- A
Set a higher BGP local preference on the VPN routes compared to Direct Connect routes for the same prefix.
Higher local preference is preferred.
- B
Advertise a more specific route for 10.0.1.0/24 over the VPN BGP session.
More specific routes are preferred over less specific routes.
- C
Disable route propagation on the VPN connection's route table.
Why wrong: This would remove the VPN routes entirely.
- D
Prepend the AS path on the Direct Connect BGP advertisement for the 10.0.1.0/24 prefix to make it less preferred.
Longer AS path is less preferred.
- E
Delete the VPN connection and rely solely on Direct Connect.
Why wrong: The requirement is to use VPN for the specific subnet.
Question 1,530 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 has a VPC with a CIDR of 10.0.0.0/16 and needs to connect to an on-premises network using AWS Direct Connect and a Site-to-Site VPN. The on-premises network advertises 10.0.0.0/8 over BGP. The company wants to ensure that traffic to the VPC's specific subnet 10.0.1.0/24 is routed via the VPN, while all other traffic to 10.0.0.0/8 uses Direct Connect. Which THREE actions should the network engineer take?
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
✓
Set a higher BGP local preference on the VPN routes compared to Direct Connect routes for the same prefix.
Option A is correct because setting a higher BGP local preference on the VPN routes makes them more preferred over Direct Connect routes for the same prefix. Since the on-premises network advertises 10.0.0.0/8 over both connections, BGP local preference is the first tiebreaker; a higher value on the VPN side ensures that traffic to 10.0.1.0/24 uses the VPN as desired.
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.
- ✓
Set a higher BGP local preference on the VPN routes compared to Direct Connect routes for the same prefix.
Why this is correct
Higher local preference is preferred.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Advertise a more specific route for 10.0.1.0/24 over the VPN BGP session.
Why this is correct
More specific routes are preferred over less specific routes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disable route propagation on the VPN connection's route table.
Why it's wrong here
This would remove the VPN routes entirely.
- ✓
Prepend the AS path on the Direct Connect BGP advertisement for the 10.0.1.0/24 prefix to make it less preferred.
Why this is correct
Longer AS path is less preferred.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Delete the VPN connection and rely solely on Direct Connect.
Why it's wrong here
The requirement is to use VPN for the specific subnet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think AS path prepending alone is sufficient to influence route preference, but they forget that local preference is evaluated before AS path length in BGP path selection, and that a more specific prefix advertisement (10.0.1.0/24) will always be preferred over a less specific one (10.0.0.0/8) regardless of BGP attributes.
Detailed technical explanation
How to think about this question
BGP local preference is an attribute that influences outbound traffic from the local AS; it is exchanged only within the AS and has a default value of 100. By setting a higher local preference (e.g., 150) on the VPN BGP session for the 10.0.0.0/8 prefix, the VPC router will prefer the VPN path for traffic matching that prefix, but because a more specific route (10.0.1.0/24) is advertised over the VPN, the VPC will use longest-prefix match to send traffic to that subnet via the VPN, while all other 10.0.0.0/8 traffic uses Direct Connect due to the lower local preference.
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.
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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: Set a higher BGP local preference on the VPN routes compared to Direct Connect routes for the same prefix. — Option A is correct because setting a higher BGP local preference on the VPN routes makes them more preferred over Direct Connect routes for the same prefix. Since the on-premises network advertises 10.0.0.0/8 over both connections, BGP local preference is the first tiebreaker; a higher value on the VPN side ensures that traffic to 10.0.1.0/24 uses the VPN as desired.
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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