- A
Configure BGP AS_PATH prepending on the preferred VPN connection to make it less preferred
AS_PATH prepending can make one path appear longer.
- B
Enable equal-cost multi-path (ECMP) routing on the Transit Gateway route table
ECMP enables load balancing across equal-cost routes.
- C
Set a higher BGP weight on the less preferred connection
Why wrong: Weight is Cisco proprietary and not supported on AWS VPN.
- D
Use static routes for both VPN connections instead of BGP
Why wrong: Static routes do not support ECMP or dynamic load balancing.
- E
Adjust the BGP Multi-Exit Discriminator (MED) attribute on the on-premises routers
MED influences inbound traffic path selection.
Question 135 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 uses AWS Transit Gateway with multiple VPC attachments and a VPN attachment to an on-premises network. The on-premises network advertises the same prefix via two separate VPN connections for redundancy. The TGW route table shows both routes as active. Traffic from a VPC to on-premises is not load-balanced and prefers one connection. Which THREE actions would help achieve active-active load balancing? (Choose 3.)
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
✓
Configure BGP AS_PATH prepending on the preferred VPN connection to make it less preferred
Option A is correct because BGP AS_PATH prepending artificially increases the AS path length for routes advertised over the preferred VPN connection, making them less preferred by BGP's path selection algorithm. This causes the Transit Gateway to prefer the other VPN connection for those prefixes, enabling active-active load balancing when combined with ECMP.
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 BGP AS_PATH prepending on the preferred VPN connection to make it less preferred
Why this is correct
AS_PATH prepending can make one path appear longer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Enable equal-cost multi-path (ECMP) routing on the Transit Gateway route table
Why this is correct
ECMP enables load balancing across equal-cost routes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set a higher BGP weight on the less preferred connection
Why it's wrong here
Weight is Cisco proprietary and not supported on AWS VPN.
- ✗
Use static routes for both VPN connections instead of BGP
Why it's wrong here
Static routes do not support ECMP or dynamic load balancing.
- ✓
Adjust the BGP Multi-Exit Discriminator (MED) attribute on the on-premises routers
Why this is correct
MED influences inbound traffic path selection.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume BGP weight (a Cisco-proprietary attribute) can be used on AWS Transit Gateway, but AWS only supports standard BGP attributes and does not implement weight, making option C a distractor.
Detailed technical explanation
How to think about this question
AWS Transit Gateway supports equal-cost multi-path (ECMP) routing only when multiple routes to the same destination have identical BGP path attributes (AS path length, MED, local preference, etc.). By prepending AS_PATH on one connection, you make its path longer, so BGP selects the other connection as best; with ECMP enabled, both routes must have equal AS path length to be used simultaneously. In real-world scenarios, on-premises routers often use BGP MED to influence inbound traffic, but MED is only compared between paths from the same neighboring AS, so AS_PATH prepending is a more reliable method for multi-homed setups.
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
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.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
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 AS_PATH prepending on the preferred VPN connection to make it less preferred — Option A is correct because BGP AS_PATH prepending artificially increases the AS path length for routes advertised over the preferred VPN connection, making them less preferred by BGP's path selection algorithm. This causes the Transit Gateway to prefer the other VPN connection for those prefixes, enabling active-active load balancing when combined with ECMP.
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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Last reviewed: Jul 4, 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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