- A
Adjust the BGP local preference on the preferred CGW to a higher value
Why wrong: Local preference is an AS-path attribute, not directly set on CGW.
- B
Remove the other CGWs from the VGW
Why wrong: This would remove redundancy.
- C
Modify the VPN tunnel option to prefer the specific tunnel
Why wrong: Tunnel options do not control routing.
- D
Configure a static route in the VPC route table pointing to the VGW with a more specific prefix for the on-premises network
Static routes take precedence over BGP routes.
Question 1,312 of 1,705
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 troubleshooting connectivity issues between an on-premises network and a VPC connected via AWS VPN CloudHub. The on-premises network uses multiple customer gateways (CGWs) connected to a single virtual private gateway (VGW). The company wants to ensure that all traffic from the VPC to on-premises is routed through a specific CGW. Which configuration should be used?
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 a static route in the VPC route table pointing to the VGW with a more specific prefix for the on-premises network
Option D is correct because in an AWS VPN CloudHub setup, the VPC route table controls how traffic from the VPC is forwarded to the on-premises network via the virtual private gateway (VGW). By adding a static route with a more specific prefix (e.g., a /24 instead of a /16) for the on-premises network, you force the VPC to prefer that route over any dynamically learned routes from other CGWs, ensuring all traffic uses the designated CGW. This approach leverages the longest prefix match rule in the VPC route table, overriding BGP-learned routes without altering the BGP configuration.
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.
- ✗
Adjust the BGP local preference on the preferred CGW to a higher value
Why it's wrong here
Local preference is an AS-path attribute, not directly set on CGW.
- ✗
Remove the other CGWs from the VGW
Why it's wrong here
This would remove redundancy.
- ✗
Modify the VPN tunnel option to prefer the specific tunnel
Why it's wrong here
Tunnel options do not control routing.
- ✓
Configure a static route in the VPC route table pointing to the VGW with a more specific prefix for the on-premises network
Why this is correct
Static routes take precedence over BGP routes.
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 often confuse BGP path selection attributes (like local preference) with VPC route table behavior, assuming they can influence outbound VPC traffic from AWS, when in fact BGP attributes only affect inbound traffic direction from on-premises to AWS.
Detailed technical explanation
How to think about this question
Under the hood, AWS VPC route tables use the longest prefix match to determine the next hop, and static routes always take precedence over BGP-propagated routes when the prefix lengths are equal or more specific. In a CloudHub topology, each CGW advertises its on-premises prefixes via BGP over the VPN tunnels, and the VGW propagates these as routes into the VPC route table. By configuring a static route with a more specific prefix (e.g., 10.0.0.0/24) than the BGP-learned route (e.g., 10.0.0.0/16), you ensure the VPC sends traffic for that subnet exclusively through the desired CGW, while other traffic still uses the BGP-learned routes.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
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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 a static route in the VPC route table pointing to the VGW with a more specific prefix for the on-premises network — Option D is correct because in an AWS VPN CloudHub setup, the VPC route table controls how traffic from the VPC is forwarded to the on-premises network via the virtual private gateway (VGW). By adding a static route with a more specific prefix (e.g., a /24 instead of a /16) for the on-premises network, you force the VPC to prefer that route over any dynamically learned routes from other CGWs, ensuring all traffic uses the designated CGW. This approach leverages the longest prefix match rule in the VPC route table, overriding BGP-learned routes without altering the BGP configuration.
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
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