solve the imbalance. The key insight is that AWS VPN supports active/active mode only when the customer gateway device advertises identical prefixes over each BGP session, forcing equal-cost multipathing. A simple memory tip: same prefixes, same AS, equal cost — both tunnels must be equal in BGP’s eyes to share the load.
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 has a VPN connection between an on-premises network and AWS using two tunnels for redundancy. The BGP sessions are established, but traffic is only flowing through one tunnel. The engineer wants to ensure both tunnels are actively used. What should be configured?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Advertise the same BGP prefixes over both tunnels from the on-premises router.
Option D is correct because BGP supports load balancing by advertising the same prefixes from both tunnels. AWS VPN supports active/active mode if the customer gateway device is configured to advertise the same BGP routes over both tunnels. Option A is incorrect because static routes do not provide automatic failover. Option B is incorrect because different ASNs would break BGP. Option C is incorrect because the VPN connection itself does not have a load balancer.
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.
✗
Enable load balancing on the VPN connection in the AWS console.
Why it's wrong here
AWS VPN does not have a load balancing option; load balancing is achieved via BGP.
✗
Configure static routes for the second tunnel.
Why it's wrong here
Static routes would not allow dynamic load balancing; BGP is already in use.
✗
Assign different BGP ASNs to each tunnel.
Why it's wrong here
Both tunnels should use the same ASN for the customer gateway.
✓
Advertise the same BGP prefixes over both tunnels from the on-premises router.
Why this is correct
This allows AWS to load balance traffic across both tunnels.
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: Advertise the same BGP prefixes over both tunnels from the on-premises router. — Option D is correct because BGP supports load balancing by advertising the same prefixes from both tunnels. AWS VPN supports active/active mode if the customer gateway device is configured to advertise the same BGP routes over both tunnels. Option A is incorrect because static routes do not provide automatic failover. Option B is incorrect because different ASNs would break BGP. Option C is incorrect because the VPN connection itself does not have a load balancer.
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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